Nissan Maxima Service and Repair Manual: Subwoofer

Description

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

Diagnosis Procedure

1.CONNECTOR CHECK

Check the audio unit, subwoofer amp. and subwoofer connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

2.HARNESS CHECK

1. Disconnect subwoofer amp. connector B21 and suspect subwoofer connector.
2. Check continuity between subwoofer amp. harness connector B21 (A) and suspect subwoofer harness connector (B).
3. Check continuity between subwoofer harness connector B21 (A) and ground.

3.REAR SUBWOOFER SIGNAL CHECK

1. Connect subwoofer amp. connector B21 and suspect subwoofer connector.
2. Turn ignition switch to ACC.
3. Push POWER switch.
4. Check the signal between subwoofer amp. harness connector B21 terminals with CONSULT or oscilloscope.

4.HARNESS CHECK

1. Disconnect audio unit connector M133 and subwoofer speaker amp. connector B21.
2. Check continuity between audio unit harness connector M133 (A) and subwoofer amp. harness connector B21 (B).
3. Check continuity between audio unit harness connector M133 (A) terminal and ground.

5.SUBWOOFER SIGNAL CHECK

1. Connect audio unit connector M133 and subwoofer amp. connector B21.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio unit harness connector M133 terminals with CONSULT or oscilloscope.