Subwoofer

SUBWOOFER





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




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Collision Avoidance and Parking Assist Systems.
1.SPEAKER HARNESS CHECK





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





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





Is the audio signal voltage as specified?
YES - Replace subwoofer. Subwoofer.
NO - GO TO 3
3.AUDIO UNIT AND AUDIO AMPLIFIER HARNESS CHECK





1. Disconnect audio unit connector M44 and audio amplifier connector B159.
2. Check continuity between audio unit harness connector M44 (A) and audio amplifier 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.AUDIO AMPLIFIER SIGNAL CHECK






1. Connect audio unit connector M44 and audio amplifier connector B159.
2. Turn ignition switch to ACC.
3. Push audio unit "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 amplifier. Service and Repair.
NO - Replace audio unit. Removal And Installation Premium Audio.