Microphone Signal Circuit

MICROPHONE SIGNAL CIRCUIT





Description
Supply power from AV control unit to microphone. The microphone transmits the sound/voice 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 and microphone connector.
3. Check continuity between AV control unit harness connector and microphone harness connector.





4. Check continuity between AV control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair harness or connector.
2.CHECK VOLTAGE MICROPHONE VCC
1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector.





Is the inspection result normal?
YES - GO TO 3.
NO - Replace AV control unit. Service and Repair.
3.CHECK MICROPHONE SIGNAL
1. Connect microphone connector.
2. Check signal between AV control unit harness connector.





Is the inspection result normal?
YES - Replace AV control unit. Service and Repair.
NO - Replace microphone. Service and Repair.