Checking the connectors for the control module 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 wheel sensor and brake control module (BCM) connectors. Check for contact resistance and oxidation
• Reinstall the components, reconnect the 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 for the control module or wheel sensor.

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

  Other information 

  • To disconnect the wheel sensor connector, see Wheel sensors, rear, replacing
  • To disconnect the control module connector, see
  • See Checking wiring and terminals
  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 

  Refer to Checking wiring and sensors