Test G: The Steering Wheel Controls Are Inoperative/Do Not Operate Correctly

PINPOINT TEST G: THE STEERING WHEEL CONTROLS ARE INOPERATIVE/DO NOT OPERATE CORRECTLY

Normal Operation
Voltage is sent from the audio control module (ACM) to the steering wheel controls through circuit VME14 (GY/YE). When a switch is pressed, the voltage is routed through a specific resistor value for each function. The ACM grounds this reference voltage through circuit RME24 (BU/WH). The ACM then uses this reference voltage to determine which control input function has been selected.

- DTC B1117 (Audio Steering Wheel Button Stuck) - sets when a steering wheel control switch is detected as active for more than 120 seconds during normal operation, or for any duration during the self-test. A short to ground on VME14 (GY/YE) should not set this DTC, as the reference voltage would fall out-of-range, resulting in DTC B1136 or B2404 being set.
- DTC B1136 (Audio Steering Wheel Switch #2 Circuit Failure) - sets when the return voltage from the steering wheel controls is out-of-range, either during normal operation or during the on-demand self-test. This can be caused by any failure on the steering wheel controls circuit except a stuck button. This DTC is only set by the navigation audio system.
- DTC B2404 (Audio Steering Wheel Switch Circuit Fault) - sets when the return voltage from the steering wheel controls is out-of-range, either during normal operation or during the on-demand self-test. This can be caused by a number of different failures on the steering wheel controls circuit, except a short to ground in circuit RME24 (BU/WH) or a stuck button.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Clockspring
- Steering wheel controls
- ACM

G1-G2:

G2-G4: