SERVICE MANUAL UPDATE SEC. 8A CRUISE MODULE BRAKE SWITCH

SUBJECT: CRUISE CONTROL MODULE MECHANIZATION, NORMAL BRAKE SWITCH STATE

MODELS/YEARS: 1992 CUSTOM CRUISER

1992 'B' cars were built with a cruise control module that has to have the brake signal input pulled low at terminal 'G' for cruise control to function. This is accomplished by a small amount of current flowing from the cruise module, through circuit 820, to the Center High Mounted Stop Lamp (CHMSL) bulb to ground. When the brakes are applied and the brake switch closes, the cruise module and circuit 820 receive BATT (battery) voltage. This allows the CHMSL bulb to illuminate and the cruise module to sense that the brakes are applied. The brake switch mechanization, as shown on page 8A-34-0, has been re-drawn to show it in the 'normally open' state. The new diagram is printed on the back of this bulletin.

In addition, please add the following to step 2 of the Troubleshooting Hints on page 8A-34-1 of your Custom Cruiser Service Manual.

Make sure that the Center High Mounted Stoplamp is working. If not, the Cruise Control Module will be disabled.

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.