Microphone Signal Circuit

MICROPHONE SIGNAL CIRCUIT


Description

Voice signals are transmitted from the microphone to the AV control unit using the microphone signal circuits.




MICROPHONE SIGNAL CIRCUIT


Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
1.CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE





1. Turn ignition switch OFF.
2. Disconnect AV control unit connector and microphone connector.
3. Check continuity between AV control unit harness connector
M45 (A) and microphone harness connector R109 (B).





4. Check continuity between AV control unit harness connector
M45 (A) and ground.





Are the continuity test results as specified?
YES - GO TO 2.
NO - Repair harness or connector.
2.CHECK MICROPHONE POWER SUPPLY





1. Connect AV control unit connector and microphone connector.
2. Turn ignition switch ON.
3. Check voltage between microphone harness connector R109 terminal 4 and ground.

4 - Ground : Approx. 5V

Is voltage reading approx. 5 volts?
YES - GO TO 3.
NO - Replace AV control unit. AV Control Unit.
3.CHECK MICROPHONE SIGNAL





Check signal between AV control unit harness connector M45 terminals 71 and 72.





Are voltage readings as specified?
YES - Replace AV control unit. AV Control Unit.
NO - Replace microphone. Service and Repair.