Electronic Brake Control Module
The Electronic Brake Control Module (EBCM) (1) incorporates antilock braking, traction control and electronic stability program (ABS-TCS/ESP). The EBCM (1) is integrated with the Brake Modulator Assembly (2) to form one assembly.
Electronic Brake Control Module Inputs
The EBCM constantly monitors and processes input signals and data from the following:
- Battery positive voltage
- Brake fluid level switch
- Brake pedal position sensor (Data from the BCM)
- Brake vacuum sensor
- Chassis expansion data communication circuit
- Communication enable voltage
- G-MAN high speed data communication circuit
- Steering angle sensor
- Traction control switch (Data from the BCM)
- Wheel speed sensors
- Yaw rate sensor
Electronic Brake Control Module Outputs
Based on the input signals received, the EBCM activates the following actuators:
- Hydraulic modulator solenoid valves
- Hydraulic modulator pump motor
- Brake vacuum pump relay
The EBCM relays data to the following:
- Instrument panel cluster
- Diagnostic link connector
- G-MAN high speed data communication circuit
- Chassis expansion data communication circuit
Electronic Brake Control Module Self-test Initialization Sequence
When the ignition is switched on and the vehicle exceeds approximately 15 km/H. the EBCM performs a Self-test Initialization Sequence. After the Self-test is complete the EBCM constantly monitors the ABS-TCS/ESP system for faults.
The Self-test Initialization Sequence may be heard and felt while it is taking place, which is considered part of the normal system operation.
During the Self-test Initialization Sequence, the EBCM activates the hydraulic modulator cycling each of the solenoid valves as well as operate the pump motor to check for correct component operation. If the pump or any solenoid valves fail to operate, the EBCM sets the appropriate diagnostic trouble code (DTC).
After the Self-test Initialization Sequence is completed the EBCM continuously monitors inputs and outputs by comparing the logical sequence of input and output signals with the normal operating parameters stored in the EBCM. If any of the input or output signals are outside the normal operating parameters, the EBCM sets the appropriate DTC.