For 1990-2009 cars

# Change to Rear Wheel Bearing and Speed Sensor Assembly for ABS Equipped Vehicles with Rear Drum Brakes

Subject: | Information on Change to Rear Wheel Bearing and Speed Sensor Assembly for ABS Equipped Vehicles with Rear Drum Brakes

Models: | 1998 Saturn vehicles built after and including VIN WZ206003 equipped with ABS and rear drum brakes (RPO code JM4) and 1999 Saturn vehicles with ABS (RPO code JM4).

Attention: | Please distribute this bulletin to: Parts Manager and all Technicians

### Purpose

The purpose of this bulletin is to communicate a change in the resistance values of the rear ABS wheel speed sensor.

The rear wheel speed sensor was changed to a multi-pole design to improve ABS wheel speed sensor signal clarity. The new multi-pole sensor can be identified by the new white polymer cover. The old steel sensor cover was gold in color. The change was implemented on ABS vehicles equipped with rear drum brakes (RPO JM4) at VIN WZ206003.

Due to assembly limitations the change was not implemented on ABS vehicles equipped with rear disc brakes (RPO JL9).

The new wheel speed sensor resistance values are as follows:

Temperature - Resistance Table
Temp. (C°) | Temp. (F°) | Minimum | Maximum
--- | --- | --- | ---
-34° to 4° | -30° to 40° | 800 ohms | 1120 ohms
5° to 43° | 41° to 110° | 990 ohms | 1210 ohms
44° to 93° | 111° to 200° | 1505 ohms | 1600 ohms

The new wheel bearing and sensor assembly can be used to service all 1991-1999 Saturn vehicles with ABS (RPOs JL9 or JM4).