ABS Wheel Speed Sensor - Wiring Revision

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Number: 91-271-5

Section: 5

Date: APRIL 1991

Corporate Bulletin No.: 118108


Subject:
ADDING WIRE COLORS TO ABS
WHEEL SPEED SENSOR ASSEMBLIES


Model and Year:
1991 CAPRICE


SERVICE UPDATE


This bulletin serves to update ELECTRICAL DIAGNOSIS (SECTION 8A) and ANTILOCK BRAKE SYSTEM DIAGNOSIS (SECTION 5E1) of the 1991 "B" Car Service Manual.

Some 1991 "B" cars 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 harness 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 (C106 Terminal "B") and 833 RED (C106 Terminal "A")
872 WHT (C106 Terminal "B") and 833 WHT (C106 Terminal "A")

Please update the 1991 Service Manual art on the pages indicated. 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 specified in Section 8A-44-3 and page 8A-201-25, Figure 35.