GM Service Manual Online
For 1990-2009 cars only

All automatic transaxle models use a park lock ignition system. The system uses a flexible cable actuator . The cable actuator attaches in the following locations:

    • At one end to the shift control assembly
    • At the other end to the column housing assembly

An actuator on the park lock cable slider engages when the shift lever is in any gear other than PARK. The actuator does not allow the lock cylinder to move to the LOCK position. When the shift lever returns to PARK, the actuator disengages from the cable slider. The actuator allows the lock cylinder to move to the LOCK position. When the following conditions occur, the actuator in the column housing prevents the shift lever from pulling out of park:

    • The shift lever is in PARK.
    • The lock cylinder is in LOCK.

The manual transaxle assembly uses a push button lock housing assembly. The vehicle uses a clutch start switch. The engine will not crank unless you depress the clutch pedal.

The park lock/brake transmission shift interlock system is a safety feature that serves the following purposes:

    • Prevents the gear shift lever from moving out of PARK when the lock cylinder is in the LOCK position
    • Prevents the lock cylinder from moving to the LOCK position unless the shifter is in PARK
    • Prevents the car from shifting out of PARK unless a foot is on the brake

Refer to Park Lock Cable Replacement in Automatic Transaxle.