Nissan Altima (L32) 2007-2012 Service Manual: Subwoofer (coupe)

Description

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

Diagnosis Procedure

1.HARNESS CHECK

1. Disconnect BOSE speaker amp. connector B122 and suspect rear subwoofer connector.

2. Check continuity between BOSE speaker amp. harness connector B122 (A) and suspect rear subwoofer harness connector (B).

3. Check continuity between BOSE speaker amp. harness connector B122 (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.REAR SUBWOOFER SIGNAL CHECK

1. Connect BOSE speaker amp. connector B122 and suspect rear subwoofer connector.

2. Turn ignition switch to ACC.

3. Push “POWER” switch.

4. Check the signal between BOSE speaker amp. harness connector B122 terminals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified? YES >> Replace suspect rear subwoofer. Refer to AV-222, "Removal and Installation".

NO >> GO TO 3

3.HARNESS CHECK

1. Disconnect audio unit connector M43 and BOSE speaker amp.

connector B121.

2. Check continuity between audio unit harness connector M43 (A) and BOSE speaker amp. harness connector B121 (B).

3. Check continuity between audio unit harness connector M43 (A) terminal and ground.

Are continuity test results as specified? YES >> GO TO 4

NO >> • Check connector housings for disconnected or loose terminals.

• Repair harness or connector.

4.REAR SUBWOOFER SIGNAL CHECK

1. Connect audio unit connector M43 and BOSE speaker amp.

connector B121.

2. Turn ignition switch to ACC.

3. Push “POWER” switch.

4. Check the signal between audio unit harness connector M43 terminals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified? YES >> Replace BOSE speaker amp. Refer to AV-216, "Removal and Installation - Coupe".

NO >> Replace audio unit. Refer to AV-215, "Removal and Installation".