SERVICE MANUAL UPDATE SEC. 8A ADDING WIRE COLORS-ABS SENSORS. Oldsmobile Custom Cruiser 1991

For 1990-2009 cars

# SERVICE MANUAL UPDATE SEC. 8A ADDING WIRE COLORS-ABS SENSORS

#### SUBJECT: SERVICE MANUAL UPDATE REVISED ABS WIRING DIAGRAMS AND DIAGNOSIS

#### MODELS/YEARS: 1991 CUSTOM CRUISER

This bulletin updates the 1991 Custom Cruiser Service Manual for Sections 5E1 Antilock Brake System Diagnosis and 8A, Cell 44 Electrical Diagnosis.

Some 1991 Custom Cruisers have been built with wire colors that differ from those specified in the 1991 Service Manual. The wires in question are part of the ABS wheel speed sensor circuits. These wires are covered with a protective jacket over the length of the wheel speed sensor harness and are only viewable at the terminating connectors. For the left front and rear axle speed sensors the terminating connector is the EBCM harness connector. For right front speed sensor the wires terminate at the forward lamp har- ness connector C106. The possible combinations are as follows:

#### Possibilities:

LH FRONT WHEEL SPEED SENSOR 830 YEL (EBCM Terminal "6") and 873 YEL (EBCM Terminal "4") 830 BLU (EBCM Terminal "6") and 873 BRN (EBCM Terminal "4") 830 BRN (EBCM Terminal "6") and 873 BLU (EBCM Terminal "4") REAR AXLE WHEEL SPEED SENSOR 882 WHT (EBCM Terminal "7") and 883 WHT (EBCM Terminal "9") 882 BRN/RED (EBCM Terminal "7") and 883 BLU/RED (EBCM Terminal "9") 882 BLU/RED (EBCM Terminal "7") and 883 BRN/RED (EBCM Terminal "9") RH FRONT WHEEL SPEED SENSOR 872 RED (Cl 06 Terminal "B") and 833 RED (Cl 06 Terminal "A") 872 WHT (Cl 06 Terminal "B") and 833 WHT (Cl 06 Terminal "A")

Pages 2 and 3 contain the revised wiring diagrams and references to what pages in the 1991 Custom Cruiser Service Manual are affected.

Also, please note that the forward lamp harness connector C106, part of the right front wheel speed sensor circuit, is a 2-way connector, not a 3-way connector as specffied in page 8A-44-3 and page 8A-201-25, Figure 35.

Revised Diagnosis, Chart B.

Chart B that appears on page SE1 -49 of the 1991 Custom Cruiser has been revised. The revised page is on page 4 of this bulletin.

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.