For 1990-2009 cars

# SERVICE MANUAL UPDATE SEC. 8A-INSTRUMENT PANEL

#### MODELS AFFECTED: 1990 RIVIERA

Some early production Rivieras received a wiring harness modification and/or a unique Instrument Panel Cluster (IPC) at time of assembly. The modifications affect cluster ground wiring and compatibility.

VIN 400938-401422: Received a modified wiring harness. Refer to Figure 1. All modified harnesses have a band of red tape on the harness two inches from the IPC connector (visible with IP removed).

VIN 400938-401382: Received a cluster identified by a green sticker on the top of the unit in addition to the modified harness. These green stickered clusters will not function correctly without the modified harness. Do not transfer a green stickered cluster into a vehicle outside this VIN range.

Please note these changes in Cell 8A-82 of the 1990 Buick Riviera/Reatta Final Service Information Manual.

IPC service parts are available as an exchange unit through authorized AC-Delco Service Centers. Clusters available through GMSPO are for fire and theft replacement only.

All clusters in GMSPO and Delco Exchange Center stock will function properly in any 1990 Riviera. Green stickered clusters will be reworked when returned for repair to assure compatibility with all 1990 Rivieras and Reattas.

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.