For 1990-2009 cars

# SERVICE MANUAL UPDATE SEC. 8A ELEC. DIAG./ABS SENSOR WIRING

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

#### VEHICLES AFFECTED: 1991 'E' REATTAS

1991 Reattas built before VIN breakpoint 900577 are wired differently than is shown in the 1991 Riviera/Reatta Service Information Manual. 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.