At "Instrument Panel: Indicators Cluster, U2E", the Schematic located on Page 8A-80-2 of the Electrical Diagnosis Section 8A, shows two "CHECK OIL" indicators in the instrument cluster printed circuit. The indicator linking terminal A7 and terminal B15 should be labeled "SECURITY" indicator.
Please mark a reference to this bulletin in your copy of the 1991 Ninety-Eight Service Manual.
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.