Checking The Power Supply And Ground For The Brake Control Module (BCM)

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS CORPORATION

• 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.

  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 CONNECTING THE BREAKOUT BOX
  • For information about signals, see SIGNAL SPECIFICATION, BRAKE CONTROL MODULE (BCM) WITH STC/ TRACS (vehicles with STC/ TRACS), or SIGNAL SPECIFICATION, BRAKE CONTROL MODULE (BCM) WITH DSTC (DYNAMIC STABILITY AND TRACTION CONTROL) (vehicles with DSTC (dynamic stability and traction control)
  • For information about checking wiring and terminals, see CHECKING WIRING AND TERMINALS .
  Fig 2: Breakout Box

  Courtesy of VOLVO CARS CORPORATION
  Fig 3: Identifying Ohm Meter

  Courtesy of VOLVO CARS CORPORATION
  Fig 4: ABS Control Module

  Courtesy of VOLVO CARS CORPORATION

Was a fault detected? 

• YES 

  Refer to CHECKING THE BRAKE CONTROL MODULE (BCM) 

• NO 

  Refer to CHECKING COMMUNICATION WITH THE BRAKE CONTROL MODULE (BCM)