Steering Wheel Switch - Message Center
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The message center switch is the 5-way portion of the LH steering wheel switch. The message center switch uses different resistance values associated with each specific button (up, down, left, right and OK). The SCCM (without adaptive steering) or Steering Effort Control Module (SECM) (with adaptive steering) sends out a reference voltage to the upper LH steering wheel switch on the input circuit and monitors the voltage drops. The voltage drop varies depending upon the resistance of the specific button pressed, providing indication to the SCCM (without adaptive steering) or Steering Effort Control Module (SECM) (with adaptive steering) which button is pressed.