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Supplemental Restraint System

1. TRAINING MANUAL CT L1003 Supplemental Restraint System 9 PAN No part of this hardcopy may be reproduced in any form without prior permission of Mazda Motor Europe GmbH The illustrations technical information data and descriptive text in this issue to the best of our knowledge were correct at the time of going to print No liability can be accepted for any inaccuracies or omissions in this publication although every possible care has been taken to make it as complete and accurate as possible TRAINING 2005 SERVICES Mazda Motor Europe GmbH Training Services ome Suppl Restraint System Table of Contents IntrodueUOm ss aguna EE RR RE ADA orem N ER ees ERE 00 1 OVER VLC ER EE S 01 1 Fundamentals as ee ee ee ee e ral Ee ated 01 1 Paris LO CANON de aan die aaa aid ina dg d a E aa eee 01 2 Directives for Working on SRS c nenea nea aaana 01 3 COMpPONENIS i anaa rete at aaa ec aa ba naa eae ade 02 1 SAS Mod le ssa RR Rte ny RD 0 iat convent icon lars 02 1 SRS arie EOE saa ea os ends Sa Ata ca uid De a aus suds Nga gata aa na acdc tude A Aa 02 3 Crash Zone SEISOEN Da EE Nga ii Da e E 02 5 Side Airbag Sensors nise aice apar ada apa dog SR GR ad Ge Se pa 02 7 Clock SPUN EE RE ES EE AG a inta oaia tai ie 02 10 Buckle SWit hisss estes cette cee etter cede a ei i iti ti debate ad dee i 02 11 Seat Track Position Sensor Sarda sas See tet Ceca ines ies Uae dace tated a dai nes 02 11 Drive
2. Repeat the past malfunction inspection procedure to ensure that all past malfunctions are deleted Turn the ignition switch to LOCK position Disconnect the jumper wire from the DLC If the SRS warning light does not illuminate or remains illuminated when the ignition switch is turned to the ON position inspect the control circuit of the SRS warning light OBD of the 37 SRS Generation The OBD system of the 3 SRS generation comprises the following features Malfunction detection function Display function to indicate present malfunctions as two digit DTCs via the SRS warning light DTC memory function for present and past malfunctions Diagnosis via DLC 2 and WDS PID monitor function to access certain data such as input signals calculated values and system status information Fail safe function to prevent the accidental activation of SRS components in case of an air bag system malfunction The OBD system is used for the SRS installed in the following vehicles 04 4 Mazda DY Mazda3 BK Mazda6 GG GY Tribute EP and RX 8 SE Curriculum Training Suppl Restraint System Diagnosis and Repair Present and Past Malfunctions e When the OBD system has detected a malfunction and the ignition is switched on the SRS warning light outputs the present malfunction as a two digit DTC by a corresponding flashing pattern for a certain period of time and then illuminates permanently e To read out or delete present or
3. Suppl Restraint System Components Crash Zone Sensor e Notall vehicles are equipped with a crash zone sensor but it is mandatory if the vehicle is equipped with dual stage airbags It is mounted at the front of the vehicle to determine type direction and severity of a frontal impact as early as possible Furthermore its signal helps the SAS module to distinguish between crash and non crash events Thus it prevents the SRS components from being triggered when the vehicle touches bumps curbs etc while driving e It incorporates an accelerometer and is connected to the SAS module NOTE The bolt s of the crash zone sensor must always be tightened to the specified torque refer to W M Ensure that the sensor is correctly aligned otherwise the measurement results for the acceleration might be affected causing a malfunction of the SRS 1003 108 1 Bolt 3 Connector 2 Cover 4 Crash zone sensor Curriculum Training 02 5 Components Suppl Restraint System e The pictures below shows a functional overview of a crash zone sensor used on MX 5 NB 1003_163 1 SAS module 3 Crash zone sensor not activated 2 Evaluation circuit 4 Accelerometer 1003_164 Evaluation circuit Current flow Crash zone sensor activated Impact force Activation signal SAS module OND 4 5 6 02 6 Curriculum Training Suppl Restraint System Components Side Airbag Sensors e Side airbag sensors are only used in vehicle
4. 1003_116 1 Igniter inflator no 2 igniting inflammation 4 Generated gas agent 2 Propellant 5 To airbag 3 Combustion of propellant 6 Filter Passenger Front Airbag e The passenger front airbag is folded and stored in the dashboard behind a cover with split lines It can be either a single stage or a dual stage airbag e The passenger airbag has a volume of approx 100 110 liters and is inflated within 50 80 ms after a frontal collision NOTE In all vehicles equipped with a passenger airbag a warning sticker is factory fitted to the dashboard This sticker informs the occupants that the use of rearward facing child or baby restraint seats is prohibited On some vehicles the passenger airbag can be switched off to enable the customer to place a rearward facing child or baby restraint seat on the passenger seat Those systems are explained in the sections Passenger Airbag Deactivation System and Occupant Classification Systems 02 18 Curriculum Training Suppl Restraint System Components e Mazda uses three different types of passenger front airbags One system operates similar to the single stage driver airbag One system operates similar to the dual stage driver airbag One system is inflated using highly compressed gas which is stored in a pressure chamber System Using Highly Compressed Gas e The following description explains the construction and operation of the single stage passenger front airba
5. Suppl Restraint System Components Buckle Switch e Some vehicles are equipped with buckle switches for either one or both front seat belts They are connected either to the instrument cluster or to the SAS module and serve to remind the driver passenger to fasten the seatbelt e On Mazda vehicles with buckle switches connected to the SAS module the module transmits the status of the buckle switch via CAN Controller Area Network to the instrument cluster Seat Track Position Sensor e The Tribute EP FL is equipped with a driver s seat track position sensor It is a hall element type sensor which is located under the driver s seat beside the right hand seat track and informs the SAS module how far away the driver s seat is from the steering wheel e _If the distance between the driver s seat and the steering wheel is less than a preset value only the first stage of the driver s front airbag will be deployed This reduces the risk of injury caused by airbag deployment due to reduced force to the driver s body 1003 109b 1 Connector 2 Hall element type sensor Curriculum Training 0241 Components Suppl Restraint System e The seat track position sensor consists of a Hall sensor attached to the driver seat and a metal bar attached to the floor panel When the seat is moved forwards the metal bar moves into the gap of the sensor The Hall sensor detects the change of the magnetic field and sends a corresponding signal to
6. Do not store anything on top of an undeployed airbag 1003_105 Curriculum Training 01 7 Overview Suppl Restraint System Notes 01 8 Curriculum Training Suppl Restraint System Components Components SAS Module The SAS Sophisticated Airbag Sensor module is located in the center console area and is the core component of the SRS As the name states it features at least one sensor that is engineered to detect situations requiring SRS activation Furthermore it incorporates the control module for the SRS The sensor itself is an accelerometer built into a microchip or a similar type Modern modules incorporate a crash sensor and a saving sensor The saving sensor may operate both mechanically or electronically and is used to prevent unintended triggering of the airbag e g due to electromagnetic interference The SAS module is connected to all SRS related components and is programmed with vehicle specific parameters It decides whether or not it is necessary to trigger components of the SRS The decision is based on the input signals its own sensor measurements and stored reference values Furthermore it decides which of the components must be triggered If the crash sensor and the corresponding saving sensor detect a crash event the SAS module decides within a few milliseconds whether and which component has to be triggered Depending on crash severity and other values the front airbags and seat belt pretensioners are t
7. WDS function Programmable Module Installation must be used for the replacement of the SAS module as described in the following 1 NOTE NOTE NOTE 04 16 Connect the WDS to the DLC2 and start the vehicle identification process During that process the WDS retrieves the configuration data from all programmable modules Select Module programming gt Programmable module installation gt RCM from the WDS Toolbox menu WDS will request you to replace the module Replace the SAS module according to the safety instructions stated in the respective W M Follow the instructions of WDS to finish the configuration of the SAS module Verify that no DTC is logged in the SAS module If necessary perform the applicable DTC troubleshooting procedure Always perform the vehicle identification with WDS before the replacement of the SAS module Save a session of the vehicle before starting the programming procedure Therefore establish and end the session with the option Hold saves recordings Then establish communication again without reactivating the held session and conduct the desired programming function If the upload process fails and a module is left blank the held session can be used to program this module If accidentally the ignition is turned off or the 16 pin DLC cable is disconnected during the upload process an error message asking Do you wish to retry will appear Press YES as this will allow WDS
8. against rapid acceleration of the webbing used on the MPV LW is described below Other vehicles are equipped with similar systems e The ELR mechanism is activated by the extraction of the belt When the extraction speed is above a specified level the pawl engages into the housing gear This locks up the locking base as well as the torsion bar and guide drum integrated to the locking base Thus the belt cannot be more extracted until the tension is released from it 1003_ 128 1 Housing gear 4 Guide drum 2 Locking base 5 Torsion bar 3 Pawl 6 Pawl engages the housing gear Curriculum Training 02 29 Components Suppl Restraint System e The ELR mechanism locking in case of deceleration changes of direction tilted vehicle and sudden stop is described below The pictures serve only as an example e The ELR consists of a ball a lever and a lock gear attached to the guide drum e The ball is free to move When the vehicle is not on level ground or a sudden shock is applied to the vehicle the ball moves to push the lever upward so that it engages with the lock gear and stops the rotation of the guide drum e The guide drum will be unlocked when the ball is moved back to its initial position and no tension is applied to the seatbelt 1003_173 1 Lock gear attached to the guide drum 4 ELR release function not operated 2 Actuator 5 ELR release function operated 3 Ball 02 30 Curriculum Training Suppl Restraint System Componen
9. e An airbag achieves the best possible effect in conjunction with the seatbelt and is triggered only in case of a serious accident in which the safety of the occupants cannot be guaranteed by the seatbelts alone Therefore it is designed to reduce the occupant s forward movement in a controlled manner in order to reduce force applied to the body and organs e This training manual explains SRS components and systems used on the current Mazda vehicles European specification only and their predecessors as well as the appropriate diagnostic and installation procedures NOTE Before starting the diagnosis or repair of the SRS always check whether any service information relevant to the malfunction has been published e Additional information about the current SRS can be found in the following sections of the respective W M Section T in the W M with former layout Section Restraints in the W M on the CD ESI Section 5 Body and Paint Supplemental Restraint System on the service manual CD for Mazda2 Respective W D Wiring Diagram Curriculum Training 01 1 Overview Suppl Restraint System Parts Location e The picture on the next page is an example and shows the SRS components of the Mazda6 The SRS can consist of the following components not all vehicles are equipped with all components NOTE 01 2 Seat track postion sensor Buckle switches Passenger airbag deactivation system
10. is properly belted using the ALR function a belt tension high signal is transmitted to the SAS control module 1003_148 e The SAS module uses the signals from the seat weight sensor and the belt tension sensor to determine whether and whereby the front passenger seat is occupied The table below is an overview of the PODS functionality Passenger front airbag and belt pretensioner will not be triggered Passenger front airbag and belt pretensioner will be triggered if necessary PAD indicator light illuminated Curriculum Training No load Low load Between low and high load Buckled without ALR function belt is not tensioned Buckled with ALR function belt is tensioned High load 02 55 Components Suppl Restraint System Mazda Vehicles and their SRS Components e The tables on the following pages show which SRS component may be installed in which vehicle Not all vehicles are equipped with all components Tribute Tribute FL Component EP EP 1 Single stage Dual stage Single stage Dual stage Integrated in belt retractor pretensioner Integrated in belt buckle Crash zone sensor Driver side Passenger side Seat track position sensor 1 from model year 2005 onwards 02 56 Curriculum Training Suppl Restraint System Components MPV FL1 MPV FL2 Premacy B Ser
11. of the WDS NOTE The SRS warning light and the warning chime of the Tribute EP before F L are currently the only components of the SRS variants that can be activated via the simulation test function Additional Diagnostic Items Most diagnostic procedures of the SRS require a system deactivation before the start of measuring disconnecting and or replacing of components These procedures require the deployable SRS components to be disconnected from the SAS module thereby minimizing the risk of deployment while diagnosis is carried out When performing diagnosis on deployable SRS components a SST Special Service Tool has to be connected to the wiring harness instead of the component in question This SST either the fuel and thermometer checker or a simulator depending on the vehicle simulates the resistance of the corresponding component This helps to determine whether the component wiring or SAS module is defective It is not possible to short circuit any SRS component connector with a jumper wire since the SAS module would detect this as a malfunction The picture below shows one of the simulators and the fuel and thermometer checker which has to be connected and set according to the instructions in the respective W M 1003 156 Simulator 2 Fuel and thermometer checker NOTE Remove the SST from vehicle prior to road use Failure to follow this instruction could result in serious injury and possible violat
12. or occupant classification system Crash zone sensor Side airbag sensors SAS Sophisticated Airbag Sensor module Passenger airbag cut off indicator light SRS warning light Clock spring Driver and passenger front airbags Side airbags Curtain airbags Pretensioners Each gas generator features a sticker with barcode order number and serial number Thus it is possible to track the component throughout its production installation and service life Curriculum Training Suppl Restraint System Overview 1003_106 1 SRS warning light 7 Side airbag sensor 2 Clock spring 8 Belt pretensioner 3 Passenger front airbag 9 Side airbag 4 Crash zone sensor 10 Occupancy sensor 5 SAS module 11 Curtain airbag 6 ee airbag deactivation indicator 12 Driver front airbag Directives for Working on SRS e When working on the SRS always follow carefully the directives and warnings stated in the W M and in this training manual It is also mandatory to comply with the specific national requirements concerning explosive material handling e The work on SRS must be carried out by skilled professional personnel who are familiar with the safety regulations and who take special measures to ensure that these are followed The relevant rules and directives must be observed especially regarding Directives of the responsible authorities Accident prevention Environment protection Storage of the components Curriculum Training 01 3
13. past DTCs hook up the WDS to the DLC 2 and perform a self test of the SAS module select Self test gt Modules gt RCM The description of the DTCs and the recommended diagnostic procedure can be found in the respective W M NOTE Present DTCs displayed by the SRS warning light serve only as a reference Always use WDS to verify the more specific five digit DTCs NOTE The OBD systems of the 2 and of the 3 SRS generation display different DTCs for identical malfunctions OOUUOODR 1003_159 DLC2 Curriculum Training 04 5 Diagnosis and Repair Suppl Restraint System e Present DTCs are displayed as ODDTCs On Demand DTC and CMDTCs Continuous Memory DTC on WDS while past DTCs are only displayed as CMDTCs e Inthe example below the DTCs B1932 and B2232 are present and are therefore displayed as ODDTCs as well as CMDTCs The other CMDTCs have been stored in the past but are no longer present on the vehicle These DTCs remain in the memory of the SAS module until they are deleted with WDS Select Option Helpscreen Airbag ODDTCs B1932 RCM B2232 RCM Airbag CMDTCs Select item for more information B1877 30 RCM B1932 FO RCM B1994 30 RCM B2232 FO RCM vvv AN YV AN AN AN vY y B2432 30 RCM 1003_S001 NOTE Delete the stored DTCs from the memory of the SAS module after the repair is completed 04 6 Curriculum Training Suppl Restraint System Diagnosis and Repair PID Monitor Fun
14. position for 5 s or more The engine is started 3 Verify that the SRS warning light illuminates for approx 6 s and goes out 4 If the airbag system warning light does not operate normally refer to the OBD system and perform inspection of the system as described in the W M 04 14 Curriculum Training Suppl Restraint System Diagnosis and Repair SAS Module e For the replacement of the SAS module of the 2 and 3 SRS generation different procedures are required SAS Module Replacement 2 SRS Generation 1 Replace the SAS module according to the safety instructions stated in the respective W M Turn the ignition switch to the ON position and verify that the SRS warning light flashes continuously If it does not flash the OBD system has detected a malfunction Turn the ignition switch to the OFF position for more than 1 s and switch it back to the ON position Deployment Authorization Procedure Verify that the SRS warning light illuminates for approximately 6 s and then goes off If the light stays on repeat the Deployment Authorization Procedure Verify that no DTC is logged in the SAS module If necessary perform the applicable DTC troubleshooting procedure Curriculum Training 04 15 Diagnosis and Repair Suppl Restraint System SAS Module Replacement with WDS 3 SRS Generation e The installation of anew SAS module requires configuration data to be transferred from the old module Therefore the
15. side 4 Rear door lower latch switch right side 10 Instrument cluster 5 Rear door upper latch switch right side 11 Front buckle switch left side 6 Front door switch right side 12 Lock release solenoid left side 02 32 Curriculum Training POND Suppl Restraint System Components When the ELR release function is not operated normal condition e g when driving the ball lock release solenoid is not activated thus the ball is free to move When the vehicle is not on level ground or a sudden shock is applied to the vehicle the ball moves to push the actuator upward so that it engages with the lock gear and stops the rotation of the guide drum When a rear door is opened and the corresponding front seatbelt is not buckled the respective lock release solenoid is actuated from the RKE module via the switches and pushes the cancel lever upward As a result the actuator and ball are fixed in their positions Due to this the front seat belt unwinds smoothly when the rear door is opened The ELR release function does not operate under the following conditions When the coresponding rear door is closed When the corresponding front seatbelt is buckled When one hour has elapsed with a door open battery saver function When the battery is disconnected or the ROOM fuse is removed 1003_174 Lock release solenoid 5 Cancel lever Lock gear 6 ELR release function not operated Actuator 7 ELR release function op
16. the second stage is always triggered with time delay approx 0 1 seconds after the first stage This is done for safety reasons to ensure that the second stage cannot accidentally deploy during subsequent rescue work 02 16 Curriculum Training Suppl Restraint System Components e The following description explains the construction and operation of the dual stage airbag used on Mazda3 BK vehicles Similar systems are used on other vehicles e When the first stage is triggered by a signal from the SAS module the igniter built into inflator no 1 builds up heat and ignites the inflammation agent e The ignition of the inflammation agent causes the combustion of the propellant which releases nitrogen gas e The gas generated in the inflator is filtered and cooled by the metal filter and then output to the airbag 1003 115 1 Igniter inflator no 1 during triggering 5 Combustion of propellant 2 Inflammation agent 6 Filter 3 Ignition of inflammation agent 7 To airbag 4 Propellant Curriculum Training 02 17 Components Suppl Restraint System e When the second stage is triggered by a signal from the SAS module the igniter built into inflator no 2 builds up heat and ignites the inflammation agent e The ignition of the inflammation agent causes the combustion of a propellant which releases nitrogen gas e The gas generated in the inflator is filtered and cooled by the metal filter and then output to the airbag
17. to recover the error that was encountered during the programming function Pressing NO may result in the module being left blank Curriculum Training Suppl Restraint System Diagnosis and Repair Manual Module Configuration e If WDS was unable to retrieve configuration data because of either a non functioning module or a module which was removed and discarded before WDS was allowed to retrieve the data the SAS module must be configured manually with the so called As built data These data are the records of the applicable module configurations stored in each module as the vehicle left the factory The As built data contain information about the specific functions of a certain vehicle variant in the form of hexadecimal numbers e The following picture shows a sample of an As built data sheet It contains the As built data for the PCM Powertrain Control Module and the BCE Body Chassis Electrical modules of a certain vehicle variant identified by the VIN The data are only applicable for this specific vehicle and therefore must not be used for any other vehicle e The data highlighted in the data sheet below are required to manually configure the SAS module of this vehicle Module Reprogramming VIN JMZBK14F 241101114 Vehicle Data 1CCD FFFF FFE6 PCM Module BCE Modules PCM 1 FFFF FFFF 0310 720 01 2100 8100 OOCA PCM 2 35FF FFFF FF43 726 01 8CDO C480 400E PCM 3 FF41 FFFF FF50 730 01 0000 004A 4DCF PCM 4 FFFF FFFF FFOF 730 02
18. when the triggering signal is sent from the SAS module This ignites the inflammation agent causing the combustion of the propellant that releases nitrogen gas e As the pressure increases it shifts the nail into the break washer thus the L steel lock is released and the L steel moves destroying the break washer with the aid of the nail As a result the inert gas out of the pressure chamber is mixed with combustion gas and inflates the side airbag via the inner tube e The side airbag begins to deflate about 100 ms after being inflated CSE mii AF EI 1003_124 1 Igniter 6 L Steel 2 Combustion of inflammation agent 7 Nail 3 Break washer 8 Inert gas 4 Pressure chamber 9 To airbag 5 Propellant 10 Inner tube NOTE Inside the pressure chamber the gas is stored with a pressure of 300 bar Thus all damages to the housing are very dangerous Furthermore the high pressure requires additional accident prevention directives to be followed in some countries when servicing Curriculum Training 02 23 Components Suppl Restraint System Curtain Airbag e The curtain airbag increases the head and shoulder protection of the front and rear seat occupants in the event of a side impact Therefore it uses the space between the occupants and the doors If triggered from the SAS module it is inflated along the roof between the A and C pillars where it is stored behind the trim e The curtain airbag has a volume of ap
19. 5A42 4631 3485 PCM 5 FFFF FFFF FF10 730 03 4632 3431 3148 PCM 6 FFFF FFFF FF11 730 04 3031 3131 3432 PCM 7 FFFF FFFF FFI 2 730 05 0200 0000 003E PCM 8 FFFF FFFF FF13 737 01 66EE 0088 001B PCM 9 FFFF FFFF FF14 751 01 FFFF FFFF FF54 PCM 10 FFFF FFFF FF15 751 02 FFFF FFFF FF55 PCM 11 FFFF FFFF FF16 751 03 FFFF FFFF FF56 PCM 12 FFFF FFFF FF17 751 04 FFFF FFFF FF57 PCM 13 FFFF FFFF FF18 751 05 FFFF FFFF FF58 751 06 FFFF FFFF FF59 751 07 FFFF FFFF FF5A 751 08 FFFF FFFF FF5B End of As Built information 1003_157 NOTE The As built data can be obtained via the Technical Hotline or the Technical Service Department Curriculum Training 04 17 Diagnosis and Repair Suppl Restraint System e f As built data are required for module configuration the WDS displays a screen with the module identification code and three boxes for the hexadecimal numbers After matching the module identification code in this example 737 01 with the identical code on the As built data sheet the corresponding hexadecimal numbers in this example 66EE 0088 001B can be entered into the three boxes FFFF FFFF FFFF 1003_S007 e After pressing the Tick button the programming process begins automatically and a bargraph appears indicating the progress NOTE Do not configure a module by downloading configuration data from another vehicle of similar build and uploading it into the vehicle concerned This may create problems as configurable modules
20. Generation 04 16 Manual Module Configuration ii iss a ea Edge e Ee ee anane ie eed 04 17 List of AbbreviationS ese KERR KEER EES EE EE abona EK Nee ER ERGE ED atenian 05 1 Curriculum Training Supp Restraint System Introduction Introduction e With the introduction of seatbelts as an occupant restraint system for all passenger cars the number of people subjected to serious injury or death has been dramatically reduced As a further result the customers and the authorities asked for more safety systems and the car manufacturers developed them accordingly to provide more safety to the customers One of those systems is the so called SRS Supplemental Restraint System that assists the seatbelts in restraining the occupants in case of an accident e Mazda s SRS features one ore more of the following additional restraint systems Front airbags Side airbags Curtain airbags Pretensioners e All Mazda vehicles that are currently sold in Europe are equipped with a SRS consisting of at least front airbags on the driver and passenger side Some vehicles are equipped with up to six airbags in total e The skills needed to diagnose and repair SRS related concerns require comprehensive system knowledge because any mistake can lead to serious injury or death of the occupants or even of the technician who works on the system This course is a theoretical and practical guide to gain general and Mazda specific knowledg
21. Overview Suppl Restraint System e When handling SRS components the following points should be observed 01 4 SRS components can accidentally deploy during related work or bodywork such as welding dent repair etc Never disconnect components before the system is secured against unintentional triggering Therefore depower the SRS according to the related W M to avoid serious injury or death Always disconnect the battery before welding to avoid unintentional triggering of SRS components Non triggered SRS components must not be littered They must be shipped back to the manufacturer in the original component packaging The sender has to inform the shipping company of the explosive content and the components must not be shipped by postal service If pyrotechnic residue from SRS components contacts the eyes immediately wash the eyes thoroughly with clean water and seek medical assistance If a large amount of pyrotechnic residue is inhaled seek medical assistance When handling deployed SRS components wear safety gloves and glasses to protect your skin and eyes from being irritated due to pyrotechnic residue The propellant inside of the SRS components is self ignited at an ambient temperature of about 175 C Single components of the SRS must not be disassembled because the system may be inoperative after reassembling which may result in serious injury or death in case of an accident The components must always be replaced as
22. are only working properly if they are configured according to the appropriate data specified by each VIN In addition this procedure may also transfer the VIN logged in the module from one vehicle to another 04 18 Curriculum Training Suppl Restraint System Diagnosis and Repair e The configuration of the SAS module of the Mazda is different from the procedure described above Here the configuration data must be selected from a pick list displayed by WDS The pick list contains parameters to be selected on the left hand side of the screen After highlighting a certain item the possible settings appear on the right hand side of the screen Now the user can select the configuration data by highlighting the desired settings Airbag RCM airbag cut off switch not airbag cut off switch equipped side equipped side curtains equipped curtains equipped airbag cut off switch not equipped side curtains equipped airbag cut off switch not equipped side curtains not equipped airbag cut off switch equipped side curtains not equipped 1003_S006 e After pressing the Tick button the programming process begins automatically and a bargraph appears indicating the progress Curriculum Training 04 19 Diagnosis and Repair Suppl Restraint System Notes 04 20 Curriculum Training Suppl Restraint System ALR Automatic Locking Retractor AC Alternating Current CAN Controller Area Network DC Direct Current DLC Data Link Connect
23. complete units 1003_101 Curriculum Training Suppl Restraint System Overview If a problem is found in the SRS wiring always follow the procedures of the corresponding W M for the repair sequence A wiring harness that is incorrectly repaired may result in an airbag or pretensioner not being deployed or being deployed accidentally leading to serious injury or death 1003 102 Anohmmeter must not be used to inspect an airbag or pretensioner because it can deploy the component what may result in serious injury or death Always use the on board diagnostic function to diagnose an airbag or pretensioner for malfunctions 1003 103 Curriculum Training 01 5 Overview Suppl Restraint System Measuring probes must be inserted only from the wiring harness side when inspecting the wiring according to the W M Otherwise the terminal can be widened causing a poor connection and a malfunction of the SRS NG AE When carrying an undeployed airbag point the front surface away from your body to reduce the risk of injury in case it accidentally deploys 1003_158 1003 104 01 6 Curriculum Training Suppl Restraint System Overview Anundeployed airbag must not be placed face down on its surface Because if it deploys the motion of the airbag may result in serious injury or death Therefore always face the front surface up to reduce the motion of the airbag in case it accidentally deploys
24. cription explains the construction and operation of the single stage airbag used on B Series UN vehicles Similar systems are used on other vehicles 1003 110 Inflator 4 Inner retainer Outer retainer 5 Center cover Airbag Curriculum Training 02 13 Components Suppl Restraint System e The igniter built into the inflator begins to build up heat when the triggering signal is sent from the SAS module This heat ignites the inflammation agent 1003_111 1 Propellant 3 Igniter 2 Ignition of inflammation agent e The ignition of the inflammation agent causes the combustion of a propellant that produces nitrogen gas 1003_112 1 Combustion of propellant 02 14 Curriculum Training Suppl Restraint System Components e The nitrogen produced in the inflator is filtered and cooled by the filter from about 600 800 C to less than 80 C before being output to the airbag 1003_113 1 To airbag 2 Filter e The airbag breaks through the tear line of the airbag cover when it is inflated with the driver s head contacting it when it is completely inflated The force transmitted to the driver is reduced by allowing gas to escape through the vent hole 1003 114 1 Vent hole e As the driver strikes the airbag it begins to deflate and is completely deflated after less than one second from the beginning of the accident NOTE The powdery substance released from the airbag during inflation is talcum powder or a similar
25. ction e The PID Parameter IDentification monitor function allows to display the status of system parameters using the Datalogger of WDS PID Name definition Ra N Condition specification ea CONT_RCM DTC is detected 1 255 Number of continuous DTC DTC is not detected 0 Related wiring harness normal NORMAL Related wiring harness circuit open DS1_STAT OPEN Driver airbag inflator No 1 circuit state Related wiring harness short to ground SHRT GND Related wiring harness short to power supply SHRT B Related wiring harness normal NORMAL Related wiring harness circuit open PS1_STAT OPEN Passenger airbag inflator i No 1 circuit state Related wiring harness short to ground SHRT GND Related wiring harness short to power supply SHRT B DABAGR Driver airbag module Under any condition 1 5 3 7 ohm inflator No 1 resistance PABAGR Passenger airbag module Under any condition 1 4 2 9 ohm inflator No 1 resistance 1003 TOO1 Excerpt of PID table for Mazda6 NOTE Depending on the vehicle various PIDs are available The SRS use different PID names for identical parameters Refer to the respective W M and WDS for the corresponding name description Curriculum Training 04 7 Diagnosis and Repair Suppl Restraint System Simulation Test Function The simulation test function also termed as Active Command Mode allows to activate certain SRS components using the OSC Output State Control function
26. de drum and retracts the seatbelt 1003_ 138 1 Rotor 4 Gas generator 2 Clutch key 5 Gas pressure 3 Clutch gear 02 42 Curriculum Training Suppl Restraint System Components Buckle Operated Belt Pretensioner e The cable operated belt pretensioner is integrated in the belt buckle 1003_139 1 Cover 8 Cam 2 Collar screw 9 Tube 3 Cable guide of the bracket 10 Press sleeve 4 Corrugated tube 11 Piston 5 Cable guide of the buckle 12 Gas generator 6 Belt buckle 13 Bracket 7 Steel cable Curriculum Training 02 43 Components Suppl Restraint System e When the pretensioner is triggered by a signal from the SAS module the gas generator produces combustion gas e The expanding gas pushes the piston inside the tube pulling the steel cable Thus the buckle attached to the cable is also pulled and removes any slack from the seatbelt 1003_140 1 Gas generator 4 Belt buckle 2 Combustion gas 5 Piston 3 Tube 6 Steel cable e In order to restraint the occupant after the belt pretensioner has been triggered the steel cable is clinched by the cam to lock the buckle in this position 1003_141 1 Belt buckle 3 Steel cable 2 Cam 02 44 Curriculum Training Suppl Restraint System Components Belt Force Limiter e Seatbelts that feature a belt pretensioner are usually equipped with a belt force limiter mechanism in order to reduce the risk of chest injuries in case of an accident e The belt force limiter is integrated
27. e about the various SRS i e their components function and diagnosis e Any person associated with the diagnosis and repair of SRSs must have the knowledge to deliver a Fix it right first time repair Therefore the Mazda Masters Development and Qualification path provides the following training course required for the service on SRSs Supplemental Restraint System CT L1003 e The ranking of this course within the Mazda Masters educational system is Level 1 Mazda Technician It is focused on technicians that have already experience in maintaining and repairing Mazda vehicles and have previously attended the courses New To Mazda CT L1001 and Basic Electrics CT L1004 Curriculum Training 00 1 Introduction Suppl Restraint System e The training manual Supplemental Restraint System is divided into the following main chapters NOTE 00 2 Overview Components Operation Diagnosis and Repair The data tables and procedures represented in this training manual serve only as examples They are taken from the service literature and subjected to major or minor changes in the course of time To prevent any mis diagnosis refer always to the current service literature while working on SRSs Curriculum Training Suppl Restraint System Overview Overview Fundamentals e Nowadays all vehicles are equipped with a SRS in order to ensure optimum protection of the occupants in case of an accident
28. e gas generator produces combustion gas e The balls are forced up in the pipe as the pressure in the housing increases due to the expanding gas The balls movement engages the ring gear with the pinion and transfers rotational movement via the torsion bar to the guide drum Thus the guide drum rotates and retracts the seatbelt 1003_135 1 Pinion 4 Gas pressure 2 Ring gear 5 Gas generator 3 Ball 02 40 Curriculum Training Suppl Restraint System Components Rotor Operated Belt Pretensioner e The rotor operated belt pretensioner is integrated in the belt retractor 1003_136 1 Clutch gear 7 Retainer 2 Pawl 8 Sealed piece A 3 Guide drum 9 Clutch key 4 Housing 10 Fitting key 5 Rotor housing 11 Sealed piece B 6 Gas generator 12 Rotor Curriculum Training 02 41 Components Suppl Restraint System e The guide drum has a clutch gear on its end which rotates with the guide drum according to the movement of the belt The rotor around the gear is not engaged with the gear during normal operation thus it does not rotate even when the belt is retracted or withdrawn 1003_ 137 1 Clutch gear 4 Clutch key 2 Guide drum 5 Gas generator 3 Rotor e When the pretensioner is triggered by a signal from the SAS module the gas generator generates combustion gas e The expanding gas increases the pressure in the housing pushes up the clutch key and engages the rotor and clutch gear As a result the rotor rotates together with the gui
29. elift 02 53 Mazda Vehicles and their SRS Components 02 56 Curriculum Training Table of Contents Suppl Restraint System Operatori sasana adana Ee De na anaa aaa EN ana au aaa aa 03 1 Parts FoealOn si idees ele da ti Eg aaa Ed aa naa 03 1 Frontal CONSIGN sesa ENENG DENE DENG NENG DENE eu oua ri Ee 03 2 Side Impact EE EO OO OE EE 03 3 Wiring Diagram aaa daa aaa data daa De ee da aaa ada ca 03 4 Diagnosis and Repalf EE EE N caca ee nagan aaa 04 1 On Board Diagnostic System nenea 04 1 OBD System of the 2 Generation cecene 04 2 Present Malfunctions si ie ie dea ai aid ai adi fai ni 04 2 Past MaltinGUON Sis ESE A oii atare 04 3 OBD of the 3 Generation ee ee ee ee ee ee ee ek ek ee ee eg ee ee ee ee ee ee ee 04 4 Present and Past Malfunctions ccccccceeeeeeeeeneeeeeeeeeeeeeeeeteneeeeeeeees 04 5 PID Monitor Funelon issie sede de ed oe ede iata de ed ae ee 04 7 Simulation Test EuneliGN iss ENE ER abea a N Ee ee 04 8 Additional Diagnostic ltems ii iese AA ee anane anae 04 8 Troubleshooting Example esse ees ee ee ee ee ee ee ee ee ee ee ee ee 04 9 SRS Component Replacement cccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneaeees 04 14 Side Airbag Sensor Replacement on the Mazda3 RX 8 04 14 SAS MOGU Bit asin asa oo za ba RE at d N N OD baa a aan abt 04 15 SAS Module Replacement 2 SRS Generation 0 eed 04 15 SAS Module Replacement with WDS 3 SRS
30. ent cluster If the SAS module detects a fault the SRS warning light flashes or illuminates e fan open circuit exists in the cable connection between the SRS warning light and the SAS module the warning light will be automatically illuminated by the internal control circuit of the instrument cluster NOTE The overall SRS or some of its components may remain operational even when the SRS warning light flashes or is illuminated e Depending on the vehicle a malfunction of the SRS warning light is indicated by a warning buzzer 1003_162 1 SRS warning light Curriculum Training 02 3 Suppl Restraint System Components The picture below is an excerpt from the Mazda3 W D and shows the SRS warning light in the instrument cluster HOLIMS 3UNSS3Hd NO Cozzo A 20 9 0 8 wor Vas 24 2260 NOLLO3S HALNAWOOOHOIN OL HALNAWOODOHOIN OL LINDHID JAWA HOLVOIONI 4019313S E wanan ana NOLLO3130 aid UNYI ae TTT LEEI EJ 431SN19 LNSWNYLSNI 1 F Leseed ewe uan dis wane dew wan maw taa EE AE GEE NEE a kt 2 1 i i 9 8160 NOLLO3S o gt i Vy 4 S 8160 NOLLO3S 1 AV134 LHOM 903 UVay Wu i uu AS wg OM Lae seders EE JHON OO INOI HUM oana d INVOVA HOSN3S T3A3T OIT4 YIHSYM HLM WALSAS ONIT3A31 OLNY LHOMOVSH HUM O 1H9N 904 LNOWS HLIM lt gt W31SAS ONIT3A37 OLNV AHOINIV3H HLIM ONY W31SAS NOLLVOLVNHVO HUM 1003_176 ining Curriculum Tra 02 4
31. ention directives to be followed in some countries when servicing Curriculum Training 02 25 Components Suppl Restraint System Connectors in Trigger Circuit e Usually all component side connectors and components in the airbag trigger circuit are equipped with a short circuit contact to avoid unintentional deployment of SRS components e When the connector is disconnected a short circuit contact is closed inside the connector between both pins to ensure that no current can flow through the disconnected component and deploy it even if the connector is accidentally supplied with electrical current e When the connectors are reconnected the short circuit contact is mechanically opened and the component can be triggered again 1003 150 A Connector connected 6 Short circuit contact B Connector disconnected 7 No contact 1 Short circuit contact 8 Short circuit contact 2 Housing connector 9 Power supply terminal 3 Contact socket 10 Ground terminal 4 Short circuit contact touches terminal 11 Isolator bar 5 Contact touches terminal 02 26 Curriculum Training Suppl Restraint System Components Seatbelt e The whole SRS is not able to protect an occupant if he does not properly wear the seatbelt Most seats are equipped with three point seatbelts which hold the occupant in his seat and reduces uncontrolled movement of the occupant s body in case of an accident e The seatbelts that are used on Mazda vehicles feature an Emer
32. erated 8 Ball Actuator fulcrum Curriculum Training 02 33 Components Suppl Restraint System Automatic Locking Retractor e The ALR Automatic Locking Retractor function enables the customer to fix a child restraint seat securely onto a seat The seatbelt retractor automatically locks and remains locked when it is buckled and does not allow any freedom of movement e To enable the ALR function the seatbelt has to be pulled out completely A ratcheting noise can be heard when the belt is pulled then back onto the guide drum Then the belt length can only be decreased but not increased The ALR function is disabled automatically when the seatbelt is pulled back onto the guide drum completely NOTE Depending on the vehicle all seats except for the driver seat can be equipped with this special feature Most seatbelts with ALR function can be identified by a special patch as shown below 1003_129 Sample patch for ALR 02 34 Curriculum Training Suppl Restraint System Components Belt Pretensioner e Most front seatbelts are equipped with a belt pretensioner system that serves to remove excess slack from the seatbelt in case of an accident Mazda uses pyrotechnic belt pretensioners e f triggered from the SAS module the belt pretensioner needs approx 15 ms to remove up to approx 6 12 cm slack from the seatbelt NOTE If the belt pretensioners are triggered the seatbelts have to be replaced as a unit If the belt p
33. eshooting procedure The troubleshooting procedures for DTC B1932 and B2232 describe the detection condition for the faults and the following possible causes for the malfunction Open or short circuit in the wiring between clock spring and SAS module Clock spring malfunction Driver air bag inflator no 1 respectively inflator no 2 malfunction SAS module malfunction Check the resistance value of the driver airbag circuit via the PIDs DABGR and D ABGR2 Monitor the PIDs of the SRS with WDS Datalogger Select Toolbox gt Datalogger gt Modules gt RCM 04 10 Select the following PIDs from the PID selection menu DABGR Resistance of the driver airbag inflator no 1 D ABGR2 Resistance of the driver airbag inflator no 2 PABGR Resistance of the passenger airbag inflator no 1 CCNT RCM Number of continuous DTCs DS1 STAT Driver airbag inflator no 1 circuit state DS2 STAT Driver airbag inflator no 2 circuit state PS1 STAT Passenger airbag inflator no 1 circuit state Curriculum Training Suppl Restraint System Diagnosis and Repair e The PIDs DABAGR and D ABAGR2 indicate a too high resistance of the driver airbag inflator no 1 and inflator no 2 circuit The value of 25 5 ohm is calculated by WDS and means that an open circuit exists The PIDs DS1_STAT and DS2_STAT displaying OPEN also indicate this open circuit in the driver ai
34. g used on B Series UN vehicles e The so called hybrid airbags have two advantages The temperatures generated during airbag deployment are in the range below 60 C The lower expansion energy acts less aggressively on the occupants 1003_118 1 Retainer 4 Airbag 2 Inflator 5 Airbag cover 3 Mid plate Curriculum Training 02 19 Components Suppl Restraint System e The igniter built into the inflator begins to build up heat when the triggering signal is sent from the SAS module This heat ignites the inflammation agent 1003_119 1 Igniter 3 Highly compressed inert gas 2 Ignition of inflammation agent e As the pressure increases due to the combustion of the inflammation agent it breaks the wall between the inflammation agent and the inert gas 1003_120 1 Combustion of inflammation agent 02 20 Curriculum Training Suppl Restraint System Components Therefore the inert gas expands in reaction to the heat created by the combustion of the e inflammation agent breaks through the wall of the discharge section and inflates the airbag 1003 121 1 To airbag 3 Discharge section wall 2 Inert gas NOTE Inside the pressure chamber the gas is stored with a pressure of 300 bar Thus all damages to the housing are very dangerous Furthermore the high pressure reguires additional accident prevention directives to be followed in some countries when servicing Curriculum Training 02 21 Compone
35. gency Locking Retractor function In addition they can be equipped with an Automatic Locking Retractor a belt pretensioner and a belt load limiter NOTE The seatbelts have to be inspected after each accident Depending on the vehicle type they have to be replaced even when the pretensioners are not triggered and there is no wear Therefore always refer to the W M when inspecting the seatbelts e The picture below shows an overview of the seatbelts used on the Mazda3 Bk 4SD a SR 1003 127 1 Front seatbelt 4 Rear buckle 2 Rear outer seatbelt 5 Front buckle 3 Rear center seat belt Curriculum Training 02 27 Components Suppl Restraint System e The picture below shows the construction of a belt retractor used on the Mazad3 Bk Spring cover Retractor spring Spring plate Housing Webbing guide Lever B Weight Bearing Wobble gear Cover Pawl A AOO0ONOO0 POND 02 28 1003 169 Tie Bar Adapter Lever C Lever A Steering disc Steering disc spring Bushing Steering head Ring Torsion bar Guide drum Curriculum Training Suppl Restraint System Components Emergency Locking Retractor e The ELR Emergency Locking Retractor function allows the belt to be freely extracted or retracted thus allowing free movement of the belted occupant It only locks up when either the vehicle decelerates changes direction is tilted stops suddenly or when the webbing is accelerated rapidly e The ELR
36. hen the passenger seat is either not occupied or the load is below the specified limit the SAS module uses this information to deactivate the passenger airbag belt pretensioner and side airbag Thus they will not be triggered even in case of a serious accident 1003_171 Occupancy sensor One sending antenna Two receiving antennas Sensor module Seat not occupied high resistance Seat occupied low resistance Resistance mat POND NO Ol e Furthermore the occupancy sensor is able to detect a child restraint seat with transponders Therefore it generates an electric field using the sending antenna In case a Mazda child restraint seat with integrated transponders is used the transponders are excited by the electric field so that they impose a code on the sending field by means of modulation This electric field is detected via the two receiving antennas and evaluated by the control module Curriculum Training 02 51 Components Suppl Restraint System e Asa result the control module sends a corresponding signal to the SAS module to inform it about the installation of a child restraint seat Because of that the SAS module will activate the PAD indicator light and will not trigger the accompanying components even if the vehicle is involved in a serious accident e The child restraint seat will be detected by the PODS within a maximum of 40 seconds after it has been installed NOTE Metal parts or magnetic cards must no
37. ies LW 1 LW 2 CP UN Component Single stage Dual stage Single stage Dual stage Integrated in belt retractor pretensioner Integrated in belt buckle Crash zone sensor Driver side Buckle switch Passenger side Seat track position sensor 1 above VIN Vehicle Identification Number 200 000 2 above VIN 300 000 3 above VIN 200 000 Curriculum Training 02 57 Components Suppl Restraint System Notes 02 58 Curriculum Training Suppl Restraint System Operation Operation e The operation of the SRS is described on the following pages All explanations are based on the Mazda3 Other vehicles are equipped with similar systems Parts Location 1003 151 1 Crash zone sensor 7 Passenger front airbag 2 SRS warning light 8 SAS module 3 PAD switch 9 Pretensioner front buckle 4 Clock spring 10 Side airbag sensor 5 Driver front airbag 11 Side airbag 6 PAD indicator 12 Curtain airbag Curriculum Training 03 1 Operation Suppl Restraint System Frontal Collision If a vehicle is involved in such a serious frontal collision that the measured values of the accelerometers exceed the triggering threshold of the SAS module the relevant SRS components will be triggered by a signal from the module The pretensioners and the first stage of the front airbags are triggered simultaneously The pretensioner reaches full effectiveness withi
38. in the belt retractor and consists of a torsion bar which connects the guide drum to the locking base e When the locking base is locked due to the operation of the ELR and a significant force that could cause further injury to the chest area is applied to the belt the torsion bar twists and absorbs the overload against the chest NOTE The seatbelt has to be replaced after activation of the belt pretensioner even in case of a buckle operated type or after operation of the belt force limiter 1003_142 1 Belt 3 Torsion bar 2 Guide drum 4 Locking base Curriculum Training 02 45 Components Suppl Restraint System Seatbelt Inspection e lfthevehicle has been involved in an accident with operation of the belt force limiter the belt and anchor rub strongly against each other leaving a trace of wear e To check the seatbelt it has to be pulled out from the retractor and inspected for trace of wear If any trace of wear can be seen or felt the seatbelt has to be replaced as a complete unit 1003_170 1 Belt 3 Trace of wear 2 Anchor 4 Pull out 02 46 Curriculum Training Suppl Restraint System Components Passenger Airbag Deactivation System e The PAD Passenger Airbag Deactivation system is manually operated by the driver It deactivates the front airbag belt pretensioner and side airbag on the front passenger side NOTE Curtain airbags cannot be deact
39. int System e When the pretensioner is triggered by a signal from the SAS module the gas generator produces combustion gas e As the pressure in the housing increases due to the expanding gas the piston is pushed up shears off the piston stopper engages the gear and causes the pinion to rotate Asa result the spindle rotates the guide drum and retracts the seatbelt ALGE D V TSZ wy AR 4 NI 1003_ 132 1 Belt 5 Spindle 2 Piston stopper 6 Gas pressure 3 Piston with rack 7 Housing 4 Pinion 8 Guide drum 02 38 Curriculum Training Suppl Restraint System Ball Operated Belt Pretensioner Components e The ball operated belt pretensioner is integrated in the belt retractor Spring unit Pinion Guide drum Torsion bar Pawl Pawl spring Locking base Housing Lock gear Hook spring Retainer ma OONODOORWND AO Curriculum Training 1003 133 Fly wheel Sensor unit Pretensioner plate Ring gear Stopper spring Balls Gas generator Guide block Pipe Pretensioner cover Guide plate 02 39 Components Suppl Restraint System e The guide drum has a pinion on its end which rotates with the guide drum according to the movement of the belt The ring gear does not engage with the pinion during normal operation thus it does not rotate even when the belt is retracted or withdrawn 1003_134 1 Ring gear 3 Pinion 2 Guide drum e fthe belt pretensioner is triggered by a signal from the SAS module th
40. ion DU position Passenger Junction Box PAD indicator light SAS module Front airbag passenger side POND 02 48 PAD switch is at PASS AIRBAG OFF 00N 9 1003 144 A 1003 144 B Side airbag passenger side Belt pretensioner passenger side PASS AIRBAG OFF position PASS AIRBAG ON position PAD switch Current to ground Curriculum Training Suppl Restraint System Components PAD Retrofitting e f acustomer wants to have a PAD switch installed it is possible to retrofit the switch The necessary parts can be ordered for the Mazda2 as a kit and for the Mazda3 separate components NOTE Always observe your national legal requirements when retrofitting a PAD switch e When retrofitting a PAD switch on the Mazda2 work according to SI Service Information L004 03 NOTE NOTE Install the PAD switch Install the PAD indicator light Install the wiring harness only Mazda2 Perform the SAS module configuration using WDS Explain the operation of the PAD system to the customer Have the customer sign a declaration that he agrees to the installation of the PAD switch and that the operation of the PAD system has been fully explained Hand over one copy of the declaration to the customer and deposit the original copy in a safe place According to EU consumer protection legislation the dealership must retain the signed declaration for 10 years After installation of a PAD switch the
41. ion of type approval and vehicle safety standards 04 8 Curriculum Training Suppl Restraint System Diagnosis and Repair Troubleshooting Example e A customer brings his Mazda6 in the workshop with the complaint that the SRS warning light is illuminated permanently after it has flashed for a short period e Switch on ignition to reproduce the concern The light flashes DTC 19 for five times and then illuminates e Read out the DTCs of the SAS module Connect WDS to DLC 2 and after the vehicle identification select Toolbox gt Self test gt Modules gt RCM e DTC B1932 Driver airbag inflator no 1 circuit resistance high and DTC B2232 Driver airbag module inflator no 2 circuit resistance high are displayed as ODDTCs and CMDTCs see picture below NOTE To simulate this concern both connectors S1 06 between driver side airbag and clock spring cable have been disconnected Select Option Restraint Control Module Airbag ODDTCs Air Bag Driver Circuit Open B1932 RCM Possible Causes B2232 RCM Driver Side AirBag Circuit High Resistance or Open Circuit Airbag CMDTCs Suspect Integrated AirBag Diagnostic B1932 RCM Monitor Module Wiring fault Driver s AirBag B2232 RCM Li Please Check Connections 1003_S004 Curriculum Training 04 9 Diagnosis and Repair Suppl Restraint System the The next step is to find the description of the stored DTCs in the W M and to carry out respective troubl
42. ivated because they also protect the rear passengers e The system is factory installed on the RX 8 SE and can be retrofitted on Mazda2 DY and Mazda3 BK vehicles The system consists of the PAD switch and the PAD indicator light NOTE Unnecessary deactivation of the SRS components on the passenger side is dangerous If these are turned off the front passenger will not be protected by the SRS anymore Serious injuries or even death can be the consequence With the exception of installing a child restraint seat on the front passenger seat do NOT turn the airbag deactivation switch to the OFF position The driver will be held responsible for the intended use of the PAD switch e The following description explains the PAD system on Mazda3 BK vehicles 1003_143 1 PAD switch 3 SAS module 2 PAD indicator light Curriculum Training 02 47 Components Suppl Restraint System e The PAD switch can be operated with the aid of the ignition key Depending on the switch setting different terminals of the SAS module are connected to ground Based on this information the SAS module then decides whether the passenger side SRS components have to be switched off or on When the switch is at Passenger Airbag Off position the PAD indicator light will be illuminated and the SAS module will not trigger the accompanying components even if the vehicle is involved in a serious accident IG1 A PAD switch is at PASS AIRBAG ON posit
43. module The OBD system monitors the different SRS components for electrical faults If a fault has been detected this is displayed via the SRS warning light e Each malfunction is stored in a non volatile memory of the SAS module and may result in a deactivation of deployable SRS components In this case the driver is strongly requested to bring the vehicle to the workshop to have the system be repaired e The OBD system starts operating automatically when the ignition switch is turned to the ON position e Mazda currently uses three basically different OBD systems OBD system of the 1 SRS generation OBD system of the 2 SRS generation OBD system of the 3 SRS generation NOTE The OBD system of the 1 SRS generation has no memory function for past DTCs i e the SRS warning light only indicates present malfunctions The only Mazda model that still features this system is the B Series UN Since the introduction of the Mazda 323 BJ in 1998 each other SAS module is equipped with a memory function for past DTCs NOTE Always follow carefully the safety warnings and instructions stated in this training manual and in the respective W M while working on the SRS NOTE Each SAS module has a back up power supply to ensure the operation of the SRS system for a certain time in case the battery power supply is cut during an accident Condensers provide the back up power supply It is very important to deplete the back up power before
44. n 323 BJ POND 02 8 1003 165a Side airbag sensor no crash 5 Saving sensor SAS module not triggering 6 Signal control circuit Side airbag 7 Accelerometer Side airbag control circuit Curriculum Training Suppl Restraint System Components Side airbag sensor during side impact SAS module triggering the side airbag Side airbag Side airbag control circuit Saving sensor closed OO POND Curriculum Training OO CON OD 1003_165b Signal control circuit Accelerometer Current flow triggering the side airbag Side impact signal 02 9 Components Suppl Restraint System Clock Spring e The clock spring is a spiral ribbon cable located inside a housing between the steering wheel and steering column It serves as electrical connection between the driver front airbag and the vehicle wiring harness e When the steering wheel is turned the clock spring can wind up and unwind so that electrical contact constantly exists between the airbag and the SAS module 1003 149 1 Clock spring 2 Spring wire 3 Wiring harness Steering wheel Steering wheel turned to the left Steering wheel turned to the right OOP NOTE The clock spring must be properly aligned when servicing refer to W M Otherwise it can be easily damaged causing a malfunction of the SRS 1003 109a 1 Clock spring 3 Airbag connectors 2 Screw 4 Wiring harness connector 02 10 Curriculum Training
45. n the first 20 ms following the impact and serves as a supplement to the airbag which will be fully inflated after about 50 ms The deployment energy is controlled by the SAS module Therefore it varies the time delay for triggering the second stage depending on the input signals and stored map values If the SAS module decides that the best occupant protection is achieved when triggering only the first stage the second stage is nonetheless triggered for safety reasons with a delay of approximately 100 ms thus the rescue personnel is not endangered by an untriggered inflator The picture on the next page shows a possible sequence of the SRS operation during a frontal collision All values stated serve purely as an example 03 2 Curriculum Training 2 3 4 Suppl Restraint System Operation 1003_152 Driver 5 Airbags and pretensioners triggered seatbelt pretensioned Airbag inflated Immersion phase End of accident Time in milliseconds Front passenger Start of accident COND Note 100 ms 0 1 second one blink of an eye Side Impact If a vehicle is involved in such a serious side collision or a lateral rollover that the measured values of the accelerometers exceed the triggering threshold of the SAS module the relevant SRS components will be triggered by a signal from the module The relevant side airbag and curtain airbag are triggered simultaneously within 5 20 ms Thus they can be fully infla
46. normal condition CCNT_RCM DS1_STAT DS2_STAT PS1 STAT o Normal Normal Normal 2 60hm 2 7ohm Ee ii ez ii T T T T 1 10 75 6 26 o Driver Air Bag 2 Resistance y 1003_S005 e TO complete the repair delete the logged DTCs from the SAS module Then the DTC CCNT RCM will display 0 DTCs Curriculum Training 04 13 Diagnosis and Repair Suppl Restraint System SRS Component Replacement e Depending on the vehicle and the components that have been triggered during an accident the SAS module crash zone sensor and side airbag sensor have to be checked or replaced NOTE For the replacement of SRS components always refer to the procedures and service warnings in the W M The following description of the SRS component replacement only serves as additional information Side Airbag Sensor Replacement on the Mazda3 RX 8 e The side airbag sensors on Mazda3 BK and RX 8 SE vehicles have to be programmed by the SAS module after replacement If the programming procedure is canceled accidentally the sensor has to be replaced again e The following procedure explains how to replace a side airbag sensor on the Mazda3 1 Replace the side airbag sensor according to the safety instructions stated in the respective W M 2 Turn the ignition switch to the ON position for 5 s or more NOTE The programming procedure will be canceled accidentally if The ignition switch is not held in the ON
47. nts Suppl Restraint System Side Airbag e The side airbag protects the chest area of the front seat occupant during a side impact Therefore it uses the space between the occupant and the door trim If triggered from the SAS module it is inflated within 20 ms from the outer edge of the front seats where it is stored behind the trim e The side airbag has a volume of approx 8 liters Its layout depends on the vehicle type and specification The side airbag can either protect only the chest area or in addition the shoulder head of the occupant e The following description explains the construction and operation of the side airbag used on Mazda3 BK vehicles Similar systems are used on other vehicles NOTE A seat with a side airbag can be identified either by a patch SRS or by the letters SRS on the seat cover In both cases the information can be found on the outboard side of the seat NOTE If a seat is equipped with a side airbag it is prohibited to install a conventional seat cover or seat protector because this may change the direction of deployment Failure to follow this instruction can cause serious injury or death in case of airbag deployment Always use original or Mazda approved seat covers and seat protectors 1003_123 1 Side airbag module 3 Module cover 2 Inflator 4 Airbag 02 22 Curriculum Training Suppl Restraint System Components e The igniter build into the inflator begins to build up heat
48. or DTC Diagnostic Trouble Code ELR Emergency Locking Retractor HS CAN High Speed Controller Area Network OBD On Board Diagnostics PID Parameter IDentification RKE Remote Keyless Entry SAS Sophisticated Airbag Sensor Sl Service Information SRS Supplemental Restraint System Curriculum Training SCN SST VIN W D WDS W M List of Abbreviations SCAN Special Service Tool Vehicle Identification Number Wiring Diagram Worldwide Diagnostic System Workshop Manual 05 1
49. owest code NOTE The description of the DTCs and the recommended diagnostic procedures can be found in the respective W M 04 2 Curriculum Training Suppl Restraint System Diagnosis and Repair e The picture below shows an example of the flashing pattern for DTC 26 Malfunction of side airbag system on driver side It consists of two long and six short flashes 1003_160 1 ON 2 OFF Past Malfunctions e f a customer complains about a SRS warning light that has recently flashed but the fault is currently not present on the vehicle a past DTC might be stored in the SAS module To read out past DTCs connect terminal SCN SCAN in the DLC 1 to ground before the ignition is switched on The SRS warning light will illuminate for 4 8 s and then starts to display the two digit DTC as a corresponding flashing pattern 1003_161 SCN Terminal in DLC 1 Curriculum Training 04 3 Diagnosis and Repair NOTE Suppl Restraint System Delete the stored DTCs from the memory of the SAS module after the repair is completed Therefore 1 2 3 Turn the ignition switch to the ON position Wait until the SRS warning light illuminates approx 6 seconds and goes off Perform both the following steps alternately three times each at 0 5 1 0 seconds intervals Use a jumper wire to short the DLC terminal SCN to ground Disconnect the jumper wire from ground If the DTCs are displayed wait until they disappear
50. prox 12 19 liters and inflates within 15 30 ms after a side collision It stays inflated for up to a few minutes in order to protect the occupants even in case of a lateral rollover e The following description explains the construction and operation of the curtain airbag used on Mazda3 Bk vehicles Similar systems are used on other vehicles NOTE A vehicle with curtain airbags can be identified by the letters SRS on the trim of the A and C pillar 1003_125 1 Inflator 3 Airbag cover 2 Curtain airbag 4 Airbag 02 24 Curriculum Training Suppl Restraint System Components e When the curtain airbag is triggered by a signal from the SAS module the igniter builds up heat and ignites the inflammation agent Thus combustion gas is generated and the increased pressure breaks the sealing disc e The inert gas out of the pressure chamber expands and destroys the burst disc inflating the airbag via the diffusor orifice Thus the trims spread apart and the airbag is inflated between the head and shoulder area of the outboard occupants and the doors 1003 126 1 Igniter 6 Diffusor 2 Inflammation agent 7 Combustion of inflammation ageni 3 Sealing disc 8 Inert gas expansion 4 Combined gas 9 To airbag 5 Burst disc NOTE Inside the pressure chamber the gas is stored with a pressure of 300 bar Thus all damages to the housing are very dangerous Furthermore the high pressure requires additional accident prev
51. r Front AlDaAE EE dia ana ate dota dt de lat dea ata 02 13 Dual Stage Airbag cc nnneenneeee eee AA Ge ee 02 16 Passenger Front Airbags ss EE EG et EN aa aaa aa pt ai 02 18 System Using Highly Compressed Gas 02 19 slide 111012 6 EE eae RE N EER aa TANNA CEN TAN a ERE 02 22 Ga NAN Sis le Purnia ners A a tele dai ba biele a ta eta 02 24 Connectors in Trigger Circuit EE EE aana ERK aa eaaa tai retetei sat cele 02 26 SEMANA A ER EG E 02 27 Emergency Locking Retractor ss ee ee anane nenen aaa ee ee ee 02 29 ELR Release FUNCIONS EE AE ea RA ea ANAC Awa aa 02 31 Automatic LOCKING Retractor esa at a ace pe adi a 02 34 BEEP Tele SIO MG ARE EES ESE ENE TE a gaga a aa anaa aa 02 35 Rack Operated Belt PretensionerF ese ee nenea 02 36 Ball Operated Belt Pretensioner eeeceeeeeeneeeeeeeeeeeeeeeenteeeeeeeees 02 39 Rotor Operated Belt Pretensioner cccceeeceeeeeeeeeeeeeeeeeneeeeeeeees 02 41 Buckle Operated Belt Pretensioner ccceeeeeeeeeeeeeeeeeeeeeeeees 02 43 Belt Force LIMIGR RS DE RES SE DE ae pita al A la 02 45 Seatbelt Inspection ee RA nn ee ee ee ee 02 46 Passenger Airbag Deactivation System ee ees ee ee eee 02 47 PAD BEHOHING os tt Ee ta ee il at 02 49 Occupant Classification SyStem is cic issie EE ESE RE EER Re RE Ede e 02 50 Passenger Occupancy Detection System 02 50 Occupancy Classification System Used on Mazda Tribute Fac
52. rbag circuit e The PID PABAGR indicates a resistance of 2 1 ohm for the passenger airbag inflator no 1 circuit and the PID PS1 STAT displays Normal circuit status These PIDs have been selected to demonstrate the difference between a faulty and an intact circuit e The PID CCNT_RCM indicates the number of DTCs stored in the SAS module CCNT_RCM DS1 STAT DS2_STAT PS1 STAT 2 OPEN OPEN Normal D ABAGR2 25 Sohm EE belli III dl DABAGR 25 Sohm PABAGR 2 20hm SHC Et he il Driver Air Bag 2 Resistance 1003_S003 NOTE Never measure the resistance of any airbag with an ohmmeter to reproduce the measurement results above Measuring with an ohmmeter can trigger the airbag which may result in serious injury or even death Curriculum Training 0411 Diagnosis and Repair Suppl Restraint System e The next step is to inspect the connectors between SAS module and driver airbag starting from the airbag side Find the location of these connectors with the aid of the W D DRIVER SIDE AIR BAG MODULE INFLATOR NO 1 INFLATOR NO 2 1 CLOCK SPRING SHORT BAR SHORT BAR CLOCK SPRING S1 05 1 06 DRIVER SIDE AIR BAG MODULE CLOCK SPRING YELLOW HO BLUE 1003_155 Excerpts from Mazda6 W D 04 12 Curriculum Training Suppl Restraint System Diagnosis and Repair e After both connectors S1 06 of the driver airbag are re connected the corresponding PIDs display the
53. relevant information should be added to the service log of the vehicle Curriculum Training 02 49 Components Suppl Restraint System Occupant Classification Systems Passenger Occupancy Detection System e The PODS Passenger Occupancy Detection System is automatically controlled by the SAS module It deactivates the front airbag belt pretensioner and side airbag on the front passenger side when the seat is occupied with a load below a specified limit approx 12 kg or with a special Mazda child restraint seat with integrated transponder NOTE Curtain airbags cannot be deactivated because they also protect the rear passengers e The system consists of sensor mat with control module incorporated into the seat cushion and the PAD indicator light 1003 145 1 SAS module 3 Occupancy sensor 2 PAD indicator light 02 50 Curriculum Training Suppl Restraint System Components e The sensor mat incorporates a large number of pressure sensitive resistors These are connected to the control module which processes the individual signals and transfers them to the SAS module Furthermore one transmitting and two receiving antennas are also incorporated into the sensor mat and connected to the sensor module NOTE The sensor mat can only be replaced as a unit together with the seat cushion e The control module detects the load on the seat via the resistance of the sensor mat and sends a corresponding signal to the SAS module e W
54. retensioner is not integrated in the retractor it has to be replaced in addition to the seatbelt NOTE If the front airbags are triggered the belt pretensioners are triggered as well e Mazda uses four different types of belt pretensioners Rack operated belt pretensioner Ball operated belt pretensioner Rotor operated belt pretensioner Cable operated belt pretensioner e The different types of the belt pretensioners that are explained on the following pages serve only as an example The layout of the systems can vary but the construction and operation is similar to those that are explained Curriculum Training 02 35 Components Rack Operated Belt Pretensioner Suppl Restraint System e The belt pretensioner with rack and pinion design is integrated in the belt retractor OaRWND 02 36 Guide drum Piston with rack Rubber plate Cover Pinion Piston stopper 1003_130 Housing Gas generator Housing Spindle Bearing Pretensioner mechanism Curriculum Training Suppl Restraint System Components e The piston is usually fixed by the piston stopper and is therefore completely separated from the movement of the pinion The pinion is connected to the spindle running through the center of the guide drum and rotates freely according to the movement of the belt 1003 131 1 Belt 4 Piston with rack 2 Pinion 5 Spindle 3 Piston stopper 6 Guide drum Curriculum Training 02 37 Components Suppl Restra
55. riggered about 10 ms after a front impact while the curtain airbag and side airbag are triggered about 3 ms after a side impact The SAS features an integrated back up power supply to provide the system with power even if the vehicle power supply should fail e g if the vehicle battery should be disconnected in an accident This back up power supply ensures the SRS operation for at least 150 ms after the vehicle power supply is interrupted If the SAS module decides to trigger SRS components it sends a corresponding AC Alternating Current or DC Direct Current signal depending on the vehicle type to the respective component The SAS module is equipped with a DTC Diagnostic Trouble Code memory and features the possibility to diagnose the system with the aid of the WDS Worldwide Diagnostic System via the DLC 2 Data Link Connector or via the DLC 1 depending on the vehicle type and the SRS warning light Curriculum Training 02 1 Components Suppl Restraint System NOTE The mounting bolts of the SAS module must always be tightened to the specified torque in the compulsory sequence refer to W M Ensure that the module is correctly aligned otherwise the measurement results for the acceleration might be affected causing a malfunction of the SRS 1003_107 1 Bolt 3 SAS module 2 Connector 02 2 Curriculum Training Suppl Restraint System Components SRS Warning Light e The SRS warning light is located in the instrum
56. s with side airbags and or curtain airbags They are mounted close to each B pillar in order to determine severity of a side impact The Tribute EP FL Face Lift is equipped with an additional side airbag sensor at each C pillar to ensure optimum protection for the occupants even if a side impact occurs at the rear of the vehicle The additional sensor is necessary because of rotation of the vehicle about the vertical axis an impact in the rearward area of the vehicle would not be recognized by the front side sensors e ltincorporates an accelerometer and is connected to the SAS module e Mazda uses two different types of side airbag sensors One type features an integrated saving sensor and triggers the corresponding side airbag directly via the SAS module The other sensor type detects the impact severity and sends a corresponding signal to the SAS module where then the decision is made whether or not the corresponding side curtain airbag have to be triggered NOTE The bolt of the side airbag sensor must always be tightened to the specified torque refer to W M Ensure that the sensor is correctly aligned otherwise the measurement results for the acceleration might be affected causing a malfunction of the SRS 1003 109 1 Connector 3 Bolt 2 Side airbag sensor Curriculum Training 02 7 Components Suppl Restraint System e The picture below shows a functional overview of a side airbag sensor with integrated saving sensor used o
57. substance which is used by the airbag manufacturers to keep the cushion pliable and prevent it from sticking while it is stored NOTE Powdery substances which are remaining after airbag deployment can be toxic residues of propellant Thererfore always follow the corresponding safety instructions Curriculum Training 02 15 Components Suppl Restraint System Dual Stage Airbag e The construction and operation of a dual stage airbag is similar to a conventional airbag except for the fact that it features two inflators as described on the following pages e A dual stage airbag provides the ability to customize the inflation depending on the severity of the accident This feature reduces the risk of serious injury caused by the deploying force of the airbag in case of an accident Therefore the SAS module varies the timing for triggering both stages thus varying the deployment energy of the airbag If it is necessary that the airbag must be fully inflated the second stage is triggered simultaneously with or immediately after the first stage If the SAS module decides that a fully inflated airbag could cause more injury than protection it delays the triggering of the second stage e The deployment energy for both stages depends on the vehicle As an example the energy distribution on Mazda6 vehicles is 60 for the first stage and 40 for the second stage NOTE If it is necessary to deploy only the first stage of the dual stage airbag
58. t be positioned on the seat as they might cause unintentional activation deactivation of the passenger airbag system resulting in serious injury or death in case of an accident 1003_ 146 1 Transponder 1003 172 1 Plastic housing 3 Wire wound coil 2 Coil carrier 4 Integrated circuit 02 52 Curriculum Training Suppl Restraint System Components e The table below gives an overview of the PODS functionality Condition Passenger front airbag side airbag and belt pretensioner will not be triggered No load Low load High load Child restraint seat without transponder on passenger front seat Child restraint seat with transponder on passenger front seat Child restraint seat without transponder on passenger front seat Child restraint seat with transponder on passenger front seat Passenger front airbag side airbag and belt pretensioner will be triggered if necessary PAD indicator light illuminated Occupant Classification System Used on Mazda Tribute Facelift e The PODS of the Mazda Tribute Facelift consists of a seat weight sensor seat weight sensor control module belt tension sensor and a PAD light The system provides information regarding the passenger s weight and the belt tension to the SAS module which can have an influence on the triggering strategy of the passenger airbag NOTE It is prohibited to use a child restraint seat on the passenger fron
59. t seat refer to the owners manual Curriculum Training 02 53 Components Suppl Restraint System e The seat weight sensor incorporates a silicone filled cushion which is connected to the sensor via a hose The silicon varies the pressure acting on the seat weight sensor according to the load on the seat Thus the sensor is able to send a load signal to the seat weight sensor control module from where it is transmitted via a separate HS CAN High Speed Controller Area Network bus to the SAS module The module can then use this information to influence the triggering strategy of the passenger airbag NOTE The seat weight sensor and the seat weight sensor control module are calibrated to each other and may only be replaced as a unit NOTE The seat weight sensor must be reset with the aid of the WDS after it has been replaced or the seat trim cushion has been removed Therefore connect the WDS and select Toolbox gt Body gt Restraints gt Seat Weight Sensor ReZero to reset the seat weight sensor 1003_147 1 Silicon filled cushion 3 Seat weight sensor control module 2 Seat weight sensor 4 Underlay for silicone filled cushion 02 54 Curriculum Training Suppl Restraint System Components e The system also features a belt tension sensor which is integrated in the lower belt anchor point It detects the belt tension and sends an equivalent signal via the seat weight sensor control module to the SAS module When a load
60. ted after approx 15 ms following the impact The side airbag stays inflated for approx 100 ms while the curtain airbag stays inflated for up to a few minutes Thus it can protect the occupants head and shoulder even in case of a rollover Curriculum Training 03 3 Suppl Restraint System Operation Wiring Diagram F AN aa an PET eee ao e e ooo fo RE AAA ARE ST Tot AA EES EEUE KA pp ozo Sze Sze Sze SES o ozo 001001000 01000000E000000H0 ec ii RA d d e ol fd le t i N aa kah O Orre sa DO OD I OX j mi 1003_154 Curriculum Training 03 4 Suppl Restraint System IG1 PJB Crash zone sensor Twisted pair PAD indicator PAD switch PASS AIRBAG ON PASS AIRBAG OFF Driver buckle switch 10 Driver side airbag sensor 11 Passenger side airbag sensor 12 CAN bus 13 Instrument cluster OO ONOOU POND Curriculum Training Operation SAS module Clock spring Driver front airbag Inflator No 1 Inflator No 2 Passenger front airbag Driver pretensioner Driver side curtain airbag Driver side airbag Passenger pretensioner Passenger curtain airbag Passenger side airbag 03 5 Operation Suppl Restraint System Notes 03 6 Curriculum Training Suppl Restraint System Diagnosis and Repair Diagnosis and Repair On Board Diagnostic System e All Mazda SRS are equipped with an OBD On Board Diagnostic system that is integrated in the SAS
61. the SAS module e lfthe seat is moved forward the metal rod acts as a blind in the gap of the sensor and the sensor signals a corresponding signal to the SAS module Pe Se ee SS SF TAI OKO 1003_167 1 Hall element type sensor 3 Blind 2 Gap 02 12 Curriculum Training Suppl Restraint System Components Driver Front Airbag The driver front airbag is designed to slow down the driver s speed to zero in case of an accident Therefore gas inflates a cushion between the driver and the steering wheel to reduce the driver s forward movement in a controlled manner and prevent the driver from crashing onto the steering wheel The cushion itself which is made of thin nylon fabric is folded and stored behind the center cover of the steering wheel The cover has tear lines molded in its surface allowing the airbag to easily exit through the cover when it is triggered The airbag incorporates an inflator that is connected to the SAS module If triggered gas is generated within the inflator and inflates the airbag to protect the driver The driver airbag has a volume of about 45 liters and is inflated within 40 60 ms after a frontal collision The noise generated by the airbag deployment is approx 130 dB A However because of the short duration of approx 3 ms a hearing defect is unlikely Mazda uses two different types of driver front airbags Single stage airbag Dual stage airbag The following des
62. ts ELR Release Function e The RX 8 SE features an ELR release function This is necessary due to the fact that on the RX 8 the seatbelt retractors for the front seatbelts are installed in the rear doors In order to open the rear doors completely the seat belt webbing has to unwind from the guide drum even when the vehicle is tilted e The ELR release function is controlled by the RKE Remote Keyless Entry module and only inhibits the locking of the guide drum due to a tilted position of the vehicle The seatbelt will always lock when the webbing is quickly unwound from the reel e The picture below shows an overview of the components 1003_168 1 Remote Keyless Entry module 6 Ball 2 Rear door upper latch switch 7 Front door switch in rear door 3 Actuator 8 Rear door lower latch switch 4 Lock release solenoid 9 Front seatbelt retractor 5 Cancel lever 10 Front buckle switch Curriculum Training 02 31 Components Suppl Restraint System e The wiring diagram below shows the condition with all doors open and seat belts not buckled The lock release solenoids are actuated in this condition by current flowing from the RKE module via the respective switches to ground B D 2 p B 3 a H H H HG OL LO OL LO 1003_175 1 Keyless unit 7 Rear door lower latch switch left side 2 Front buckle switch right side 8 Rear door upper latch switch left side 3 Lock release solenoid right side 9 Front door switch left
63. you start disconnecting or measuring on any circuit Follow the specific instructions stated in the W M regarding the depletion of the back up power Failure to follow those instructions may result in personal injury or even death Curriculum Training 04 1 Diagnosis and Repair Suppl Restraint System OBD System of the 2 1 SRS Generation e The OBD system of the 2 SRS generation comprises the following features Malfunction detection function Display function to indicate present and past malfunctions as two digit DTCs via the SRS warning light DTC memory function for present and past malfunctions Diagnosis via DLC 1 Fail safe function to prevent the accidental activation of SRS components in case of a malfunction e The OBD system of the 2 SRS generation is used in the following vehicles MX 5 NB MPV LW and Premacy CP Present Malfunctions e When the SRS warning light flashes or illuminates the OBD system has detected a present malfunction and thus outputs a corresponding DTC This DTC is also stored in the SAS module and will not be deleted when the battery is disconnected e Toread out present DTCs the ignition must be switched on Then the SRS warning light will illuminate for 4 8 s before it starts to display the two digit DTCs as a corresponding flashing pattern e lfthe OBD system has detected more than one malfunction the stored DTCs are displayed consecutively beginning with the l

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