Component Description

Message Center

Component Description

Steering Wheel Switch - Message Center

The message center switch portion of the LH (Left Hand) steering wheel switch is comprised of 5 buttons. Each button operates a unique switch within the message center switch portion of the LH (Left Hand) steering wheel switch assembly. Each button uses a different resistance value. The SCCM (Steering Column Control Module) sends out a reference voltage to the LH (Left Hand) 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 (Steering Column Control Module) which switch is pressed.

Low Washer Fluid Level Sensor

The low washer fluid level sensor is a reed type switch. The float assembly uses a magnet to close the contacts on the switch. The low washer fluid sensor is hardwired to the IPC (Instrument Panel Cluster) through a single signal wire and is grounded to a body ground through a separate circuit. The IPC (Instrument Panel Cluster) provides a battery reference voltage to the low washer fluid level sensor. When the washer fluid level is low, the float drops closing the switch and pulling the reference voltage low. When the washer fluid level is high, the float lifts off the switch and opens the circuit to the IPC (Instrument Panel Cluster) sending the reference voltage high.