Test E: The Auxiliary Audio Control Is Inoperative - Steering Wheel Controls
PINPOINT TEST E: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE - STEERING WHEEL CONTROLSE1:
E2-E3:
E4-E5:
E6-E7:
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