Bose W/ Monochrome Display

MICROPHONE SIGNAL CIRCUIT


Description

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




MICROPHONE SIGNAL CIRCUIT


Diagnosis Procedure

Regarding Wiring Diagram information, Bose W/ Monochrome Display.
1.CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND MICROPHONE





1. Turn ignition switch OFF.
2. Disconnect Bluetooth control unit connector and microphone connector.
3. Check continuity between Bluetooth control unit harness connector B131 (A) and microphone harness connector R7 (B).






4. Check continuity between Bluetooth control unit harness connector B131 (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 Bluetooth control unit connector and microphone connector.
2. Turn ignition switch ON.
3. Check voltage between microphone harness connector R7 terminal 4 and ground.





Is voltage reading approx. 5 volts?
YES - GO TO 3.
NO - Replace Bluetooth control unit. Bose W/ Monochrome Display.
3.CHECK MICROPHONE SIGNAL





Check signal between Bluetooth control unit harness connector
B131 terminals 7 and 8.





Are voltage readings as specified?
YES - Replace Bluetooth control unit. Bose W/ Monochrome Display.
NO - Replace microphone. Bose W/ Monochrome Display.