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

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

Normal Operation
There are 4 different steering wheel controls configurations:
- Non-navigation, without the SYNC system
- VOL-, VOL+, SEEK-, SEEK+, MEDIA

- Non-navigation, with the SYNC system
- VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA, PHONE, OK

- Navigation, without the SYNC system
- VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA

- Navigation, with the SYNC system
- VOL-, VOL+, SEEK-, SEEK+, VOICE, MEDIA, PHONE

The VOL-, VOL+, SEEK+, SEEK-, and MEDIA buttons are always wired to the audio control module (ACM). Voltage is sent from the ACM to the steering wheel controls through circuit VME14 (GY/YE), and the ACM grounds the reference voltage through circuit RME24 (BU/WH).

For vehicles equipped with navigation, but not the SYNC system, the VOICE button is wired to the ACM.

For vehicles equipped with the SYNC system, the VOICE (an icon of someone speaking), PHONE (an icon of a phone with an up and down arrow), and OK buttons are wired directly to the accessory protocol interface module (APIM) unless the vehicle is equipped with navigation, in which case there is no OK button, and the VOICE and PHONE buttons are wired to the ACM. Voltage is sent from the APIM (or ACM if equipped with navigation) to the steering wheel controls through circuit VME54 (BU/OG), and the APIM (or ACM if equipped with navigation) grounds the reference voltage through circuit RME54 (WH/VT).

When a switch is pressed, the voltage is routed through a specific resistor value for each function. The ACM (or APIM) then uses this reference voltage to determine which control input function has been selected.

- DTC B1117 (Audio Steering Wheel Button Stuck) - set by the ACM or the APIM (depending on vehicle configuration) when a steering wheel control button is detected as active for greater than 120 seconds during normal operation, or for any duration during the self-test.
- DTC B1136 (Audio Steering Wheel Switch #2 Circuit Failure) - set by the ACM or the APIM (depending on vehicle configuration) when the reference voltage to the steering wheel controls is out-of-range. This can be caused by a number of different failures on the steering wheel controls circuit, except for a short to ground in circuit RME54 (WH/VT). This DTC only applies to the VOICE, PHONE, and OK buttons.
- DTC B2404 (Audio Steering Wheel Switch Circuit Fault) - set by the ACM when the reference voltage to the steering wheel controls is out-of-range. This can be caused by a number of different failures on the steering wheel controls circuit, except for a short to ground in circuit RME24 (BU/WH). This DTC only applies to the VOL-, VOL+, SEEK+, SEEK-, and MEDIA buttons.

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

F1-F2:

F2-F4:

F4-F6:

F6-F8:

F9: