Multi-Function Switch: Operation: Notes

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

The left (lighting) multi-function switch uses resistor multiplexing to control the many functions and features it provides using a minimal number of hard wired circuits. The switch then sends electronic switch status messages over the Local Interconnect Network (LIN) to the Cab Compartment Node (CCN) and then the CCN sends messages over the Controller Area Network (CAN) data bus to the Totally Integrated Power Module (TIPM) other electronic modules in the vehicle.

For lighting and wiper function it sends the messages over the LIN bus to the CCN and the CCN puts them out on the CAN bus to the other modules. The left switch has the microprocessor for all communication to the TIPM. The SCCM is composed of a clockspring and left lighting switch and a right wiper switch. The TIPM, controls the lighting and wiper functions.

The left multi-function switch can be diagnosed using LIN based diagnostic tools and methods. However, the most reliable, efficient and accurate means to diagnose this component requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.