Test F: The Auxiliary Audio Control Is Inoperative - Steering Wheel Controls

PINPOINT TEST F: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE - STEERING WHEEL CONTROLS

F1:

F1-F2:

F3-F4:

F5-F6:

Normal Operation
The steering wheel controls consist of a specific resistor value for each button function creating a voltage divider. When a button is pressed, a specific voltage is sent to the audio unit. The audio unit uses this voltage to determine which input function has been selected. Circuit 595 (LB/RD) is the reference voltage circuit between the steering wheel controls and the audio unit.

Possible Causes
- Circuit 595 (LB/RD) open or short to ground
- Circuit 57 (BK) open
- Clockspring
- Steering wheel controls
- Audio unit