Handle & Lock Cylinder - Rear Door Outside: Notes
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
New lock cylinders are available as replacement parts. If the door lock cylinders require replacement for any reason, apply a coating of lubricant. Use GM P/N 12346241 or the equivalent, inside the lock case and the cylinder keyway prior to assembling and installing the cylinder.
Refer to BINDING LOCK CYLINDERS in Doors in order to repair a binding lock cylinder.