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MICROPHONE SIGNAL CIRCUIT


WITHOUT NAVIGATION : Description

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




MICROPHONE SIGNAL CIRCUIT


WITHOUT NAVIGATION : 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 terminals 7, 8, 29 and microphone harness connector terminals 1, 2, 4.

7 - 1: Continuity should exist.
8 - 2: Continuity should exist.
29 - 4: Continuity should exist.

4. Check continuity between TEL adapter unit harness connector terminals 7, 29 and ground.

7, 29 - Ground: Continuity should not exist.

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 terminal 29 and 8.

29 - 8: Approx. 5 V

Is the inspection result normal?
YES - GO TO 3.
NO - Replace TEL adapter unit.
3.CHECK MICROPHONE SIGNAL
1. Connect microphone connector.
2. Check signal between TEL adapter unit harness connector terminals 7 and 8.





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