MEMORY SEAT CONTROL MODULE 'LOCK UP' NEW P/N

VEHICLES AFFECTED: 1990 "C" CARS

VIN BREAKPOINTS:1990 CADILLACS: VEHICLES UP TO #228653 1990 BUICKS: VEHICLES UP TO #604581

The memory seat control module may lock up during manual adjustment of the driver's seat, disabling the driver's seat. The module may be reset to normal operation temporarily by either disconnecting the power feed connector to the module or by pulling the power feed circuit breaker (#24). The module is likely to lock up again with subsequent seat adjustment. The module will not return to its normal low-current mode when locked up; some cars may exhibit drained batteries if unused for several days.

REPAIR PROCEDURE:

Memory modules with GM Part # of 20564797 and a date code of 9G20 (July 20,1989) or after may be susceptible to the lockup condition. Parts with a date code prior to 9G29 are not susceptible.

Remove memory seat module and replace with new service part number 25556224. Modules with Part Number 20564797 and a date code after 9G20 must not be used; all such modules should be returned to CANSPO for eventual return to the source.

The seat may be made to operate as a manual seat while waiting for a replacement module hy connecting together the 6-way body harness connector from the switches and the 6-way connector to the seat motors. The module power connector must be disconnected to prevent draining the battery when the module is in the locked up state.

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.