If theft deterrent system sounds when unlocking either front door with key, the lock rod from lock cylinder to lock may be too long, restricting full travel of lock cylinder switch. This could also create an inoperative condition of the two stage automatic door lock feature on cars so equipped.
This operation, to be performed on left door only, if car has one or both options, and on right door only if car has theft deterrent AU4 .
Shorten Rod.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.