Ignition Switch: Description and Operation

The ignition switch is located on the steering column. The Key-In-Switch is located in the ignition switch module. For removal/installation of either the key lock cylinder or ignition switch, refer to Ignition Switch and Key Cylinder Removal/Installation.

On vehicles equipped with an automatic transmission and a steering column mounted shifter,an interlock device is located within the steering column. This interlock device is used to lock the transmission shifter in the PARK position when the key is in the LOCKED or ACCESSORY position. The interlock device within the steering column is not serviceable. If repair is necessary, the steering column assembly must be replaced.

On vehicles equipped with an automatic transmission and a floor mounted shifter , a cable connects the interlock device within the steering column assembly, to the transmission floor shift lever. This interlock device is used to lock the transmission shifter in the PARK position when the key is in the LOCKED or ACCESSORY position. The interlock device within the steering column is not serviceable. If repair is necessary, the steering column assembly must be replaced.

Key-in Ignition Switch
The key-in ignition switch is integral to the ignition switch, which is mounted on the right side of the steering column. It closes a path to ground for the Central Timer Module (CTM) when the ignition key is inserted in the ignition lock cylinder and the driver door jamb switch is closed (driver door is open). The key-in ignition switch opens the ground path when the key is removed from the ignition lock cylinder. The ground path is also opened when the driver door jamb switch is open (driver door is closed).

The key-in ignition switch cannot be repaired and, if faulty or damaged, the entire ignition switch must be replaced.