Principles of Operation

Principles of Operation

NOTE: The smart junction box (SJB) is also 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 and windshield wiper/washer) controls the various components electrically. The multi-function switch is hard-wired to the 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 controls a ground signal for the various wiper and washer functions.

For headlamp and turn signal concerns, refer to Lighting and Horns. For wiper and washer concerns, refer to Wiper and Washer Systems.