Checking the power supply and ground for the brake control module (BCM)

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition on.

  Check the fuses in the fusebox in the engine compartment (30-supply) for the brake control module (BCM).

  NOTE:

  If any fuses are blown, check the circuit after the fuse for a short-circuit to ground before replacing the fuse. Then replace the fuse. For further information about the circuit after the fuse, refer to the appropriate wiring diagram.

  Check the fuse in the fusebox in the passenger compartment (15-supply) for the brake control module (BCM).

  If the fuse is blown, check the cable between the brake control module (BCM) and the fuse. Check for a short-circuit to ground.

  If the fuse is intact, check the cable between the control module and the fuse. Check for an open-circuit.

  Check the ground lead between the control module and the ground terminal. Check for an open-circuit. Also check the ground terminal. Check for contact resistance and oxidation.

  Remedy as necessary.

  Other information: 

  • To access or replace the fuses, see Fusebox, passenger compartment, replacing
  • To connect the breakout box, see
  • For information about signals, see Signal specification, brake control module (BCM) with STC/ TRACSSignal specification, brake control module (BCM) with DSTC (dynamic stability and traction control)
  • For information about checking wiring and terminals see Checking wiring and terminals .
  Fig 2: Identifying Breakout Box

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Ohmmeter

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying ABS Control Module

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Checking the brake control module (BCM) 

• NO 

  Refer to Checking communication with the brake control module (BCM)