Multi-Function Switch: Operation: Notes

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

The multi-function switch uses a combination of resistor multiplexed and conventionally switched outputs to control the many functions and features it provides. The switch receives battery voltage on a fused ignition switch output (run-acc) circuit from a fuse in the Junction Block (JB) whenever the ignition switch is in the On or Accessory positions. The switch receives a path to ground at all times through a ground stud on the driver side instrument panel end bracket near the Junction Block (JB).

The multi-function switch can be diagnosed using conventional diagnostic tools and methods. However, proper testing of the multiplexed inputs to the Body Control Module (BCM) requires the use of a diagnostic scan tool. Refer to BODY DIAGNOSTIC PROCEDURES .

Following are brief descriptions of how each of the two multi-function switch control stalks operate to control the functions and features they provide.