Subwoofer

SUBWOOFER


Description

The audio unit sends audio signals to the audio amp. The audio amp. amplifies the audio signals before sending them to the subwoofer using the audio signal circuits.




SUBWOOFER


Diagnosis Procedure

1.SPEAKER HARNESS CHECK





1. Disconnect audio amp. connector B158 and subwoofer connector B72.
2. Check continuity between audio amp. harness connector B158
(A) and subwoofer harness connector B72 (B).





3. Check continuity between audio amp. harness connector B158 (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. connector B158 and subwoofer connector
B72.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio amp. harness connector B158 terminals with CONSULT-III or oscilloscope.










Is the audio signal voltage as specified?
YES - Replace subwoofer. Refer to Subwoofer.
NO - GO TO 3
3.PRE-AMP HARNESS CHECK
1. Disconnect audio unit connector M66 and audio amp. connector
B159.
2. Check continuity between audio unit harness connector M66 (A) and audio amp. harness connector B159 (B).










3. Check continuity between audio unit harness connector M66 (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 M66 and audio amp. connector
B159.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio unit harness connector M66 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 (Crew Cab).