Steering Wheel Controls
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. 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 control switch function corresponds with a specific resistance value within the switch. When a switch is pressed, the reference voltage from the switch changes. This voltage change is monitored by the Steering Column Control Module (SCCM), which determines the requested function. A message is then sent from the SCCM through the HS-CAN to the BCM. The BCM converts the high speed message to an MS-CAN message and sends it to the ACM (or APIM) over theMS-CAN.