Test H: The Auxiliary Audio Control Is Inoperative/Does Not Operate Correctly - Steering Wheel Controls

PINPOINT TEST H: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - STEERING WHEEL CONTROLS

H1:

H1-H2:

H3-H6:

H6-H8:

H8-H9:

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 8-MD26 (WH/BK) is the reference voltage circuit between the steering wheel controls and the audio unit.

Possible Causes
- Circuit 8-MD26 (WH/BK) open or short to ground
- Circuit 31S-MD26 (BK/RD) open
- Steering wheel controls
- Audio unit
- Clockspring
- Powertrain control module (PCM)
- Horn switch harness