When one of the steering wheel audio control switches is pushed, the resistance in the steering switch circuit changes depending on which button is pushed.
STEERING SWITCH
Diagnosis Procedure
1.CHECK HARNESS
Turn ignition switch OFF.
Disconnect AV control unit connector M46 and spiral cable connector M30.
Check continuity between AV control unit connector M46 terminals 25, 26, and 27 and spiral cable connector M30 terminals 24, 31, and 33.
Check continuity between AV control unit connector M46 (A) and ground.
Are the continuity test results as specified?
YES >> GO TO 2
NO >> Repair harness. 2.SPIRAL CABLE CHECK
Disconnect spiral cable connector M88.
Check continuity between spiral cable harness connector M30 and M88.