REAR WHEEL ABS SPEED SENSOR REPAIR PROCEDURE

Subject: REAR WHEEL ABS SPEED SENSORS (REPLACE REAR WHEEL BEARING ASSEMBLY)

Models Affected: 1989-90 GRAND PRIX MODELS

Condition: Malfunction of rear wheel ABS Speed Sensor on some 1989-90 Grand Prix models. ABS dash light comes on, ABS Diagnostics points to the rear sensor. If the ABS light is on, only the anti-lock feature is in- operative. The normal brake system is still 100% functional.

Cause: The malfunction may be caused by water intrusion past the seal on the ABS Sensor.

Correction: The ABS Sensor is not serviced separately, replace the rear wheel bearing assemblies with P/N 7466987 bearings.

Part is currently available from GMSPO.

If a vehicle encounters this condition, both rear wheel bearing assemblies should be replaced.

Bearings with an improved seal entered production with the VIN lG2WT54T7LF260940.

IMPORTANT: ---------- When removing the ABS electrical connector, refer to the following illustrations to insure against damaging any part of the connector which uses CPA (connector position assurance) locking pins.

Labor Operation Number: T1680

Labor Time: 1.2 Hours

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.