Nissan Altima 2007-2012 Service Manual: Microphone signal circuit

Description

Power is supplied to the microphone from the AV control unit. The microphone transmits voice signals to the AV control unit.

Diagnosis Procedure

1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M46 and microphone connector R7.

3. Check continuity between AV control unit harness connector M46 (A) terminals 45, 46, 47 and microphone harness connector R7 (B) terminals 1, 2, 4.

4. Check continuity between AV control unit harness connector M46 (A) terminals 45, 46, 47 and ground.

Is inspection result OK? YES >> GO TO 2

NO >> Repair harness or connector.

2.CHECK MICROPHONE VCC VOLTAGE

1. Connect AV control unit connector.

2. Turn ignition switch ON.

3. Check voltage between AV control unit harness connector M46 terminals 46 and 47.

Is inspection result OK? YES >> GO TO 3

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

3.CHECK MICROPHONE SIGNAL

1. Connect microphone connector.

2. Check signal between AV control unit harness connector M46 terminals 45 and 47.

Is inspection result OK? YES >> Replace AV control unit. Refer to AV-437, "Removal and Installation".

NO >> Replace microphone. Refer to AV-456, "Removal and Installation".

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