GM Service Manual Online
For 1990-2009 cars only

The steering column components perform functions other than steering. The following components on the steering column perform the described functions:

    • The column
        The column absorbs energy. The column will compress in a front end collision in order to lessen the chance of injury to the driver.
    • The ignition switch and the lock mount on the column
        The ignition and the steering operations will lock in order to inhibit the theft of the vehicle with the column mounted lock.
    • The steering column electric park lock.
        A mechanical lock within the ignition key cylinder prevents the key from moving to the LOCK position when the vehicle is out of the PARK position. This prevents the driver from removing the key when the vehicle is out of the PARK position. Battery voltage is supplied to the Automatic Shift Lock Control park position switch with the ignition key in OFF, RUN, BULB TEST or START position. With the shift lever in the PARK position voltage flows through the closed contacts of the automatic shift lock control park position switch to the steering column electric park lock solenoid. The steering column electric park lock solenoid is permanently grounded and therefore energizes disabling the mechanical ignition key cylinder lock. This allows the driver to turn the ignition key to the LOCK position and remove the key. With the shift lever out of the PARK position the contacts in the automatic transmission shift lock control park position switch open de-energizing the steering column electric park lock solenoid, preventing the driver from moving the ignition key to the LOCK position.
    • The multifunction lever
        The multifunction lever provides control of the following components:
       - The headlamp high-beams
       - The cruise control
       - The windshield wiper and the washer

The column is easily disassembled and reassembled. Use the specified screws, bolts and nuts in order to ensure that the energy absorbing action occurs. Take special care in handling the column when the column is removed from the vehicle.

The plastic fasteners that maintain the column rigidity may shear or loosen if the following conditions exist:

  1. Use of a steering wheel puller other than the recommended puller
  2. A sharp striking on the end of the steering shaft or the shift lever
  3. Something is leaning on the column
  4. A dropped column