POWER SUPPLY AND GROUND CIRCUIT (COUPE)
MICROPHONE : Diagnosis Procedure
1.CHECK POWER SUPPLY CIRCUIT (MICROPHONE SIDE)
Check voltage between microphone harness connector and ground.
Is proper voltage present?
YES >> GO TO 4
NO >> GO TO 2
2.CHECK POWER SUPPLY CIRCUIT (CONTINUITY)
- Turn ignition switch OFF.
- Disconnect microphone and AV control unit harness connectors.
- Check continuity between microphone harness connector R7 (A) terminal 4 and AV control unit harness connector M46 (B) terminal 46.
- Check continuity between microphone harness connector R7 (A) terminal 4 and ground.
Are the continuity test results as specified?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK POWER SUPPLY CIRCUIT (AV CONTROL UNIT SIDE)
- Connect AV control unit harness connector.
- Turn ignition switch to ACC.
- Check voltage between AV control unit harness connector and ground.
Is voltage approximately 5 volts?
YES >> Inspection End.
NO >> Replace AV control unit. Refer to See: Radio/Stereo\Service and Repair\Audio Unit\Bose Audio With Navigation.
4.CHECK GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect microphone harness connector R7 and AV control unit harness connector M46.
- Check continuity between microphone harness connector R7 (A) terminal 2 and AV control unit harness connector M46 (B) terminal 47.
Does continuity exist?
YES >> Inspection End.
NO >> Repair harness or connector.
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