Premium Audio (Crew Cab)

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, Crew Cab.

1. CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND MICROPHONE






1.Turn ignition switch OFF.
2.Disconnect Bluetooth control unit connector B141 and microphone connector R8.
3.Check continuity between Bluetooth control unit harness connector B141 (A) and microphone harness connector R8 (B).





4.Check continuity between Bluetooth control unit harness connector B141 (A) and ground.





Are the continuity test results as specified?
YES- GO TO 2
NO- Repair or replace harness or connector.

2. CHECK MICROPHONE POWER SUPPLY






1.Connect Bluetooth control unit connector B141 and microphone connector R8.
2.Turn ignition switch ON.
3.Check voltage between microphone harness connector R8 terminal 4 and ground.
4 - Ground: Approx. 5V
Is voltage reading approx. 5 volts?
YES- GO TO 3
NO- Replace Bluetooth control unit. Premium Audio (Crew Cab).

3. CHECK MICROPHONE SIGNAL






Check signal between Bluetooth control unit harness connector
B141 terminals 7 and 8 with CONSULT or and oscilloscope.





Are voltage readings as specified?
YES- Replace Bluetooth control unit. Premium Audio (Crew Cab).
NO- Replace microphone. Premium Audio (Crew Cab).