Lock Cylinder Tumbler Operation
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Each of the 4 cut depths on the key has a corresponding double-throw tumbler. The cut depth number is stamped on each tumbler for identification.
The I/P compartment door lock cylinder uses tumblers that are self-retaining. The I/P compartment door lock cylinder also requires a retaining tumbler that does not move when the key is inserted. This function is to retain the lock cylinder in the corresponding latch assembly.
Some common tumblers that are NOT self-retaining include the following:
- The ignition lock cylinder
- The front side door lock cylinder
- The rear compartment lid lock cylinder