GM Service Manual Online
For 1990-2009 cars only

The automatic transmission uses a park lock system. This system uses a flexible automatic transmission park lock cable. The cable is attached at one end to the automatic transmission control lever and at the other end to the ignition switch. The ignition switch is mounted to the column where it actuates a locking pin. The locking pin engages an ignition switch sliding contact when the lever is in the REVERSE position. This action does not allow the ignition switch to move to the LOCK position.

With the lever in PARK and the ignition switch slider in LOCK, the following actions occur:

    • The locking pin engages a cam on the cable.
    • The locking pin prevents the lever from moving into another position.

Vehicles with a manual transmission have a steering column key release lever. A manual transmission clutch start switch is also used. Depress the clutch in order to crank the engine.