HUD Control - Steering Wheel Switch

The HUD menu functions are controlled through the RH upper steering wheel switch up and down toggle switch and back buttons. The RH steering wheel switch uses different resistance values associated with each specific button. The SCCM sends out a reference voltage to the RH 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 which button is pressed.