Steering Wheel Switches
WARNING: This page is about a different car, the 2017 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. The switches are an input to the SASM. The switch signals are sent across a dedicated LIN circuit to the BCM, which sends messages on the HS-CAN to the PCM to control the cruise control system.