Steering Wheel Switch - Message Center

The message center switch is the upper LH  steering wheel switch and is comprised of 5 buttons. The message center switch uses different resistance values associated with each specific button. The IPC  sends out a reference voltage to the upper LH  steering wheel switch on the input circuit and monitors the voltage drop. The voltage drop varies depending upon the resistance of the specific button pressed, providing indication to the IPC  which switch is pressed.