Checking The Connectors On The Brake Control Module (BCM) And Wheel Sensor

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Connecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Check the connectors on the brake control module (BCM) and the wheel sensor. Check for contact resistance. Check for oxidation
  NOTE:

  Check if the wheel sensor cable is fault-free and correctly installed. A defective lead must be replaced, repair is not allowed.

  For information on correct mounting:TRANSMISSION INPUT SPEED SENSOR, FRONT WHEELS

• Reinstall the components, connectors, etc.
• Raise the car so that the relevant wheel is clear of the ground
• Ignition on
• Read off the wheel speed for the relevant wheel.

  Spin the relevant wheel and check that the wheel speed is updated.

  If the wheel speed is updated, the cause of the fault was loose connections in the connectors on the brake control module (BCM) or wheel sensor.

  NOTE:

  The speed signal will only be active for approximately 20 seconds. Activate the function again if necessary.

  Other information 

  • see TRANSMISSION INPUT SPEED SENSOR REAR WHEELS
  • see TRANSMISSION INPUT SPEED SENSOR, FRONT WHEELS
  • see ANTI-LOCK BRAKE SYSTEM MODULE (ABS)
  • see CHECKING WIRING AND TERMINALS
  • see ANTI-LOCK BRAKE SYSTEM (ABS) WIRING 
  Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the wheel speed updated? 

• YES 

  OKAY:  Troubleshooting has been completed.

• NO 

  see CHECKING THE WIRING AND SENSORS