1989 Toronados use a new outside mirror control switch. When servicing a 1986-1988 Toronado mirror switch, order P/N 3634778, which includes a switch, terminals, connector body, and instructions for installing the switch.
This kit must be used in place of P/N 25535944.
P/N 25535944 was not superseded because it is used for other applications.
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.