The Custom Cruise III system contains a built in delay feature when it is first turned on. Specifically, with this system, only after the multi- function lever switch has been in the 'on' position for approximately one to two seconds will the cruise control system engage -- with depression of the set/coast button.
This built in delay could be mis-diagnosed as a malfunctioning cruise control system.
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.