Steering Wheel Switch - Message Center

The message center switch portion of the LH steering wheel switch is comprised of 5 buttons. Each button operates a unique switch within the message center switch portion of the LH steering wheel switch assembly. Each button uses a different resistance value. The SCCM  sends out a reference voltage to the LH steering wheel switch on the input circuit and monitors the voltage drop when a message center switch button is pressed. The voltage drop varies depending upon the resistance of the specific button pressed, indicating to the SCCM  which switch is pressed.