Steering Switch

STEERING SWITCH





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, [1][2]Collision Avoidance and Parking Assist Systems.
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. Service and Repair.
2.CHECK HARNESS BETWEEN SPIRAL CABLE AND BLUETOOTH CONTROL UNIT





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 harness.
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 - GO TO 4
NO - Replace spiral cable. Service and Repair.
4.CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND AUDIO UNIT
1. Disconnect audio unit connector M45.
2. Check continuity between Bluetooth control unit harness connector B141 and audio unit harness connector M45.






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






Are the continuity results as specified?
YES - GO TO 5.
NO - Repair harness.
5.CHECK AUDIO UNIT VOLTAGE
1. Connect audio unit harness connector M45 and Bluetooth control unit harness connector B141.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M45 terminals.






Are the continuity results as specified?
YES - Replace Bluetooth control unit. Service and Repair.
NO - Replace audio unit. Removal And Installation Premium Audio.