| Diagnosis and Testing Refer to Wiring Diagrams Section 415-01, for schematic and connector information.Refer to Wiring Diagrams Section 415-03, for schematic and connector information.Refer to Wiring Diagrams Section 415-07, for schematic and connector information. Worldwide Diagnostic System (WDS) Inspection and Verification NOTE:If the keycode is entered incorrectly 3 times, the system will lock out. The component can only be unlocked by the manufacturer. - Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart | Mechanical | Electrical | - Audio unit
- Antenna
- Foreign objects contacting speaker
- Trim poorly fitted/resonance
- Audio control switch (if equipped)
- Digital versatile disc (DVD) player
| - Fuse(s)
- Wiring harness
- Electrical connector(s)
- Speaker(s)
- Audio unit
- Audio control switch (if equipped)
- DVD player
- Antenna cable
- Central junction box (CJB)
| - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify the symptom and refer to the Self-Diagnostic Mode.
Self-Diagnostic Mode - 5000C, 6000CD, 6006CDC Audio Units NOTE:The audio unit must be in radio mode before entering the Self-Diagnostic Mode. - To enter the audio unit Self-Diagnostic Mode, switch the audio unit ON and press the preset buttons 3 and 5 together for more than 2 seconds.
- Release the preset buttons 3 and 5 and the audio unit will enter the Self-Diagnostic Mode.
Self-Diagnostic Mode | Message Displayed | Circuit Tested | | 1. 4CH RF for four channel system 2CH RF for two channel system. | Right-hand front speaker circuit. | | 2. 4CH LF for four channel system 2CH LF for two channel system. | Left-hand front speaker circuit. | | 3. 4CH RR for four channel system. | Right-hand rear speaker circuit. | | 4. 4CH LR for four channel system. | Left-hand rear speaker circuit. | - If the cause is not evident after the Self-Diagnostic Mode, connect the WDS to the data link connector (DLC).
- Retrieve the Diagnostic Trouble Code (DTC)s and refer to the DTC Index Chart.
Self-Diagnostic Mode - 1500RDS Audio Unit NOTE:The audio unit must be in radio mode before entering the Self-Diagnostic Mode. - To enter the audio unit Self-Diagnostic Mode, switch the audio unit ON. Within four seconds press the preset buttons 1 and 3 together.
- Release the preset buttons 1 and 3 and the audio unit will enter the Self-Diagnostic Mode.
Self-Diagnostic Mode | Message Displayed | Circuit Tested | | 1. 2CH RF for two channel system. | Right-hand front speaker circuit. | | 2. 2CH LF for two channel system. | Left-hand front speaker circuit. | | 3. FM frequency received. | Antenna cable. | - If the cause is not evident after the Self-Diagnostic Mode, connect the WDS to the data link connector (DLC).
- Retrieve the Diagnostic Trouble Code (DTC)s and refer to the DTC Index Chart.
Diagnostic Trouble Code (DTC) Index Chart | DTC | Description/Condition | Possible Source | Action | | B1342 | Audio unit internal failure | Audio unit | INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2401 | Tape player failure | Audio unit | INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2402 | Audio unit overheated | Audio unit | Allow the audio unit to cool and check for DTC B2402. If the concern persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2403 | CD player internal failure | Audio unit | INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2404 | Audio control switch circuit failure | Audio control switch | GO to Pinpoint Test E. | | B2405 | Audio unit overheated | Audio unit | Allow the audio unit to cool and check for DTC B2405. If the concern persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2406 | CD player internal failure | Audio unit | INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | B2408 | Speaker line short circuit | Speaker(s) | GO to Pinpoint Test D. | | B2477 | Module configuration failure | Audio unit and central junction box (CJB) | REFER to the WDS. | | P1628 | Module ignition supply input | CJB | REFER to the WDS. | | U0155 | Controller area network (CAN) communication lost | CAN | REFER to: Communications Network - Vehicles Built From: 10/2005 (418-00 Module Communications Network, Diagnosis and Testing). | | U0238 | CAN communication lost | CAN | REFER to: Communications Network - Vehicles Built From: 10/2005 (418-00 Module Communications Network, Diagnosis and Testing). | | U0187 | CAN communication lost with CDDJ | CAN | REFER to: Communications Network - Vehicles Built From: 10/2005 (418-00 Module Communications Network, Diagnosis and Testing). | | U0140 | CAN communication lost with body control module | CAN | REFER to: Communications Network - Vehicles Built From: 10/2005 (418-00 Module Communications Network, Diagnosis and Testing). | - If the cause is still evident, refer to the Symptom Chart.
Symptom Chart | Symptom | Possible Sources | Action | | The audio unit is inoperative/does not operate correctly | * Circuit. * Audio unit. | * | | The display is blank - radio and cassette player operate | * Audio unit. | * INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. | | The display is blank - radio and CD player operate | * Audio unit. | * INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. | | Poor reception | * Antenna. * Antenna cable. * Audio unit. | * | | Poor quality/distorted sound from one or more speakers (not all speakers) | * Speaker(s). * Circuit. * Audio unit. | * | | No sound from all speakers | * Audio unit. | * INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. | | No sound from one or more of the speakers (not all speakers) | * Speaker(s). * Circuit. * Audio unit. | * | | The audio control switch is inoperative/does not operate correctly. | * Circuit. * Audio control switch. * Audio unit. | * | | The digital versatile disc (DVD) player is inoperative/does not operate correctly | * Circuit(s). * DVD player. | * | | No sound from headphone(s) | * Headphone(s). * DVD player. | * Using a known good headphone, check the headphone in the right-hand and left-hand sockets. If sound is heard from each headphone socket, INSTALL a new headphone(s). If no sound is heard from the headphone socket(s), INSTALL a new DVD player. TEST the system for normal operation. | | The audio unit clock is not displayed | * Audio unit connector. * Audio unit. * Instrument cluster. | * REFER to: Instrument Cluster - Vehicles Built From: 10/2005 (413-01 Instrument Cluster, Diagnosis and Testing). | Pinpoint Tests NOTE:Use a digital multimeter for all electrical measurements. | PINPOINT TEST A : THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK THE AUDIO UNIT FOR POWER | | | 1 Disconnect Audio Unit C775. | | | 2 Ignition switch in position I. | | | 3 Measure the voltage between the audio unit C775 pin 15, circuit 29-MD15 (OG/BK), harness side and ground, and between the audio unit C775 pin 16, circuit 75-MD15 (YE/GN), harness side and ground. | | | Are the voltages greater than 10 volts? Yes No REPAIR circuit 29-MD15 (OG/BK) or circuit 75-MD15 (YE/GN). TEST the system for normal operation. | | A2: CHECK THE AUDIO UNIT GROUND CIRCUITS FOR OPEN CIRCUIT | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between the audio unit C775 pin 11, circuit 91-MD34 (BK/YE), harness side and ground, and between the audio unit C775 pin 12, circuit 91-MD15 (BK/GN), harness side and ground. | | | Are the resistances less than 1 ohm? Yes INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. No REPAIR circuit 91-MD34 (BK/YE) or circuit 91-MD15 (BK/GN). TEST the system for normal operation. | | PINPOINT TEST B : POOR RECEPTION | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE ANTENNA CABLE SHIELD | | | 1 Ignition switch in position 0. | | | 2 Disconnect the antenna cable from the audio unit. | | | 3 Measure the resistance between the antenna cable ground connector (shield), and ground. | | | Is the resistance less than 1 ohm? Yes No CLEAN and TIGHTEN the antenna base connection to the body. If the concern persists, INSTALL a new antenna cable.
REFER to: Antenna Cable (415-02 Antenna, Removal and Installation).
TEST the system for normal operation. | | B2: CHECK THE ANTENNA CENTER CONDUCTOR FOR OPEN CIRCUIT | | | 1 Remove the antenna mast. | | | 2 Measure the resistance of the center conductor between the ends of the antenna cable. | | | Is the resistance less than 1 ohm? Yes No INSTALL a new antenna cable.
REFER to: Antenna Cable (415-02 Antenna, Removal and Installation).
TEST the system for normal operation. | | B3: CHECK THE ANTENNA CABLE FOR SHORT | | | 1 Measure the resistance between the antenna center conductor and the antenna ground (shield). | | | Is the resistance greater than 10,000 ohms (open circuit)? Yes CLEAN and TIGHTEN the ground connections at the base of the antenna and battery negative cable to the body. If concern the persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. No INSTALL a new antenna cable.
REFER to: Antenna Cable (415-02 Antenna, Removal and Installation).
TEST the system for normal operation. If the concern persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
| | PINPOINT TEST C : POOR QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE SPEAKER RESISTANCE | | | 1 Disconnect Inoperative Speaker. | | | 2 Measure the resistance between the inoperative speaker pin 1 and pin 2, component side. | | | Is the resistance approximately 4.0 ohms? Yes No INSTALL a new speaker. TEST the system for normal operation. | | C2: CHECK THE SPEAKER INPUT FOR SHORT TO GROUND | | | 1 Disconnect Audio Unit C775. | | | 2 Measure the resistance between the inoperative speaker connector pin 1, harness side and ground. | | | Is the resistance greater than 10,000 ohms (open circuit)? Yes No REPAIR the inoperative speaker input circuit. TEST the system for normal operation. | | C3: CHECK THE SPEAKER RETURN FOR SHORT TO GROUND | | | 1 Measure the resistance between the inoperative speaker connector pin 2, harness side and ground. | | | Is the resistance greater than 10,000 ohms (open circuit)? Yes INSTALL a new speaker. TEST the system for normal operation. If the concern persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
No REPAIR the speaker return circuit. TEST the system for normal operation. | | PINPOINT TEST D : NO SOUND FROM ONE OR MORE OF THE SPEAKERS (NOT ALL SPEAKERS) | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: CHECK THE SPEAKER RESISTANCE | | | 1 Disconnect Inoperative Speaker. | | | 2 Measure the resistance between the inoperative speaker pin 1 and pin 2, component side. | | | Is the resistance approximately 4.0 ohms? Yes No INSTALL a new speaker(s). TEST the system for normal operation. | | D2: CHECK THE INOPERATIVE SPEAKER(S) CONNECTOR PIN 1 CIRCUIT | | | 1 Disconnect Audio Unit C776. | | | 2 Measure the resistance between the following audio unit C776 pins, harness side and the inoperative speaker(s) connector pin 1, harness side: - (Left front speaker) C527 pin 1, circuit 8-MD28 (WH) to C776 pin 3, circuit 8-MD10 (WH/BK).
- (Right front speaker) C528 pin 1, circuit 8-MD28 (WH) to C776 pin 2, circuit 8-MD17 (WH/RD).
- (Left rear speaker) C533 pin 1, circuit 8-MD29 (WH/VT) to C776 pin 4, circuit 8-MD11 (WH/VT).
- (Right rear speaker) C534 pin 1, circuit 8-MD29 (WH/VT) to C776 pin 1, circuit 8-MD18 (WH).
| | | Is the resistance less than 1 ohm? Yes No REPAIR the circuit in question. TEST the system for normal operation. | | D3: CHECK THE INOPERATIVE SPEAKER(S) CONNECTOR PIN 2 CIRCUIT | | | 1 Measure the resistance between the following audio unit C776 pins, harness side and the inoperative speaker(s) connector pin 2, harness side: - (Left front speaker) C527 pin 2, circuit 10-MD28 (GY) to C776 pin 7, circuit 10-MD10 (GY/BK).
- (Right front speaker) C528 pin 2, circuit 10-MD28 (GY) to C776 pin 6, circuit 10-MD17 (GY/RD).
- (Left rear speaker) C533 pin 2, circuit 10-MD29 (GY/WH) to C776 pin 8, circuit 10-MD11 (GY/WH).
- (Right rear speaker) C534 pin 2, 10-MD29 (GY/WH) to C776 pin 5, 10-MD18 (GY).
| | | Is the resistance less than 1 ohm? Yes No REPAIR the circuit in question. TEST the system for normal operation. | | D4: CHECK THE INOPERATIVE SPEAKER(S) CIRCUIT FOR SHORT TO GROUND | | | 1 Measure the resistance between the following inoperative speaker(s) connector pin 1, harness side and ground: - (Left front speaker) C527 pin 1, circuit 8-MD28 (WH), to ground.
- (Right front speaker) C528 pin 1, circuit 8-MD28 (WH), to ground.
- (Left rear speaker) C533 pin 1, circuit 8-MD29 (WH/VT), to ground.
- (Right rear speaker) C534 pin 1, 8-MD29 (WH/VT), to ground.
| | | Is the resistance greater than 10,000 ohms (open circuit)? Yes INSTALL a new speaker. TEST the system for normal operation. No REPAIR the circuit in question. TEST the system for normal operation. | | PINPOINT TEST E : THE AUDIO CONTROL SWITCH IS INOPERATIVE/DOES NOT OPERATE CORRECTLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: CHECK THE AUDIO UNIT OPERATES CORRECTLY USING THE AUDIO UNIT CONTROLS | | | 1 Operate the audio unit using the audio unit controls. | | | Does the audio unit operate correctly using the audio controls? Yes No INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
TEST the system for normal operation. | | E2: CHECK CIRCUIT 8-MD26 (WH/BK) FOR OPEN CIRCUIT | | | 1 Disconnect Audio Unit C777. | | | 2 Disconnect Audio Control Switch C681. | | | 3 Measure the resistance between the audio unit C777 pin 6, circuit 8-MD26 (WH/BK) harness side and the audio control switch C681 pin 1, circuit 8-MD26 (WH/BK) harness side. | | | Is the resistance less than 1 ohm? Yes No REPAIR the circuit. TEST the system for normal operation. | | E3: CHECK CIRCUIT 9-MD26 (BN/YE) FOR OPEN CIRCUIT | | | 1 Measure the resistance between the audio unit C777 pin 8, circuit 9-MD26 (BN/YE) harness side and the audio control switch C681 pin 2, circuit 9-MD26 (BN/YE) harness side. | | | Is the resistance less than 1 ohm? Yes INSTALL a new audio control switch. TEST the system for normal operation. If the concern persists, INSTALL a new audio unit.
REFER to: Audio Unit - Vehicles Built From: 10/2005 (415-01 Audio Unit, Removal and Installation).
No REPAIR the circuit. TEST the system for normal operation. | | PINPOINT TEST F : THE DIGITAL VERSATILE DISC (DVD) PLAYER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | F1: CHECK THE DVD PLAYER FOR POWER | | | 1 Disconnect DVD Player C437. | | | 2 Measure the voltage between the DVD player C437 pin 1, circuit 29-MD8 (OG), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 29-MD8 (OG). TEST the system for normal operation. If the concern persists, INSTALL a new CJB. Test the system for normal operation. | | F2: CHECK THE DVD PLAYER FOR SWITCHED POWER | | | 1 Ignition switch in position II. | | | 2 Measure the voltage between the DVD player C437 pin 2, circuit 75-MD8 (YE/BU), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 75-MD8 (YE/BU). Test the system for normal operation. | | F3: CHECK THE DVD PLAYER FOR GROUND | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between the DVD player C437 pin 3, circuit 31-MD8 (BK), harness side and ground. | | | Is the resistance less than 1 ohm? Yes Left-hand drive vehicles: INSTALL a new DVD player. Test the system for normal operation. No REPAIR circuit 31-MD8 (BK). Test the system for normal operation. | | F4: CHECK THE DVD PLAYER TO HOOD SWITCH FOR OPEN CIRCUIT | | | 1 Disconnect Hood Switch C604. | | | 2 Measure the resistance between the DVD player C437 pin 5, circuit 31S-GL7A (BK/YE) and the hood switch C604 pin 1, circuit 31S-GL7A (BK/YE), harness side. | | | Is the resistance less than 1 ohm? Yes INSTALL a new DVD player. Test the system for normal operation. No REPAIR circuit 31S-GL7A (BK/YE). Test the system for normal operation. | |
