Technicians cannot use quick checker J 34185 tool only as Chart #1 indicates in Section 8A-34-4 of the 1992 Buick Skylark Service Manual.
For proper system diagnosis, use Tool J 34185 with adapter tool J 34185-89 and follow the revised cruise control K34 Chart #1 Isolation Test.
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.