Steering Wheel Controls
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The steering wheel controls consist of a series of resistors. Each steering wheel controls switch function corresponds with a specific resistance value within the switch. When a switch is pressed, the Steering Column Control Module (SCCM) monitors the change in reference voltage to determine the requested function. The SCCM sends the switch information to the BCM over the HS-CAN. The BCM gateways the information to the ACM or the APIM over the MS-CAN.