SERVICE MANUAL UPDATE SEC. 8A ELECTRICAL DIAGNOSIS

SUBJECT: SERVICE MANUAL UPDATE - SECTION 8A ELECTRICAL DIAGNOSIS - PROPER ABS REAR WHEEL SPEED SENSOR WIRING

MODELS AFFECTED: 1991 REATTA MODELS

1991 Reattas built before VIN breakpoint 900577 are wired differently than is shown in the 1991 Riviera/Reatta Service Information Manual, page 8A-44-2. On these cars wiring for the right and left rear wheel speed sensors is reversed. Please mark the following changes for Reattas built before VIN breakpoint 900577 only:

o Circuit 882 (brown) goes to EBCM pin 8 o Circuit 883 (white) goes to EBCM pin 9 o Circuit 884 (black) goes to EBCM pin 24 o Circuit 885 (red) goes to EBCM pin 26

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.