GM Astro/Safari 1985-1996 Repair Guide

Rear Wheel Speed Sensor

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TESTING



See Figure 1



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Fig. Fig. 1: Rear wheel speed sensor resistance chart

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support with jackstands. Remove the wheel and tire assembly.
  4.  
  5. Disconnect the rear wheel speed sensor.
  6.  
  7. Measure the resistance of the sensor and compare to the chart.
  8.  
  9. Replace the sensor if the resistance does not meet specification.
  10.  

REMOVAL & INSTALLATION



See Figures 2, 3, 4 and 5



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Fig. Fig. 2: Rear wheel speed sensor



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Fig. Fig. 3: Rear wheel speed sensor wiring harness routing



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Fig. Fig. 4: The tone ring splines need to be clean to work properly



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Fig. Fig. 5: Rear wheel speed sensor mounting. Axle is removed for clarity

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support with jackstands.
  4.  
  5. Remove the rear wheels.
  6.  


CAUTION
Some brake pads contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

  1. Remove the brake drum and primary brake show.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the 2 bolts and sensor by pulling the wire through the hole in the backing plate.
  6.  

To install:
  1. Install the sensor, bolts and torque to 26 ft. lbs. (35 Nm).
  2.  
  3. Connect the electrical connector.
  4.  
  5. Install the primary shoe, brake drum and rear wheel. Torque the lug nuts to 100 ft. lbs. (136 Nm).
  6.  
  7. Connect the negative battery cable and check operation.
  8.  

 
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