BMW Cars 1999-06

Wheel Speed Sensors

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The impulse (speed sensors) are located at each wheel and provide the speed reference to the control unit. The sensors are permanently magnetized inductive sensors that read pulses from a tooth wheel on each hub. A voltage signal is generated as each tooth passes through the magnetic field. The sensors are replaceable. The toothed exciter rings are integral with the wheel hub or axle assembly and are replaced with the assembly.

Removal & Installation



Front


Click image to see an enlarged view

Fig. The front ABS impulse sensor is installed in the steering knuckle. The exciter ring is part of the hub assembly

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the front wheels.
  4.  
  5. Open the ABS sensor connector protective box, lift out the connector and detach it.
  6.  
  7. Remove the sensor fastener from upper inside portion of the steering knuckle and remove the sensor.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  

Rear
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the rear wheels.
  4.  
  5. Open the ABS sensor connector protective box, lift out the connector and detach it.
  6.  
  7. Remove the sensor fastener from the top of the rear trailing arm and remove the sensor.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  



Click image to see an enlarged view

Fig. The rear exciter ring is part of the outer CV-joint/drive axle assembly

 
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