Test G

PINPOINT TEST G: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE-STEERING WHEEL AUDIO CONTROL SWITCH(ES)

Test G1:

Test G2-G3:

Test G4-G5:

Test G6-G8:

Normal Operation
The steering wheel audio control switch(es) 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 583 (YE) 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 powertrain control module (PCM), circuit 848 (DG/OG).

Possible Causes
- circuit 583 (YE) open or short to ground
- circuit 848 (DG/OG) open or short to ground
- steering wheel audio controls ground circuit open
- steering wheel audio controls
- steering wheel control switch harness
- audio unit
- PCM