Steering Switch Circuit Check

Steering Switch Circuit Check

Description

When one of the steering wheel audio control switch buttons are pushed, the resistance in the steering wheel audio control switch circuit changes depending on which button is pushed.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Premium Audio System: Wiring Diagram [Crew Cab] Premium Audio System [Crew Cab] ].


1. CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE

1 Turn ignition switch OFF.
2 Disconnect steering wheel audio control switch connector M102.





3 Check resistance between steering switch connector terminals.






Do the steering wheel audio control switch buttons check OK?
YES
GO TO 2
NO
Replace steering wheel audio control switch. Refer to [Steering Switch: Removal and Installation] Premium Audio (Crew Cab).

2. CHECK HARNESS

1 Disconnect Bluetooth control unit harness connector B141 and spiral cable harness connector M30.





2 Check continuity between Bluetooth control unit harness connector B141 (A) and spiral cable harness connector M30 (B).






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






Are the continuity results as specified?
YES
GO TO 3
NO
Repair or replace harness or connector.

3. SPIRAL CABLE CHECK

1 Disconnect spiral cable connector M102.





2 Check continuity between spiral cable harness connector M30 (A) and M102 (B).






Does the spiral cable check OK?
YES
Inspection End.
NO
Replace spiral cable. Refer to [Spiral Cable: Removal and Installation] Service and Repair.