A new twilight sentinel module, P/N 5976634, has been released to service 1985-1989 Devilles and Fleetwoods, 1984-1989 Broughams, 1984-1985 Eldorados and Sevilles, and 1984-1987 Cimarrons. This module has been revised to prevent repeat failures due to electrical system transients.
Parts are currently available from GMSPO.
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.