Nissan Altima 2007-2012 Service Manual: Center speaker

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 center speaker using the audio signal circuits.

Diagnosis Procedure

1.HARNESS CHECK

1. Disconnect BOSE speaker amp. connector B121 and center speaker connector M151.

2. Check continuity between BOSE speaker amp. harness connector B121 (A) and center speaker harness connector M151 (B).

3. Check continuity between BOSE speaker amp. harness connector B121 (A) and ground.

Are continuity test results as specified? YES >> GO TO 2

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

• Repair harness or connector.

2.CENTER SPEAKER SIGNAL CHECK

1. Connect BOSE speaker amp. connector B121 and center speaker connector M151.

2. Turn ignition switch to ACC.

3. Push “POWER” switch.

4. Check the signal between BOSE speaker amp. harness connector B121 terminals with CONSULT-III or oscilloscope.

Is the audio signal voltage as specified? YES >> Replace center speaker. Refer to AV-441, "Removal and Installation".

NO >> GO TO 3

3.HARNESS CHECK

1. Disconnect AV control unit connector M47 and BOSE speaker amp. connector B121.

2. Check continuity between audio unit harness connector M47 (A) and BOSE speaker amp. harness connector B121 (B).

3. Check continuity between AV control unit harness connector M47 (A) 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.CENTER SPEAKER SIGNAL CHECK

1. Connect AV control unit connector and BOSE speaker amp.

connector.

2. Turn ignition switch to ACC.

3. Push “POWER” switch.

4. Check the signal between audio unit harness connector M47 terminals with CONSULT-III or oscilloscope.

Is the audio signal voltage reading as specified? YES >> Replace BOSE speaker amp. For coupe, refer to AV- 438, "Removal and Installation - Coupe". For sedan, refer to AV-438, "Removal and Installation - Sedan".

NO >> Replace AV control unit. Refer to AV-437, "Removal and Installation".

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