PROBLEM SYMPTOMS TABLE
HINT
- Before inspecting the suspected areas listed in the table below, check the fuse and relay.
- Before inspecting the suspected areas listed in the table below, check the DTCs.
- Methods used to verify the cause of the problem are listed in order of probability in the suspected area column.
Audio Function
| Symptom | Suspected area | Proceed to |
|---|---|---|
| Pressing power switch does not turn on system. | 1. Pressing power switch does not turn on system | PRESSING POWER SWITCH DOES NOT TURN ON SYSTEM |
| 2. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT | |
| 3. AVC-LAN Circuit | AVC-LAN CIRCUIT | |
| 4. Replace radio receiver | REPLACE RADIO RECEIVER | |
| Panel switch does not function. | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. AVC-LAN Circuit | AVC-LAN CIRCUIT | |
| 3. Replace radio receiver | REPLACE RADIO RECEIVER | |
| No sound can be heard from speakers (audio is mute). | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. No sound can be heard from speakers (audio is mute) | NO SOUND CAN BE HEARD FROM SPEAKERS (AUDIO IS MUTE) | |
| 3. Stereo component amplifier power source circuit | STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT | |
| 4. Sound signal circuit between radio receiver and stereo component amplifier | SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 5. Speaker circuit | SPEAKER CIRCUIT | |
| 6. Mute signal circuit between radio receiver and stereo component amplifier | MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 7. Mute signal circuit between navigation ecu and stereo component amplifier | MUTE SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND STEREO COMPONENT AMPLIFIER | |
| 8. Replace stereo component amplifier | STEREO COMPONENT AMPLIFIER | |
| 9. Replace radio receiver | REPLACE RADIO RECEIVER | |
| Sound cannot be heard only from front speaker (driver side). (Volume is too low.) (Only with navigation system) | 1. Driver side speaker circuit | DRIVER SIDE SPEAKER CIRCUIT |
| 2. Sound signal circuit between radio receiver and stereo component amplifier | SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 3. Replace stereo component amplifier | STEREO COMPONENT AMPLIFIER | |
| 4. Replace radio receiver | REPLACE RADIO RECEIVER | |
| Sound quality is bad in all modes. (Volume is too low.) | 1. Poor sound quality in all modes (low volume) | POOR SOUND QUALITY IN ALL MODES (LOW VOLUME) |
| 2. Speaker circuit | SPEAKER CIRCUIT | |
| 3. Sound signal circuit between radio receiver and stereo component amplifier | SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 4. Mute signal circuit between radio receiver and stereo component amplifier | MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER | |
| 5. Mute signal circuit between navigation ecu and stereo component amplifier | MUTE SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND STEREO COMPONENT AMPLIFIER | |
| 6. Replace stereo component amplifier | STEREO COMPONENT AMPLIFIER | |
| 7. Replace radio receiver | REPLACE RADIO RECEIVER | |
| ASL does not function. | 1. Vehicle speed signal circuit between stereo component amplifier and combination meter | VEHICLE SPEED SIGNAL CIRCUIT BETWEEN STEREO COMPONENT AMPLIFIER AND COMBINATION METER |
| Sound cannot be heard or sound quality is bad. (RSE sound) | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. Multi-display controller power source circuit | MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT | |
| 3. Sound signal circuit between radio receiver and multi-display controller | SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND MULTI-DISPLAY CONTROLLER | |
| 4. Replace radio receiver | REPLACE RADIO RECEIVER | |
| 5. Replace multi-display controller | TELEVISION DISPLAY | |
| Abnormal noise occurs. | 1. Noise occurs | NOISE OCCURS |
| 2. Replace stereo component amplifier | STEREO COMPONENT AMPLIFIER | |
| Replace radio receiver | REPLACE RADIO RECEIVER | |
| Radio broadcast cannot be received (poor reception). | 1. Radio broadcast cannot be received (poor reception) | RADIO BROADCAST CANNOT BE RECEIVED (POOR RECEPTION) |
| CD cannot be inserted/played or CD is ejected right after insertion. | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. CD Cannot be inserted/played or cd is ejected right after insertion | CD CANNOT BE INSERTED/PLAYED OR CD IS EJECTED RIGHT AFTER INSERTION | |
| CD cannot be ejected. | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. CD Cannot be ejected | CD CANNOT BE EJECTED | |
| Sound quality is bad only when playing CD. (Volume is too low.) | 1. Sound quality is bad only when cd is played (volume is too low) | SOUND QUALITY IS BAD ONLY WHEN CD IS PLAYED (VOLUME IS TOO LOW) |
| CD sound skips. | 1. CD sound skips | CD SOUND SKIPS |
| Cassette tape cannot be inserted or played. | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. Cassette tape cannot be inserted or played | CASSETTE TAPE CANNOT BE INSERTED OR PLAYED | |
| Cassette tape cannot be ejected. | 1. Radio receiver power source circuit | RADIO RECEIVER POWER SOURCE CIRCUIT |
| 2. Cassette tape cannot be ejected | CASSETTE TAPE CANNOT BE EJECTED | |
| Sound quality is bad only when playing tape. | 1. Sound quality is bad only when playing tape | SOUND QUALITY IS BAD ONLY WHEN PLAYING TAPE |
| Tape is tangled due to incorrect tape speed or auto-reverse malfunction. | 1. Tape is tangled due to incorrect tape speed or auto-reverse malfunction | TAPE IS TANGLED DUE TO INCORRECT TAPE SPEED OR AUTO-REVERSE MALFUNCTION |
| Radio receiver cannot be dimmed in night time. | 1. Dimmer signal circuit | DIMMER SIGNAL CIRCUIT |
| 2. Replace radio receiver | REPLACE RADIO RECEIVER | |
| Radio receiver cannot be illuminated in night time. | 1. Illumination circuit | ILLUMINATION CIRCUIT |
| 2. Replace radio receiver | REPLACE RADIO RECEIVER |
AUDIO FUNCTION PROBLEM SYMPTOMS REFERENCE
Steering Pad Switch Function
| Symptom | Suspected area | Proceed to |
|---|---|---|
| Audio system cannot be operated with steering pad switch. | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Replace radio receiver | REPLACE RADIO RECEIVER |
STEERING PAD SWITCH FUNCTION PROBLEM SYMPTOMS REFERENCE
Scheme 148
Scheme 149
Scheme 150
- RADIO RECEIVER RADIO RECEIVER CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification B (R2-1) - GND (R2-20) L-B - BR Battery Always 10 to 14 V ILL+ (R2-2) - GND (R2-20) G - BR Illumination (rheostat) signal Light contro1 switch OFF --> TAIL Below 1 V --> 10 to 14 V ATX+ (R2-5) - GND (R2-20) P - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V MUTE (R2-7) - GND (R2-20) GR - BR MUTE signal Audio system is playing --> Changing Above 3.5 V --> Below 1 V R+ (R2-8) - GND (R2-20) B - BR Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output L+ (R2-9) - GND (R2-20) R - BR Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output SLD (R2-10) - Body ground Shielded - Body ground Shield ground Always Below 1 V ACC (R2-11) - GND (R2-20) GR - BR Accessory (ON) Turn ignition switch to ACC 10 to 14 V ILL- (R2-12) - GND (R2-20) W - BR Illumination (rheostat) signal Turn ignition switch off --> ON Below 1 V --> Pulse generation ANT (R2-13) - GND (R2-20) O - BR Power source of antenna Radio switch ON and AM or FM 10 to 14 V ATX- (R2-15) - GND (R2-20) L - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V R - (R2-18) - GND (R2-20) W - BR Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output L - (R2-19) - GND (R2-20) G - BR Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output GND (R2-20) - Body ground BR - Body ground Ground Always Below 1 V SWG (R4-6) - GND (R2-20) R - BR Steering pad switch ground Always Below 1 V SW1 (R4-7) - GND (R2-20) G - BR Steering pad switch signal Steering pad switch not operated 4 V or more --> SEEK+ switch pushed --> Approx. 0.5 V --> SEEK- switch pushed --> Approx. 0.9 V VOL+ switch pushed --> Approx. 2.0 V VOL- switch pushed --> Approx. 3.4 V SW2 (R4-8) - GND (R2-20) V - BR Steering pad switch signal Steering pad switch not operated --> MODE switch pushed 4 V or more --> Below 2.5 V TX+ (R4-9) - GND (R2-20) ( (2) ) Y - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V TX- (R4-10) - GND (R2-20) ( (2) ) BR - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V RSLD (R4-14) - Body ground Shielded - Body ground Shield ground Always Below 1 V R-R+ (R4-15) - GND (R2-20) ( (2) ) P - BR Sound signal to RSE Audio system is playing A waveform synchronized with sounds is output R-R- (R4-16) - GND (R2-20) ( (2) ) LG - BR Sound signal to RSE Audio system is playing A waveform synchronized with sounds is output R-L+ (R4-17) - GND (R2-20) ( (2) ) SB - BR Sound signal to RSE Audio system is playing A waveform synchronized with sounds is output R-L- (R4-18) - GND (R2-20) ( (2) ) BR - BR Sound signal to RSE Audio system is playing A waveform synchronized with sounds is output RMUT (R4-19) - GND (R2-20) ( (2) ) O - BR RSE MUTE signal Audio system is playing --> Changing Above 3.5 V --> Below 1 V ADIM (R4-20) - GND (R2-20) SB - BR Illumination (auto dimmer) signal Ignition switch on, headlight dimmer switch in TAIL or ON and automatic light control sensor covered by hand Above 9 V CSLD (R3-1) - Body ground Shielded - Body ground Shield ground Always Below 1 V CDR+ (R3-2) - GND (R2-20) ( (2) ) L - BR Sound signal to RSE RSE system is playing A waveform synchronized with sounds is output CDR- (R3-3) - GND (R2-20) ( (2) ) O - BR Sound signal to RSE RSE system is playing A waveform synchronized with sounds is output CDL+ (R3-4) - GND (R2-20) ( (2) ) Y - BR Sound signal to RSE RSE system is playing A waveform synchronized with sounds is output CDL- (R3-5) - GND (R2-20) ( (2) ) V - BR Sound signal to RSE RSE system is playing A waveform synchronized with sounds is output MUTE (R3-6) - GND (R2-20) ( (2) ) B - BR RSE MUTE signal RSE system is changing Above 3.5 V --> Below 1 V TX+ (R3-9) - GND (R2-20) ( (1) ) Y - BR AVC - LAN communication signal Turn ignition switch to ACC 2 to 3 V TX- (R3-10) - GND (R2-20) ( (1) ) BR - BR AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V (1) With Navigation System (2) With Rear Seat Entertainment System
- STEREO COMPONENT AMPLIFIER (STANDARD SYSTEM) STEREO COMPONENT AMPLIFIER TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification +B (S30-1) - GND (S30-16) W - W-B Battery Always 10 to 14 V WF2+ (S30-4) - GND (S30-16) V - W-B Sound signal (Woofer Left) Audio system is playing A waveform synchronized with sounds is output WF1+ (S30-5) - GND (S30-16) P - W-B Sound signal (Woofer Right) Audio system is playing A waveform synchronized with sounds is output RL+ (S30-6) - GND (S30-16) R - W-B Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output RR+ (S30-7) - GND (S30-16) R-Y - W-B Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output FL+ (S30-8) - GND (S30-16) Y ( (1) 1) - W-B BR ( (2) 2) - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output FR+ (S30-9) - GND (S30-16) V - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output +B2 (S30-10) - GND (S30-16) W - W-B Battery Always 10 to 14 V WF2- (S30-13) - GND (S30-16) W - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output WF1- (S30-14) - GND (S30-16) L-B - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output GND2 (S30-15) - Body ground W-B - Body ground Ground Always Below 1 V GND (S30-16) - Body ground W-B - Body ground Ground Always Below 1 V RL- (S30-17) - GND (S30-16) GR - W-B Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output RR- (S30-18) - GND (S30-16) L - W-B Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output FL- (S30-19) - GND (S30-16) LG ( (1) 1) - W-B R-Y ( (2) 2) - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output FR- (S30-20) - GND (S30-16) P - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output MUTE (S29-1) - GND (S30-16) GR - W-B Mute signal from radio receiver Audio system is playing --> Changing Above 3.5 V --> Below 3.5 V L-(S29-2) - GND (S30-16) G - W-B Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output L+ (S29-3) - GND (S30-16) R - W-B Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output R- (S29-4) - GND (S30-16) W - W-B Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output R+ (S29-5) - GND (S30-16) B - W-B Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output TX- (S29-7) - GND (S30-16) L - W-B AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V TX+ (S29-8) - GND (S30-16) P - W-B AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V SPD (S29-11) - GND (S30-16) SB - W-B Speed signal from combination meter Vehicle is driven Pulse generation ACC (S29-12) - GND (S30-16) P - W-B Accessory (ON) Turn ignition switch to ACC Below 1 V --> 10 to 14 V N-MU (S29-21) - GND (S30-16) ( (1) 1) V - W-B Mute signal from navigation ECU Navigation system is changing Above 3.5 V --> Below 1 V (1) With Navigation System (2) Without Navigation System
- STEREO COMPONENT AMPLIFIER (MARK LEVINSON SYSTEM) STEREO COMPONENT AMPLIFIER CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification FR+ (S28-1) - GND (S28-13) P - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output FL+ (S28-2) - GND (S28-13) V - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output RR+ (S28-3) - GND (S28-13) R-Y - W-B Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output RL+ (S28-4) - GND (S28-13) R - W-B Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output CTF+ (S28-5) - GND (S28-13) GR - W-B Sound signal (Center) Audio system is playing A waveform synchronized with sounds is output B+ (S28-7) - GND (S28-13) W - W-B Battery Always 10 to 14 V FR- (S28-8) - GND (S28-13) L-B - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output FL- (S28-9) - GND (S28-13) W - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output RR- (S28-10) - GND (S28-13) L - W-B Sound signal (Rear Right) Audio system is playing A waveform synchronized with sounds is output RL- (S28-11) - GND (S28-13) GR - W-B Sound signal (Rear Left) Audio system is playing A waveform synchronized with sounds is output E (S28-12) - Body ground W-B - Body ground Ground Always Below 1 V GND (S28-13) - Body ground W-B - Body ground Ground Always Below 1 V CTF- (S28-14) - GND (S28-13) B - W-B Sound signal (Center) Audio system is playing A waveform synchronized with sounds is output B+ (S28-16) - GND (S28-13) W - W-B Battery Always 10 to 14 V TFR+ (S27-1) - GND (S28-13) V - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output TFL+ (S27-2) - GND (S28-13) Y ( (1) ) - W-B BR ( (2) ) - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output MTX+ (S27-5) - GND (S28-13) P - W-B AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V N-MU (S27-9) - GND (S28-13) V ( (1) ) - W-B Mute signal from navigation ECU Audio system is playing --> Changing Above 3.5 V --> Below 1 V R+ (S27-11) - GND (S28-13) B - W-B Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output L+ (S27-12) - GND (S28-13) R - W-B Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output SPD (S27-13) - GND (S28-13) SB - W-B Speed signal from combination meter Vehicle is driven Pulse generation TFR- (S27-14) - GND (S28-13) P - W-B Sound signal (Front Right) Audio system is playing A waveform synchronized with sounds is output TFL- (S27-15) - GND (S28-13) LG ( (1) ) - W-B R-Y ( (2) ) - W-B Sound signal (Front Left) Audio system is playing A waveform synchronized with sounds is output MTX- (S27-18) - GND (S28-13) L - W-B AVC-LAN communication signal Turn ignition switch to ACC 2 to 3 V ACC (S27-20) - GND (S28-13) P - W-B Accessory (ON) Turn ignition switch off --> ACC or ON 10 to 14 V MUTE (S27-21) - GND (S28-13) GR - W-B Mute signal from radio receiver Audio system is playing --> Changing Above 3.5 V --> Below 1 V R- (S27-23) - GND (S28-13) W - W-B Sound signal from radio receiver (Right) Audio system is playing A waveform synchronized with sounds is output L- (S27-24) - GND (S28-13) G - W-B Sound signal from radio receiver (Left) Audio system is playing A waveform synchronized with sounds is output (1) With Navigation System (2) Without Navigation System
- GATEWAY ECU (See «TERMINALS OF ECU»(ref-236036-S10501378812006062900000) )
- MULTI-DISPLAY CONTROLLER (See «TERMINALS OF ECU»(ref-236035-S17368704062006062900000) )