New Front Suspension System Factory Alignment Contents How
Contents
1. Mark Stesney GM com Technical Editor J im Horner lt im Horner SandyCorp com 1 248 816 3641 Production Manager Marie Meredith Desktop Publishing Greg Szpaichler MediaW urks pake mediawurks com FAX number 1 248 649 5465 Write to D lt TechLink PO Box 500 Troy MI 48007 0500 GM TechLink on the Web http service gm com General Motors service tips are intended for use by professional tech nicians not a do it yourselfer They are written to inform those techni cians of conditions that may occur on some vehicles or to provide informa tion that could assist in the proper Service of a vehicle Properly trained technicians have the equipment tools Safety instructions and know how to do a job properly and safely If a con dition is described do not assume that the bulletin applies to your vehi cle or that your vehicle will have that condition See a General Motors deal er servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information Inclusion in this publication is not nec essarily an endorsement of the indi vidual or the company Copyright 2001 General Motors Corporation All rights reserved Return to page 1 continued from page 7 sion is installed Traditionally the front end is aligned as the parts are installed For 2002 the front end is pre posi tioned during chassis build and final alignment is don2. RPO E37 01 08 61 004 Corrosion of Side Assist Step Brackets and Assist Step Trailer Connector Fasteners Replace Fasteners Install Bracket Shields 2000 01 GMC S T J immy Models With Diamond Edition Appearance Package RPO J DE 01 08 64 008 New Style Water Deflector 2000 2001 Chevrolet Impala 01 08 64 009 Door Rattle with Moderate to High Audio System Volume Insulate Door Components 1997 2001 Chevrolet Corvette 01 08 66 005 Availability fo Pickup Box Reinforcement Kits for Toolbox Rear Window Barrier Ladder Rack Applications 1999 2001 Chevrolet and GMC C K Pickup Models With Fleetside Pickup Box RPO E63 01 08 66 006 Chevrolet Avalanche Cargo Area 2002 Chevrolet Avalanche RESTRAINTS 01 09 40 001 Replacement Front Seat Belt Retractor and Buckle Usage 1999 2002 Chevrolet and GMC C K Pickup Models 2000 02 Chevrolet and GMC C K Utility Models 2002 Cadillac Escalade 01 09 40 002 Seat Belt System Replacement Guidelines for Vehicles Involved in Collisions 2002 and Prior Passenger Cars and Trucks Return to page 1
3. Service gm com Here s how to check the status of your TIS 2000 Start with the desktop displayed on your Techline terminal Locate the T1S2000 application logo and click When TIS 2000 opens locate the tool bar at the top of the screen Locate Help and click This opens a pull down menu Locate About TIS 2000 and click This lists the following information typi cal numbers shown in example Block Point 13 Data Version 7 0 21 005 Once you have located the version num bers you can compare them with the num bers in the electronic TIS 2000 newsletter found under the same Help screen men tioned above If you do not have the latest version of TIS 2000 installed on your Techline Terminal it can be downloaded from the service gm com website Thanks to Holly Shaw Tech 2 Version Update J 45080 32MB Card for Tech 2 In the April issue of TechLink you read about the new J 45080 32MB card for your Tech 2 This new card provides 3 times the storage capacity of the origi nal card to accommodate present and future diagnostic and programming applications Since that time you should have received your card It was sent out in a two part container shown in the photo The outer brown bubble wrap envelope contains an inner protective cardboard Sleeve Be sure to insert the new 32mb card in the Tech 2 slot 0 closest to the screen The first time you update the new card you will need
4. adult seat belt systems but built in child restraints and LATCH system components if any Replace any seat belt sys tem if you observe the words REPLACE or CAUTION or if a yellow tag is visible Do not replace a seat belt system if only the child seat caution label is visible Replace any seat belt sys tem if you are doubtful about its condition This not only includes adult seat belt systems but built in child restraints LATCH system components and any restraint system used to secure infant carriers child restraints and booster seats Do NOT replace single seat belt system components in vehi cles that have been in a collision as described above Always replace the entire seat belt sys tem with the buckle guide and retractor assembly which includes the latch and webbing material After a minor collision where no automatic restraint device was deployed seat belt system replacement may not be neces sary unless some of the parts are tom worn or otherwise dam aged The only way to know if a seat belt was in use is to ask the dri ver operator Thanks to J erry Garfield LATCH is the industry standard acronym for the built in child restraint securing system Lower Anchorage s and Top Tethers for Children LATCH consists of the top strap anchors in the vehicle as well as the built in receivers for LATCH equipped aftermarket child restraints 5 Return to page 1 Steering Colu
5. it arbitrarily or unnecessarily Be sure to check the obvious when analyzing the customer concem before changing any factory settings Factory Alignment During chassis assembly the suspen continued on page 3 Volume 3 No 8 New Levels of Precision in Wheel Alignment Wheel alignment is a traditional customer concern fre quently mentioned on J D Power surveys as a customer dissat isfier Unsatisfactory alignment shows up as customer con cerns such as abnormal tire wear and handling discrepancies for instance pulling or poor tracking Customers also comment if the steering wheel is angled when the vehicle is going When the 2002 TrailBlazer Envoy and Bravada were in the planning stages engineering identified improving factory align ment as an important goal New Front Suspension System The clean sheet of paper thinking began with an all new front suspension design It follows the previous front suspen sion in using upper and lower control arms but the resem The upper control arm attaches to the chassis with two bushings and to the steering knuckle with a ball joint There Contents GMI Service Operations continued from page 7 downloaded to your Techline terminal auto matically But if there is a system malfunc tion during the broadcast your terminal may not contain the latest version For stand alone customers the latest version of TIS 2000 Is also available from the GMSO web site
6. to use the Custom Mode of TIS 2000 because of Startup software on the card For later updates use the standard procedure If you have multiple cards to update the card copy function can be used to update the additional cards once the first card has been updated TIP Be sure you have the most cur rent TIS 2000 software when doing the update Thanks to Mark Stesney SI 2000 Timesaver Tip When you re looking at any SI 2000 page particularly a long one here s how to search for a term on the page Say you re on a wiring schematic and you need to locate a specific circuit Here s how On the Intemet Explorer toolbar locate the EDIT button and click Then in the dropdown menu locate Find on This Page and click In the dialog box type the word or term you re looking for You can limit or expand the search by checking the M atch whole word only or M atch case buttons Then click Find Next and you will be taken to the first place the term appears on that page Click Find Next as many times as needed to locate the usage you re looking for Thanks to Lisa Scott GM TechLink is a monthly magazine for all GM retail technicians and service consultants providing timely information to help increase knowl edge about GM products and improve the performance of the service department This magazine is a companion to the GM Edge publication Publisher amp Editor Mark Stesney GM Service Operations
7. 009 Refrigerant Dye Added to A C System at Assembly Plant All 2001 Passenger Cars 2002 Chevrolet Tracker 01 01 38 008 Heating Ventilation and Air Conditioning HVAC Normal Operational Characteristics 1999 2002 Chevrolet Tracker 01 01 38 009 Wet Carpet Odor in Passenger Foot Well Area Repair Evaporator Case Drain to Cowl Seal Open Evaporator Case Drain 2002 Buick Rendezvous 2001 Chevrolet Venture Oldsmobile Silhouette Pontiac Aztek Montana STEERING 01 02 32 005 Whine Noise From Power Steering P S System During Vehicle Start up at Low Ambient Temperatures Flush Bleed P S System Change P S Fluid 2002 Chevrolet and GMC S T Utility Models Oldsmobile Bravada With 4 2L Engine VIN S RPO LL8 DRIVELINE AXLE 01 04 17 001A replaces 01 04 17 001 Launch Shudder On Acceleration Install New One Piece Propeller Shaft 1999 2001 Chevrolet and GMC K2500 3500 Extended and Crew Cab Long box Pickup Models with Automatic Transmission ENGINE PROPULSION SYSTEM 99 06 03 010A replaces 99 06 03 010 DTCs B1001 B1271 or B1780 Set When Replacing Reprogramming Other Modules 1999 2002 All Passenger Cars and Trucks With Class 2 Serial Data Communication Between Modules 01 06 01 017 Flywheel Holding Tool J 44226 3A Modification or Replacement 2002 Chevrolet and GMC S T Utility Models 2002 Oldsmobile Bravada with 4 2L Engine VIN S RPO LL8 01 06 04 033 Various Driveability Symptoms Malfunct
8. 5 mm foam Thanks to Ray Romeo Old style panel top New style panel bottom Return to page 1 TAC OnStar Static Owners of 1998 and 1999 Cadillac Sevilles with the OnStar VS P handset system may experience a clipping type of static noise in handsfree mode Audio performance through the handset will be normal Clipping static should diminish as volume is decreased This condition is caused by the wrong configuration interface in the OnStar application Have the vehicle reconfigured with a configuration inter face of PAI GM Technical Assistance Y Howl Noise On the 2002 TrailBlazer Envoy and Bravada a noise similar to a rear axle howl may be heard This condition may be caused by the roof rack slats being positioned together On units equipped with roof racks separate the roof rack slats before diag nosing a concern for a rear axle howl GM Technical Assistance v Oil Change Light Flashes After Reset On some 2001 Chevrolet and GMC pickup and SUV models the Oil Change Light may continue to flash even though reset instructions are followed If you are certain that you have properly followed the Oil Light reset procedure cycle the ignition key 15 times This should reset the light GM Technical Assistance Y Rendezvous M emory Seat Will Not Recall Or Recalls Exit Setting The customer may comment that when using the RKE fob the driver seat does not recall to the M emory posi
9. arly the technician under stands the concern and its symptoms the more likely the con dition will be fixed right the first time GM Service Operations is releasing a revised Diagnostic Worksheet based on input from GM Technical Assistance ser vice engineers service manual writers and a select group of retail dealer service directors The new diagnostic aid stream lined to a single sheet reflects today s product without sacrific ing content Service Consultants should use the Diagnostic Worksheet to help capture a better description of the customer concem Technicians find these very helpful in completing quality repairs more efficiently They are also helpful in reducing shop come Dayt ime Running Lights Disable Qualifications and Process In GM Service Operations continuous effort to pro vide the fastest customer support possible the follow ing process is in effect for those select governmental agencies that request and qualify for disabling Daytime Running Lights DRL 1 All requests are to be made through the Techline Customer Support Center TCSC at 1 888 337 1010 US or 1 800 828 6860 Canada 2 Only the following governmental agencies qualify for this disable request City State Government Police Shenff Departments FBI CIA DEA and emer gency vehicles if government owned 3 The Dealership will be required to obtain a letter on official agency letterhead requesting the disable and Stati
10. cement 1995 1999 Chevrolet Cavalier and Pontiac Sunfire 01 08 50 005 Second Row Easy Entry 40 Rear Seat Will Not Unlock or Release Replace Latch Assembly 2001 Chevrolet and GMC C K Models with Second Row Easy Entry 40 Seat RPO AT5 01 08 52 002A replaces 01 08 52 002 Programming Remote Keyless Entry RKE Transmitters 2001 Chevrolet M alibu Oldsmobile Alero Pontiac Grand Am 01 08 56 001A replaces 01 08 56 001 Security Lamp Illuminated on the IP Engine Stalls No Start DTC B2960 Security System Sensor Data Incorrect but Valid Set Inspect and Repair Cause of DTC B2960 1998 2001 Chevrolet and GMC S T Pickup and Utility M odels Oldsmobile Bravada 01 08 56 002A replaces 01 08 56 002 Security Lamp Illuminated on the IP Engine Stalls No Start DTC B2960 Security System Sensor Data Incorrect but Valid Set Inspect and Repair Cause of DTC B2960 1999 2001 Chevrolet and GMC C K Pickup and Utility M odels 01 08 56 003A replaces 01 08 56 003 Security Lamp Illuminated on the IP Engine Stalls No Start DTC B2960 Security System Sensor Data Incorrect but Valid Set Inspect and Repair Cause of DTC B2960 1999 2001 Chevrolet and GMC M L Van Models 01 08 60 001 Availability of Repair Kits and Paint for Structural Reaction Injection M olding SRIM Composite Box 2002 Chevrolet Avalanche End Gate and Box Front Inner Panel 2001 Chevrolet and GMC C K Pickup Models Box with Composite Pickup Box
11. e automatically when the vehicle is complete Near the end of the assembly line you ll find a non contact alignment device built by FORI Automation It s used to set final alignment on each truck And according to David Risner Alignment Coordinator at Moraine Assembly This is the most precise Upper and Lower Control Arms process used to date This machinery is calibrated at the beginning of each shift so the results are repeatable 02 degree Before attempting a realign ment job bear in mind that it would take a highly skilled technician using a perfectly calibrated alignment bench plus a lot of skill and a little luck even Coil Over Shock M odule or a to match much less outperform the FORI system Here s how the system works As you ve probably guessed it involves a lot of computing power Plus lasers and robotic camera eyes Each vehicle is tagged with a bar code which contains the vehicle s spe cific VIN By scanning the bar code FORI can recognize and account for dif ferent models equipment and options For instance it recognizes various tire sizes and even whether the vehicle has coil springs or air springs in the rear Suspension As a vehicle is positioned in the FORI station the lasers and cameras orient the equipment to the vehicle And a steering wheel leveler is attached to the steering wheel Then the computers take over and the mea surements begin wi
12. e of electrical tape on the Shaft of the tool will help avoid damaging the plastic parts Hold the screwdriver stationary and pull the sunshade downward and rotate with enough force to duplicate the visual appear ance in the photograph Rotate about 4 inches toward the rear of the vehicle The first lock will be heard or felt when it unlocks This will free the first lock from the Screwdriver in slot bezel on the headliner Push the visor to the headliner while maintaining the screwdriver in the correct position and continue rotating the visor toward the side window Pull the retainer from the bezel and disconnect the electrical wires if equipped with lighted visor vanity mir rors Thanks to J eff Downing and David Risner If the recommended removal does not work it will be necessary to destroy the visor pivot Use a 3 8 inch drill bit to drill out the pivot as shown in the photo This will destroy the triangular lock in the bezel Then rotate the visor toward the side window to remove the pivot from the Emergency removal using 3 8 inch drill bezel Obtain a replacement visor and bezel and install Thanks to Wayne Zigler Bezel on left showing drilled out triangular lock Return to page 1 Using the Diagnostic Worksheet In your dealership s service department one of the most dif ficult and critical lines of communication is from the service cus tomer to the technician The more cle
13. ect removal pro cedure or the incorrect tools you will break the visor or cause cosmetic dam Pivot slot aligned with visor slot age to the plastic parts Bulletin 73 16 18 was released on this subject several years ago and will soon be revised and re released The correct procedure is alSo spelled out in detail in SI 2000 Follow this path Build the vehicle Body and Accessories Interior Tim Repair Instructions Sunshade Replacement Here are the highlights Alignment Concerns The FORI system will deliver quality settings According to GM Brand Quality M anager J eff Downing If a customer expresses an alignment relat ed concern realignment is not the logi cal best place to start First check the simple things tire pressure road crown and damage caused by impact to the vehicle If an alignment is performed be Sure your equipment Is precisely cali brated before beginning The repair order hard copy should contain the before settings actually observed and the corrected after setting Repair orders will be requested through the WPC and compared with the plant set tings and specifications Fold the sunshade straight down unlatch it and position the end just rear ward of the clip toward the rear of the vehicle aligning the pivot slot and the visor Slot Locate the slot in the sunshade retainer on the shaft and insert a 1 4 inch flat bladed screwdriver A piec
14. er parts of the cooling system This may be caused by sealer pellets added to the coolant at assembly to sufficiently seal possible minor coolant leak concerns This is a normal condition and no service is nec essary GM Technical Assistance Y QuickTIP Using a Vacuum Gauge to Diagnose Fuel Systems on Duramax Diesel LB7 Engines All Chevrolet and GMC dealer ships received an essential tool J 44638 Vacuum Gauge It is to be used to diagnose the supply side of the 6600 Duramax Fuel system Some gauges may have been shipped with the connections of the gauge and valve connector loose on the flexible hose This condition could cause an incorrect diagnosis of the fuel system Please inspect your gauge to be sure all connec tions are tight and sealed with Teflon based sealant Teflon tape is not recommended Thanks to Bill Carnevale Return to page 1 July 2001 This review of service bulletins released through mid uly lists the bulletin number Superseded bulletin number if applicable Subject and models GENERAL INFORMATION 01 00 89 008A replaces 01 00 89 008 Recreational Dinghy Towing Numerous Specified Vehicles 1995 2002 01 00 89 010 replaces 58 01 01 Information on Use of Diagnostic Worksheet 2002 and Prior Model Year Passenger Cars and Trucks 01 00 89 011 New Technical Assistance Information Form 2002 and Prior Passenger Cars and Trucks HVAC 00 01 38 009A replaces 00 01 38
15. ion Indicator Lamp MIL Iluminates Intermittently DTCs Set Blown Fuses Repair Wires and Secure IP Harness 2001 Chevrolet Venture Oldsmobile Silhouette Pontiac Montana Between VIN Breakpoints Specified 01 06 04 034 Engine RPM Limited to 3000 RPM and No Cruise Control Check Wiring and NSBU Switch 2001 Chevrolet and GMC C K Pickup Models with 8 1 L Engine VIN G RPO L18 and Allison Automatic Transmission RPO M 74 01 06 04 035 Non Serviceable Connectors on the Fuel Injector Control Module Hamess for the Duramax 6600 Diesel Engine 2001 Chevrolet and GMC C K Models 2500 HD and 3500 with 6 6L Engine VIN 1 RPO LB7 01 06 04 036 Diagnosing Fuel Gauge Reading Empty Low Fuel Message Displayed DTCs Set 2000 01 Chevrolet and GMC C K Utility Models with Dual Fuel Tanks 01 06 125 001 Battery Charger Inoperative Check Vehicle Displayed on Battery Charger Reprogram BPCM 1997 1998 Chevrolet S 10 Electric Truck with Panasonic TP 6 Lead Acid Battery Pack TRANSMISSION TRANSAXLE 01 07 29 004 replaces 72 05 08B Corvette ZF Six Speed M anual Transmission Service 1989 1996 Chevrolet Corvette with ZF Six Speed M anual Transmission RPO ML9 01 07 30 023 Harsh 1 2 Upshift and Possible Diagnostic Trouble Code DTC P1870 Replace Valve Body various 1996 2000 Cars and Trucks with 4L60 E Automatic Transmission RPO M 30 BODY AND ACCESSORIES 01 08 49 009 Revised Instrument Panel Cluster IPC Repla
16. lly although it has nothing to do with alignment data this is a con venient time for a test of the audio equipment Again by scanning the bar code FORI knows exactly what audio equipment is present The FORI com puter communicates with the audio receiver in the vehicle through the ALDL connector The equipment that holds the steer ing wheel straight for the alignment process also contains a microphone The FORI computer causes a signal to be sent to the radio from an extemal antenna Each speaker in tum responds Laser image on sidewall and the sound is picked up by the microphone This checks speaker performance and checks for pinched wires and other problems The entire time the vehicle spends in the FORI station amounts to a mere 2 1 2 to 3 minutes As a final step a continued on page 4 FORI Inspection Station BRACKET _ BOLT SOCKETS Return to page 1 New Levels of Precision in Wheel Alignment print out is created showing the actual alignment results and it s attached to plant records Steering Wheel Leveler with Microphone There are several methods of attaching Sunshades sun visors to vehicles The traditional one uses two or three screws to retain the pivot A different design uses a retainer on the shaft that engages the bezel on the headliner This design is used on 1997 to current Buick Century and Regal and 1998 to present Oldsmobile Intrigue If you use the incorr
17. mn Attachment Here s a tip that can save you a lot of aggravation when servicing the following vehicles 1997 Current Park A venue 1998 Current Seville 2000 Current Bonneville and LeSabre 2000 DeVille 2001 Aurora On these cars the steering column is attached to the magnesium instrument panel beam with three piece fasteners Steering column fastener consisting of a headless stud a square nut at the top and a conventional nut at the bottom The square nut fits into a Square depression in the magnesium beam and the steering column is installed onto the stud Then a nut is driven onto the stud retaining the steering column Depending on carline there may be four or six of these studs Steering column fastener installed in mag beam If the steering column needs to be lowered follow the instructions in SI2000 including precautions regarding the handling of the airbag and steering column Also be sure to install J 42640 Steering Column Lock Pin into the steer ing column access hole in order to lock the steering column But when you loosen the steering column fasteners DO NOT simply loosen the retaining nuts In many cases the nut and stud come out as a unit leaving the square nut stranded in the depression on the top side of the mag beam Then when you attempt to install the stud the square nut will be pushed out of position It may then be necessary to loosen and move the instrument
18. ng the reason The letter must also include the spe cific VIN S which will be disabled and this statement The DRL Auto Headlamp system will be made fully operational prior to disposal sale of the vehicles listed above The letter must be kept in the service history file at the Dealership and a copy sent to TCSC before the dis able procedures will be released In most cases the vehicles will require a software change that requires a Special VCI override Thanks to Bob Savo backs aiding in customer loyalty The GM Diagnostic Worksheet is available in pad form from Reynolds amp Reynolds at 1 800 344 0996 Thanks to Chuck Bums Seat Belts An Update M ust seat belts be replaced after a collision Depends This is what is in SI 2000 service manu als now that will answer the ques tion CAUTION Restraint systems can be damaged in a collision To help avoid injury and ensure that all parts in need of replacement are replaced Replace any seat belt sys tem that was in use during a collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners This not only includes seat belt systems in use by people of adult size but seat belt systems used to secure child restraints infant carriers and booster seats including LATCH system and top tether anchorages Replace any seat belt sys tem that has torn worn or damaged components This not only includes
19. nunnan s s s sssss7s gt 5 ate eee eS Pig How Current is Your TIS 2000 Having the latest version of the Techline Information System TIS 2000 installed on your Techline terminal is cnt ical when you need to use your Tech 2 to program a vehicle s Powertrain Control Module PCM GM Service Operations broadcasts a new version of TIS 2000 over GM ACCESS every two weeks As long as your dealership s GM ACCESS system is functioning properly this data will be _ er E continued on page 2 straight blance stops there kine are no adjustments on the upper control arm The lower control arm pivots from an adjustable bracket which is attached to the subframe with three bolts The steer ing knuckle attaches with another ball joint The major difference though is the use of a coil over shock module which joins the lower control arm to the frame To minimize complexity and aid in com monizing procedures and parts the same Suspension is used on both 2wd and 4wd vehicles Front wheel alignment involves check ing and setting caster camber and toe Only the three bracket bolts and toe jam nuts are involved For caster and camber all you ll need is a pry bar no special tools are required Setting toe is accomplished by the conventional method of adjusting tie rod length But once you understand how the suspension is aligned in the factory you may have second thoughts about realigning
20. panel to gain access to the square nuts 13 mm Crowfoot NO 7 Torx Here s the proper method for loosen ing the nuts First install a 13 mm crow foot wrench to the nut Then install a number 7 inverted Torx socket to the bottom of the stud Use the Torx socket to hold the stud while you loosen the nut with the crowfoot wrench This prevents the stud from unscrewing from the Square nut Now when you lower the steering column the stud and square nut remain in position on the magnesium beam When you install the steering column torque the retaining nuts to 27 N m 20 Ib ft Thanks to J im Haist Front Carpet Passenger Side Water Leak Owners of some 1999 2001 Alero and Grand Am models may comment Location of foam about a mildew odor windshield fogging or wet carpet on the passenger side And in ambient temperatures below 32 F the blower may not operate due to Ice The foam water dam under the black beauty panel may be mis positioned missing or not adhered properly On vehicles with foam mis positioned or not adhered properly Remove and discard the original foam part Clean the metal surface with an alcohol based cleaner Install the new part properly center ing the part over the HVAC air intake opening On vehicles built without a foam dam and old style beauty panel Install 18 mm foam On vehicles with no foam or with 18 mm foam and new style beauty panel Install 2
21. th the wheels slow ly rotating For toe and camber a laser creates images on the sidewall of the tire and this is read by the cameras The com puter establishes the plane of the rotat Ing tire and calculates the toe and cam ber angles For caster the equipment locates to a pad on the steering knuckle by the lower ball joint and to the slot in the pinch bolt at the upper ball joint The computer than precisely calculates the caster angle The front end is checked for caster cross caster camber cross camber toe in out and sum toe The fasteners are loosened by the FORI equipment and alignment is done by robotic servos which maneuver the position of the lower control arm and adjust the tie rods at the same time The computer even accounts for the lash in the steering system when set ting toe to ensure a level steering wheel Then the fasteners are retorqued to specification and alignment results are rechecked Other Checks Once the vehicle s orientation has been determined for front end align ment it is possible to use the same data for precision headlamp aim The beam from the headlamps is projected into a lens which recognizes a different image for each headlamp they vary between vehicle lines because the lamps are styled different ly The operator places an electric nut runner on the headlamp adjusters and the FORI computer controls the amount direction and speed the adjusters are tumed And fina
22. tion as it was stored Instead the seat may recall to the Exit position or may not move at all Seat Recall will be tumed on in the personalization settings and Memory will be selected for Recall Position This behavior is due to the factory default settings The default setting from the factory is to have the Seat Recall set to On and the Recall Position set to Memory which is what the Driver Info Center DIC shows However the default in the Memory Seat Module for Recall Position is set to Exit The Memory Seat Module does not agree with what the DIC says If the default settings are never changed the seat will not recall to the Memory position as expected but will instead recall the Exit position Complicating the concern if an Exit setting has never stored by the cus tomer the seat will not move at all Here s how to remedy it Go into the personalization settings change the Recall Position to Exit and then exit out of the Personalization Mode Then go back into personalization settings change the Recall Position back to Memory and exit out again When you change the settings in the DIC a message is sent from the cluster indicating the new setting and the set ting is then properly learned by the Memory Seat Module This corrects the condition because the message is sent out when the setting is changed and the new setting is learned Engineering is working to get the default settings changed at the factor
23. y to correct this concem GM Technical Assistance Y Dual Zone HVAC Temperature Variation On some 2000 01 Pontiac Bonnevilles and Buick LeSabres there may be a large variation side to side in duct temperatures There are two possi ble causes and corrections Side to side HVAC temperature different from upper center outer outlets This is caused by a low refrigerant charge condition The A C system is undercharged by 0 5 Ibs To correct the condition charge to the new 2 2 Ib spec ification The passenger right blend air door does not move In this condition when you check with your Tech 2 the commanded counts are 45 and actual counts are 260 No codes set in the IPM The dual zone option is active in the DIM The door is mechanically functional and will sweep with the Tech 2 The IPM will not signal the actuator door to swing to the proper location for temperature control on the right side The Tech 2 will command the door to swing and the door will move However a Hot command results in cold air com ing from the vent The reverse is also true The system uses different actuators for the left and right sides A left side actuator 16164972 was installed at the factory on the right side To correct the condition install right side actuator 16163982 GM Technical Assistance Y Sediment in Coolant Some 2002 Trailblazer Envoy and Bravada models may have sediment in the coolant bottle and oth
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