Diagnosis Procedure

REAR DOOR TWEETER


Diagnosis Procedure

1.SPEAKER HARNESS CHECK
1. Disconnect audio amp. connectors B159 and suspect speaker connector.
2. Check continuity between audio amp. harness connectors B159
(A) and suspect speaker harness connector (B).










3. Check continuity between audio amp. harness connectors B159
(A) and ground.





Are the continuity test results as specified?
YES - GO TO 2
NO - Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
2.SPEAKER SIGNAL CHECK
1. Connect audio amp. connectors and suspect speaker connector.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio amp. harness connectors B159 terminals with CONSULT-III or oscilloscope.










Are audio signal voltage readings as specified?
YES - Replace suspect speaker. Refer to Removal and Installation - Rear Door Tweeter.
NO - GO TO 3
3.PRE-AMP HARNESS CHECK
1. Disconnect audio unit connector M44 and audio amp. connector
B159.
2. Check continuity between audio unit harness connector M44 (A) and audio amp. harness connector B159 (B).










3. Check continuity between audio unit harness connector M44 (A) and ground.





Are the continuity test results as specified?
YES - GO TO 4
NO - Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
4.PRE-AMP SIGNAL CHECK
1. Connect audio unit connector M44 and audio amp. connector B159.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio unit harness connector M44 terminals with CONSULT-III or oscilloscope.










Is the audio signal voltage reading as specified?
YES - Replace audio amp. Refer to Service and Repair.
NO - Replace audio unit. Refer to Premium Audio.