Electronic Brake Control Module: Description and Operation
ANTI-LOCK BRAKE CONTROL MODULE INPUTSThe Anti-lock Brake Control Module processes inputs from the Brake On/Off (BOO) Switch, and the 4 Wheel Speed Sensors (one at each wheel).
The Brake On/Off (BOO) Switch monitors brake pedal position. When the brake pedal is depressed, the Brake On/Off (BOO) Switch contacts close and apply voltage to the Antilock Brake Control Module. This input alerts the Anti-lock Brake Control Module that a stop is in progress.
Each of the four Wheel Speed Sensors generates a varying voltage signal that is proportional to wheel speed. The Anti-lock Brake Control Module monitors the Wheel Speed Sensor signals and compares them to determine if Anti-lock Brake System operation is required.
MODULE OUTPUTS
The Anti-lock Brake Control Module controls the operation of the Solenoid Relay. The Motor Relay, the ANTI-LOCK Warning Indicator and the Hydraulic Actuator Assembly.
The Solenoid Relay is grounded by the Antilock Brake Control Module to power up the system. The Anti-lock Brake Control Module also grounds the Motor Relay to run the Pump Motor during anti-lock cycling.
The Anti-lock Brake Control Module controls wheel lock up by pulsing the solenoid valves in the Hydraulic Actuator Assembly.
The Anti-lock Warning Indicator bulb is grounded by the Anti-lock Brake Control Module to illuminate the Indicator. The Indicator is illuminated for several seconds during System power-up and when the Anti-lock Brake Control Module detects a problem with the Anti-lock Brake System.