Base Audio

MICROPHONE SIGNAL CIRCUIT

Description

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


Diagnosis Procedure

Regarding Wiring Diagram information, Sedan.

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 B126 (A) and microphone harness connector R7 (B).





4.Check continuity between Bluetooth control unit harness connector B126 (A) and ground.





Are continuity 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.





Was approx. 5V present?
YES- GO TO 3
NO- Replace Bluetooth control unit. Base Audio.

3. CHECK MICROPHONE SIGNAL






Check signal between Bluetooth control unit harness connector
B126 terminals 7 and 8.





Were voltage readings as specified?
YES- Replace Bluetooth control unit. Base Audio.
NO- Replace microphone. Base Audio.