Principles of Operation

Steering Column Switches

Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

Ignition Switch

The ignition switch is controlled by the ignition lock cylinder with a key. When the ignition lock 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 Battery Junction Box (BJB) and the Smart Junction Box (SJB). The ignition switch also contains a key-in-ignition system that allows the SJB to detect when the key has been inserted in the ignition switch. This information is used by the SJB for the brake shift interlock system. For information on the brake shift interlock system, refer to Automatic Transaxle/Transmission External Controls External Controls.

The available ignition switch positions are:

- OFF
- ACC
- RUN
- START

Multifunction Switch

The multifunction switch controls the various components (high-beam headlamps, flash-to-pass, turn signal and windshield wiper) by grounding certain SJB circuits and wiper motor circuits. When the SJB detects the specific ground, it sends a voltage to the appropriate component to activate it. The SJB controls the high-beam headlamps, the flash-to-pass and the turn signals. The high-beam headlamp and the turn signal portion are normally open switches that close when activated. The flash-to-pass switch is a momentary contact switch that grounds the SJB high-beam headlamp circuit. The windshield wipe and wash functions are controlled directly by the multifunction switch, wiper and washer motor.

For exterior lighting concerns, refer to Exterior Lighting Testing and Inspection. For wiper and washer concerns, refer to Wipers and Washers Testing and Inspection.