Electronic Brake Control Module: Description and Operation

The Electronic Brake Control Module (EBCM) is a small control microprocessor, which monitors the speed of each wheel and the electrical status of the brake pressure modulator valve assembly It is mounted under the left side of the instrument panel above the brake pedal on the DERM bracket. The primary functions of the EBCM are to detect wheel locking tendencies, control the brake system while in antilock mode and monitor the system for proper electrical operation. The EBCM also controls display of ABS diagnostic trouble codes while in diagnostic mode.

The EBCM continuously checks the speed of each wheel to determine if any wheel is beginning to lock. If a wheel locking tendency is detected, the EBCM commands appropriate valve positions to modulate brake fluid pressure in some or all of the hydraulic circuits to prevent wheel lockup and provide optimum braking. The EBCM continues to control pressure in individual hydraulic circuits until a locking tendency is no longer present.

The Antilock Brake System is electrically monitored by the EBCM for proper operation. If the EBCM detects an error, it can disable the antilock function and turn on the amber "ANTILOCK" warning lamp in the instrument panel cluster.