Premium Audio (Crew Cab)

POWER SUPPLY AND GROUND CIRCUIT


MICROPHONE : Diagnosis Procedure

1.CHECK POWER SUPPLY CIRCUIT (MICROPHONE SIDE)
1. Turn ignition switch ON.





2. Check voltage between microphone harness connector R8 terminal 4 and ground.





Is approximately 5V present?
YES - GO TO 3
NO - GO TO 2
2.CHECK POWER SUPPLY CIRCUIT (CONTINUITY)





1. Turn ignition switch OFF.
2. Disconnect microphone and Bluetooth control unit harness connectors.
3. Check continuity between microphone harness connector R8
(A) terminal 4 and Bluetooth control unit harness connector
B141 (B) terminal 29.





4. Check continuity between microphone harness connector R8
(A) terminal 4 and ground.





Are the continuity test results as specified?
YES - Replace the Bluetooth control unit. Refer to Premium Audio (Crew Cab).
NO - Repair harness or connector.
3.CHECK GROUND CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect microphone harness connector R8 and Bluetooth control unit harness connector B141.
3. Check continuity between microphone harness connector R8
(A) terminal 2 and Bluetooth control unit harness connector
B141 (B) terminal 8.





Does continuity exist?
YES - Inspection End.
NO - Repair harness or connector.