Test F
PINPOINT TEST F: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE - STEERING WHEEL AUDIO CONTROLSTest F1:
Test F2:
Normal Operation
The steering wheel audio controls consist of a specific resistor value for each button function, creating a voltage divider. When a button is pressed, a specific reference voltage is sent to the audio unit. The audio unit then uses this reference voltage to determine which control input function has been selected. Circuit 595 (LB/RD) is the reference voltage circuit between the steering wheel audio controls and the audio unit. The ground circuit for the steering wheel audio controls is through the steering column and speed control servo.
Possible Causes
- circuit 595 (LB/RD) open or short to ground
- circuit 848 (DG/OG) open
- steering wheel audio controls switches
- audio unit