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MICROPHONE SIGNAL CIRCUIT


Description

Supply power from TEL adapter unit to microphone. The microphone transmits the sound/voice to the microphone.




MICROPHONE SIGNAL CIRCUIT


Diagnosis Procedure

1.CHECK CONTINUITY BETWEEN TEL ADAPTER UNIT AND MICROPHONE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TEL adapter unit connector and microphone connector.
3. Check continuity between TEL adapter unit harness connector and microphone harness connector.





4. Check continuity between TEL adapter 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 TEL adapter unit connector.
2. Turn ignition switch ON.
3. Check voltage between TEL adapter unit harness connector.





Is the inspection result normal?
YES - GO TO 3.
NO - Replace TEL adapter unit.
3.CHECK MICROPHONE SIGNAL
1. Turn ignition switch OFF.
2. Connect microphone connector.
3. Turn ignition switch ON.
4. Check signal between TEL adapter unit harness connector.





Is the inspection result normal?
YES - Replace TEL adapter unit.
NO - Replace microphone.