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.
MICROPHONE SIGNAL CIRCUIT
Diagnosis Procedure
1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT
- Turn ignition switch OFF.
- Disconnect AV control unit connector M46 and microphone connector R7.
- Check continuity between AV control unit harness connector M46 (A) terminals 45, 46, 47 and microphone harness connector R7 (B) terminals 1, 2, 4.
- Check continuity between AV control unit harness connector M46 (A) terminals 45, 46, 47 and ground.
45, 46, 47 - Ground : Continuity should not exist.
Is Inspection result OK?
YES >> GO TO 2
NO >> Repair harness or connector.
2.CHECK MICROPHONE VCC VOLTAGE
- Connect AV control unit connector.
- Turn ignition switch ON.
- Check voltage between AV control unit harness connector M46 terminals 46 and 47.
46 - 47 : Approx. 5V
Is Inspection result OK?
YES >> GO TO 3
NO >> Replace AV control unit. Refer to See: Radio/Stereo\Service and Repair\Audio Unit\Bose Audio With Navigation.
3.CHECK MICROPHONE SIGNAL
- Connect microphone connector.
- Check signal between AV control unit harness connector M46 terminals 45 and 47.
Is Inspection result OK?
YES >> Replace AV control unit. Refer to See: Radio/Stereo\Service and Repair\Audio Unit\Bose Audio With Navigation.
NO >> Replace microphone. Refer to See: Cellular Phone Microphone\Service and Repair\Bose Audio With Navigation.
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