GM Service Manual Online
For 1990-2009 cars only

Key Identification and Usage


Object Number: 631211  Size: SH

The keys are double sided and reversible. The lock cylinder keyway is designed so that other model keys will not enter a current model lock cylinder. A single key is used for all locks on the vehicle.

The key identification is obtained from the five-character key code stamped on the key code tag (1). The code list, available to owners of key cutting equipment from equipment suppliers, determines the lock combinations from the code numbers.

If the code numbers are not available from the records or from the tags, the key code can be obtained from the right-side door lock cylinder (if the key has not been replaced). Lock cylinders supplied by the factory as service parts are unmarked. If the original key is available a new key can be cut from a blank.

Cutting Keys


Object Number: 631211  Size: SH

After the code has been determined from the code list, perform the following steps:

  1. Cut a blank key to the proper level (2) of each of the tumbler positions (1).
  2. Inspect the key operation in the lock cylinder.

Replacement Lock Cylinders

Replacement lock cylinders are available from the service warehouse as a complete assembly. If repairs to the tumbler are needed, replace it with a new lock cylinder and key.

Assembling and Coding Lock Cylinders

The lock cylinder is serviced as a unit. There are no assembly or coding procedures.