Principles of Operation

Principles of Operation

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 the central junction box (CJB) to be distributed to various components and systems.

Multi-function Switch
The multi-function switch controls the various components electrically. The headlamp switch sends constant voltage to the headlamps when placed in the ON position, while the flash-to-pass is a momentary switch used to send voltage to the headlamp high beams only. The headlamp high beam/low beam switch sends voltage to the low or high beam headlamps while the headlamps are ON.

The turn signal switch portion of the multi-function switch operates the left and right turn signals. The windshield wiper switch function uses a ground signal to activate the various wiper modes and the wiper/washer.

For exterior lighting concerns, refer to Lighting and Horns. For wiper and washer concerns, refer to Wiper and Washer Systems.