Microphone Signal Circuit

MICROPHONE SIGNAL CIRCUIT

Description

Power is supplied from the AV control unit to the microphone. The microphone transmits the sound voice to the AV control unit.


Diagnosis Procedure


1. CHECK HARNESS CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE

1.Turn the ignition switch OFF.
2.Disconnect the AV control unit and microphone connectors.
3.Check for continuity between the AV control unit harness connector and microphone harness connector.





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





Is the check result normal?
YES- GO TO 2.
NO- Repair the harnesses or connectors.

2. CHECK MICROPHONE POWER SUPPLY VOLTAGE

1.Connect the AV control unit connector.
2.Turn power switch ON.
3.Check voltage between AV control unit harness connectors.





Is the check result normal?
YES- GO TO 3.
NO- Replace the AV control unit. Refer to "Removal and Installation" Base Audio And Navigation.

3. CHECK MICROPHONE SIGNAL

1.Turn the ignition switch OFF.
2.Connect the microphone connector.
3.Turn power switch ON.
4.Check signals between the AV control unit harness connector terminals.





Is the check result normal?
YES- Replace the AV control unit. Refer to "Removal and Installation" Base Audio And Navigation.
NO- Replace the microphone. Refer to "Removal and Installation" Base Audio and Navigation.