Nissan Maxima Service and Repair Manual: Front door speaker 

Description 

The audio unit sends audio signals to the front door speakers using the front door speaker circuits.

Diagnosis Procedure 

1.CONNECTOR CHECK

Check the audio unit and speaker connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

2.HARNESS CHECK

1. Disconnect audio unit connector M133 (A) and suspect speaker connector (B).
2. Check continuity between audio unit harness connector M133 (A) terminal and suspect speaker harness connector (B) terminal. 

 

3. Check continuity between audio unit harness connector M133 (A) terminal and ground. 

 

3.FRONT DOOR SPEAKER SIGNAL CHECK

1. Connect audio unit connector and front speaker connector.
2. Turn ignition switch to ACC.
3. Push POWER switch. 
4. Check the signal between audio unit harness connector terminals with CONSULT or oscilloscope.