Principles of Operation

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The smart junction box (SJB) may also be identified as the generic electronic module (GEM).

Ignition Switch - The ignition switch is controlled by the ignition lock cylinder with a key. When the ignition cylinder is turned using the key, a mechanical connection positions the ignition switch to the selected position and allows the ignition switch to send voltage to specific components. The ignition switch is contained in the steering column lock module, if a new ignition switch needs to be installed, then a new lock module must be installed.

Multi-function Switch - The multi-function switch (flash-to-pass, high beam, turn signal, windshield wiper/washer and rear wiper/washer) controls the various components electrically. The multi-function switch is hard-wired to the smart junction box (SJB) and controls a ground signal for the high beam, flash-to-pass and turn signal functions. The multi-function switch is also hard-wired to the smart wiper module and the rear wiper module, and controls a ground signal for the various wiper and washer functions.

For headlamp and turn signal concerns, refer to EXTERIOR LIGHTING . For wiper and washer concerns, refer to WIPERS AND WASHERS .