TROUBLESHOOTING - Shoarmateam.nl
Contents
1. Go to No 25 If radio side faulty EEA adio faulty 4 Radio ANY SPEAKER DOSE NOT WORK Is tape player operating normally _ Radio assembly faulty ine Yes Is hiss noise produced by non functioning speaker Radio assembly faulty No Yes Recheck system after repair Does continuity exist in speaker wire harness L Speaker wire harness faulty Yes No Temporarily install another speaker Functions OK Speaker faulty Ne Yes Power amplifier faulty Recheck system after repair 2005 LEXUS IS300 RM1140U Author Date 2185 BE 182 BODY ELECTRICAL AUDIO SYSTEM eo ANY AM OR FM DOES NOR WORK 5 adio FEW PRESET TUNING BANDS Problem with radio wave signals or location __ Poor signals poor location Ne Yes Is power for the antenna being output from the radio assembly Radio assembly faulty No Yes Are both AM and FM defective No Yes Go to No 16 Is tape player operating normally __ Radio assembly faulty No Yes Temporarily install another speaker Functions OK __ Speaker faulty No Yes Hiss noise from speaker 7 Power amplifier faulty Yes No Recheck system after repair2. Hiss noise from speaker No J Power amplifier faulty Yes Recheck system after repair Radio assembly faulty Recheck system after repair 2005 LEXUS IS300 RM1140U Author Date 2193 BE 190 BODY ELECTRICAL AUDIO SYSTEM 19 CD Player SOUND JUMPS Does sound jump only during strong vibration Jumping caused by vibration No Yes Is radio assembly properly installed Install properly Yes No Functions OK if different CD inserted Wee CD faulty No Radio assembly faulty 20 CD Player SOUND QUALITY POOR VOLUME FAINT Function OK if different CD inserted ___ CD faulty No Yes Is radio operating normally Radio assembly faulty No Yes Is speaker property installed gs Install properly Yes No Temporarily install another speaker Functions OK _ Speaker faulty Yes No Radio assembly or power amplifier faulty 2005 LEXUS IS300 RM1140U Author Date 2194 BE 191 BODY ELECTRICAL AUDIO SYSTEM 21 CD Player ANY SPEAKER DOES NOT WORK Is radio operating normally Radio assembly faulty No Yes Is hiss noise produced by non functioning speaker Radio assembly faulty No Yes Recheck system
3. Radio assembly faulty Recheck system after repair 2005 LEXUS IS300 RM1140U Author Date 2186 BE 183 BODY ELECTRICAL AUDIOSYSTEM 6 Radio POOR RECEPTION Is the condition bad in comparison with other vehicles s An electric wave environment is bad Yes No Are there any additional installation parts L Does the condition get better if Sun shade film telephone antenna etc Yes removing them No Yes Influence of additional installation parts Check if there is any scratch and breaking of a wire on Repair See page BE 102 the glass antenna and the defogger pattern Yes visual check tester See page BE 167 No Is the contact of the plug jack of the radio OK _ Take a measure for contact No Yes Does the condition get better by using the outer Check the radio antenna such as pillar antenna No Yes Is the contact of the antenna terminal on the glass __ Take a measure for contact surface and the defogger terminal No Yes Is the continuity of the antenna cord OK _ Replace the antenna cord Yes No Check the grounding of the antenna antenna cord I Grounding failure choke coil and noise filter See page BE 167 NG OK Does the condition get better by replacing Replace the choke coil the choke coil
4. Yes No Does the condition get better by replacing the I Replace the antenna cord antenna cord Yes Ne Exchange the glass 2005 LEXUS IS300 RM1140U Author Date 2187 BE 184 BODY ELECTRICAL AUDIO SYSTEM 7 Radio SOUND QUALITY POOR Is sound quality always bad H gt Is sound quality bad in certain Poor signals poor location No areas only Yes Yes y No Is tape player operating normally Yes No Radio assembly or power amplifier faulty Radio assembly faulty Yes Is tape player operating normally ___ _ Radio assembly faulty No Is speaker properly installed Yes No Temporarily install another speaker Functions OK Tis Radio assembly or power amplifier faulty Recheck system after repair al L Install properly ps Speaker faulty Yes 8 Radio PRESET MEMORY DISAPPEARS Can cassette tape be inserted in tape player Ls Radio assembly faulty No Yes Check if RADIO No 1 fuse is OK Replace fuse a NG Is power supplied to B terminal of radio assembly _ B wire harness faulty No Yes Check if GND wire harness side of radio assembly grounded normally ma GND NG
5. after repair Does continuity exist in speaker wire harness Speaker wire harness faulty No Yes Temporarily install another speaker Speaker faulty Function OK Yes No Power amplifier faulty Recheck system after repair 22 CD Player CD WILL NOT BE EJECTED Is auto search button of radio Radio assembly faulty operating normally Yes No Check if RADIO No 1 fuse is OK Replace fuse OK NG Is power supplied to B terminal of radio assembly B wire harness faulty No Yes Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2195 BE 192 BODY ELECTRICAL _ AUDIO SYSTEM 23 Power Amplifier NO POWER COMING IN Is tape player operating normally Wes Radio assembly faulty es No Check if RAD No 2 fuse is OK __ Replace fuse OK NG Is power supplied to ACC terminal of power amplifier ACC wire harness faulty Yes me Check if RAD No 1 fuse is OK __ Replace fuse es NG Is power supplied to B terminal of power amplifier B wire harness faulty ka No Check if GND wire harness side of power amplifier GND faulty grounded normally NG OK Is power supplied to ACC terminal of radio assembly aS IACC wire
6. os Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2188 BODY ELECTRICAL BE 185 AUDIO SYSTEM 9 Tape Player CASSETTE TAPE CANNOT BE INSERTED Is there a foreign object inside tape player m Remove foreign object No Yes Is auto search button radio operating normally Radio assembly faulty No Yes Check if RADIO No 1 fuse is OK Replace fuse OK NG Is power supplied to B terminal of radio assembly B wire harness faulty Yes No Check if GND wire harness side of radio assembly grounded normally GND faulty ox NG Radio assembly faulty 10 Tape Player CASSETTE TAPE INSERTED BUT NO POWER Is radio operating normal I Radio assembly faulty No Yes Check if RAD No 2 fuse is OK I Replace fuse Jon NG Is power supplied to ACC terminal of radio assembly ACC wire harness faulty Yes No Check if RADIO No 1 fuse is OK Replace fuse ok NG Is power supplied to B terminal of radio assembly I B wire harness faulty ie No Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2189 BE 186 BODY ELECTRICAL AUDIO SYSTEM POWER COMING IN BUT TAPE PLAYER N
7. BE 178 BODY ELECTRICAL _ AUDIO SYSTEM TROUBLESHOOTING NOTICE When replacing the internal mechanism computer part of the audio system be careful that no part of your body or clothing comes in contact with the terminals of the leads from the IC etc of the re placement part Spare part HINT This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys tem operation and was prepared on the assumption of system component troubles except for the wires and connectors etc Always inspect the trouble taking the following items into consideration e Open or short circuit of the wire harness e Connector or terminal connection fault probe Radio Radio not operating when power switch turned to ON 1 BE1X5 03 Display indicates when power switch turned to ON but no sound including noise is produced Noise present but AM FM not operating Any speaker does not work Any AM or FM does not work _ Few preset turing bands Reception poor Sound quality poor Preset memory disappears 8 Tape Player Cassette tape cannot be inserted 10 11 12 13 14 15 16 17 Power coming in but CD player not operating 18 P Sunes o o Po Cassette tape inserted but no power es Power coming in but tape player not operating a Any speaker does not work Pe Sound quality poor ot Tape jammed malfunction with tape speed or auto reverse tC w Cassette
8. ED Is tape player operating normally No Yes Check if RAD No 2 fuse is OK OK NG Is power supplied to ACC terminal of power amplifier Yes No Check if RAD No 1 fuse is OK ox NG Is power supplied to B terminal of power amplifier ie No Check if GND wire harness side of power amplifier grounded normally es NG Is power supplied to ACC terminal of radio receiver co No Is power supplied to B terminal of radio receiver Le No Check if GND wire harness side of radio assembly grounded normally NG OK Does continuity exist in speaker wire harness ves No Temporarily install another speaker Functions OK No Yes Hiss noise from speaker Yes No Radio assembly faulty Recheck system after repair 2005 LEXUS IS300 RM1140U t Radio assembly faulty Replace fuse ACC wire harness faulty Replace fuse B wire harness faulty GND faulty ACC wire harness faulty B wire harness faulty GND faulty Speaker wire harness faulty Speaker faulty Power amplifier faulty Recheck system after repair Author Date 2184 BE 181 BODY ELECTRICAL AUDIO SYSTEM 3 Radio NOISE PRESENT BUT AM FM NOT OPERATING
9. OT OPERATING 11 Tape Player Function OK if different cassette tape inserted L Cassette tape faulty N Yes o Is radio operating normally ds Radio assembly faulty N Yes o Does continuity exist in speaker wire harness me Speaker wire harness faulty o Yes Temporarily install another speaker gt Speaker faulty Function OK Yes No Hiss noise from speaker Wo Power amplifier faulty Yes Recheck system after repair Radio assembly faulty Recheck system after repair 12 Tape Player ANY SPEAKER DOES NOT WORK Is radio operating normally ea Radio assembly faulty No Is hiss noise produced by non functioning speaker __ Radio assembly faulty N Yes Recheck system after repair O Does continuity exist in speaker wire harness is Speaker wire harness faulty Yes No Temporarily install another speaker gt Speaker faulty Function OK Yes No Radio assembly or power amplifier faulty 2005 LEXUS IS300 RM1140U Author Date 2190 BODY ELECTRICAL BE 187 AUDIO SYSTEM 13 Tape Player SOUND QUALITY POOR VOLUME FAINT Function OK if different cassette tape inserted I Cassette tape faulty No Yes Operates normally after cleaning the heads Head dirty No Yes Is radio opera
10. been already inserted H Eject CD Iv R Yes Is auto search button of radio operating normally Yes Radio assembly faulty es No Check if RADIO No 1 fuse is OK Replace fuse OK NG Is power supplied to B terminal of radio assembly ig B wire harness faulty Yi No es Check if GND wire harness side of radio assembly GND faulty grounded normally NG OK Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2192 BE 189 BODY ELECTRICAL AUDIO SYSTEM 17 CD Player CD INSERTED BUT NO POWER Yes Radio assembly faulty Is radio operating normally No Check if RADIO No 2 fuse is OK I Replace fuse OK NG Is power supplied to ACC terminal of radio assembly Ls ACC wire harness faulty Yes No Radio assembly faulty 18 CD Player POWER COMING IN BUT CD PLAYER NOT OPERATING Is CD inserted with correct side up Insert correctly Yes No Function OK if different CD inserted m CD faulty No Yes Is radio operating normally I Radio assembly Yes No Dose continuity exist in speaker wire harness __ Speaker wire harness faulty Yes No Temporarily install another speaker Functions OK __ Speaker faulty Yes No
11. harness faulty No es Is power supplied to B terminal of radio assembly L B wire harness faulty pe No Check if GND wire harness side of radio assembly L GND faulty grounded normally NG ox Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2196 BODY ELECTRICAL AUDIO SYSTEM BE 193 24 Power Amplifier OPERATING POWER COMING IN BUT WOOFER POWER AMPLIFIER NOT Is tape player operating normally Radio assembly faulty No Yes Check if RAD No 2 fuse is OK Replace fuse OK NG Is power supplied to ACC terminal of power amplifier ACC wire harness faulty Yes No Check if RAD No 1 fuse is OK Replace fuse ox NG Is power supplied to B terminal of power amplifier B wire harness faulty Rg No Check if GND wire harness side of power amplifier grounded normally GND faulty NG i Is power supplied to ACC terminal of radio assembly ACC wire harness faulty kg No Is power supplied to B terminal of radio assembly B wire harness faulty Yes No Check if GND wire harness side of radio assembly grounded normally GND faulty NG OR Is there continuity in speaker wire harness Speaker wire harness faulty ves No Temporarily instal
12. l another speaker Functions OK Speaker faulty No Yes Hiss noise from speaker Yes No Power amplifier faulty Recheck system after repair Radio assembly faulty Recheck system after repair 2005 LEXUS IS300 RM1140U Author Date 2197 BE 194 BODY ELECTRICAL AUDIO SYSTEM 25 Power Amplifier ANY SPEAKER DOES NOT WORK Is radio operating normally Radio assembly faulty No Yes Is hiss noise produced by non functioning speaker Ne Yes Radio assembly faulty Recheck system after repair Does continuity exist in speaker wire harness Speaker wire harness faulty Yes No Temporarily install another speaker Function OK Speaker faulty Yes Ne Power amplifier faulty Recheck system after repair 2005 LEXUS IS300 RM1140U Author Date 2198 BODY ELECTRICAL BE 195 AUDIO SYSTEM 26 Noise NOISE OCCURS Does the noise occur only in the radio It occurs in th Yes No l e cassette and CD Refer to No 27 Does the noise occur in a particular place An electric environment No Yes Is there any additional installation part around the glass imprinted antenna Sun shade film telephone antenna etc Does the noise stop by removing it Ye
13. pe of noise 2005 LEXUS IS300 RM1140U Author Date 2200
14. s No Influence of the film or the noise radiation of the additional installation part Does the noise occur even pulling out the antenna cord from the radio Check the radio Yes No Does the noise occur even after pulling out the antenna terminal on the glass surface and pole antenna Noise mixing into the antenna cable Yes No Isn t there any adhesive Butyl rubber stuck on the bases of the antenna terminal Yes Failure of glass installation Must plane the butyl rubber ae Does the noise occur even after pulling out the defogger terminal Yes Interfering noise from the defogger line and choke coil No Check the grounding of the antenna antenna cord Grounding failure NG ox Does the condition get better by replacing the Pole antenna Replace the Pole antenna Yes No Does the condition get better by replacing the antenna cord Replace the antenna cord Yes No Noise radiates directly to the antenna from the generation source 2005 LEXUS IS300 RM1140U Author Date 2199 BE 196 BODY ELECTRICAL AUDIO SYSTEM 27 Noise NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING Is speaker properly installed Install properly Yes No With vehicles
15. stationary lightly tap each system Is noise produced Yes Each system faulty No Noise is produced from static electricity accumulating in the vehicle body 28 Noise NOISE PRODUCED WHEN ENGINE STARTS Whistling noise which becomes high pitched when accelerator strongly depressed disappears shortly after engine stops Generator noise Yes No Whining noise occurs when A C is operating 4 A C noise No Yes Scratching noise occurs during sudden acceleration driving on rough roads or when ignition switch is turned ON _ Fuel gauge noise Yes No Clicking sound is heard when horn button is pressed then released Whirring grating sound is heard when pushed continuously ws _ Horn noise Yes ne Murmuring sound stops when engine stops gt Ignition noise No Yes Tick tack noise occurs in co ordination with blinking of flasher m Turn signal noise Yes No Noise occurs during window washer operation I Washer noise No Yes Scratching noise occurs while engine is running and continues a while even after engine stops I Engine coolant temp gauge noise Yes ie Scraping noise in line with wiper beat m Wiper noise No Yes Other ty
16. tape will not eject CD cannot be inserted CD inserted but no power Sound quality poor Volume faint 2 21 2 2 24 2 2 2 2 Any speaker does not work CD will not be ejected Power Amplifier No power coming in Power coming in but power amplifier not operating Po Any speaker does not work Noise Noise occurs eh Noise produced by vibration or shock while driving Noise produced when engine starts The term AM includes LW MW and SW and the term FW includes UKW 2005 LEXUS IS300 RM1140U Author Date 2182 BE 179 BODY ELECTRICAL AUDIO SYSTEM 1 Radio RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO ON Is tape player operating normally Ka Radio assembly faulty es No Check if RAD No 2 fuse is OK __ Replace fuse OK NG Is power supplied to ACC terminal of radio assembly ACC wire harness faulty Yes No Check if RAD No 1 fuse is OK _ Replace fuse NG Jor Is power supplied to B terminal of radio assembly e B wire harness faulty Yes No Check if GND wire harness side to radio assembly is OK GND faulty NG es Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2183 BE 180 BODY ELECTRICAL AUDIO SYSTEM 2 Radio DISPLAY INDICATES WHEN POWER SWITCH TURNED TO ON BUT NO SOUND INCLUDING NOISE IS PRODUC
17. ting normally __ Radio assembly faulty Ne Yes Is speaker properly installed Install properly r Yes No Temporarily install another speaker Function OK i Speaker faulty Yes No Radio assembly faulty 14 Tape Player TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO REVERSE Function OK if different tape less than 120 mins is inserted L Cassette tape faulty No Yes Is there a foreign object inside tape player Remove foreign object No Yes Operates normally after cleaning the heads __ Head dirty No Yes Radio assembly faulty 2005 LEXUS IS300 RM1140U Author Date 2191 BE 188 BODY ELECTRICAL AUDIO SYSTEM 15 Tape Player CASSETTE TAPE WILL NOT BE EJECTED Is tape player operating normally Ls Cassette tape jammed Yes No Is auto search button of radio operating normally g Radio assembly faulty N Yes o Check if RADIO No 1 fuse is OK Replace fuse NG OK Is power supplied to B terminal of radio assembly B wire harness faulty No Yes Radio assembly faulty 16 CD Player CD CANNOT BE INSERTED Six discs have
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