Switch, EVIC Control: Operation

The Electronic Vehicle Information Center (EVIC) control switch pod is a resistor multiplexed unit that receives source current from and provides hardwired inputs to the Local Interface Network (LIN) mounted to the left of the steering column on the instrument panel. The LIN slave node communicates the switch states of the EVIC control switch pod, the remote radio switches and the horn switch over the LIN data bus to the Instrument Panel Cluster (IPC), which is the LIN master node.

The EVIC control switch pod (also known as the odometer switch) for vehicles not equipped with the EVIC system contains two switch push buttons whose functions are:

The IPC LIN master node provides a clean ground and fused B(+) current for all of the switches and sensors on the rotating steering wheel through the LIN slave node circuitry of the speed control switch pod as well as for the Light Emitting Diode (LED) backlighting of both the speed control and the EVIC switch pods. The IPC continually monitors the LIN bus data and will store a Signal Not Available (SNA) code for any LIN bus input errors. The IPC also communicates with other electronic modules over the Controller Area Network (CAN) data bus. Therefore, any IPC Diagnostic Trouble Code (DTC) information can be retrieved using a diagnostic scan tool connected to the Data Link Connector (DLC).

The analog resistor multiplexed circuits of the EVIC control switch pod as well as the hardwired circuits between the switch pod and the LIN slave node within the speed control switch pod may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.