Ignition Switch: Description and Operation

Circuit Description
The ignition/start switch, in addition to controlling the operation of the starter, controls distribution of electrical power to most circuits in the fuse/relay panel and throughout the car.

Power from the "30" circuit in the fuse/relay panel (connected to battery + at all times) is routed through the ignition switch and back to the fuse/relay panel. The ignition switch supplies power to the "15" circuit in the fuse/relay panel whenever it is in the "On" or "Start" position.

In the "On" position power from the ignition switch actuates the load-reduction relay to power the "X" or load reduction circuit in the fuse/relay panel when the ignition switch.

In the "Start" position, the ignition/start switch also actuates the starter solenoid (terminal 50) which in turn actuates the starter. (On automatic transmission cars, this starter solenoid circuit includes the automatic transmission relay).


WARNING: The driver-side airbag is an explosive device. Before removing the steering wheel or steering column switches, always disconnect the airbag power-supply connector. For more information refer to "Air Bag Systems".