Brake System Control Module
DESCRIPTION
The Brake System Control Module (BSCM) (3) is located in the left rear corner of the engine compartment, secured to the Hydraulic Control Unit (HCU) (2).
The BSCM, HCU and the Fluid Reservoir (1) comprise the Electronic Brake Booster (EBB).
OPERATION
The BSCM controls the valve body, pump motor, low pressure accumulators, inlet valves, outlet valves and noise attenuators in the HCU. Accumulators in the valve body store extra fluid released from the calipers during an ABS event operation. The motor is controlled by the BSCM. The valves modulate brake pressure during antilock braking and are controlled by the BSCM. During antilock braking, the solenoid valves are opened and closed as needed. They are cycled rapidly and continuously to modulate pressure and control wheel slip and deceleration. Brake Traction Control and Electronic Stability Program modulate pressure on each wheel individually without any driver brake input. The valves are all contained in the valve body portion of the HCU.
The BSCM is serviced separately from the HCU.
The BSCM is powered by two 50 amp fuses in the Power Distribution Center (PDC). The BSCM receives an ignition RUN/START feed from a 10 amp fuse in the PDC.
For more information on how the BSCM operates in the various braking systems. Refer to DESCRIPTION AND OPERATION .