Electronic Brake Control Module (EBCM)

The controlling element of ABS VI is a microprocessor based Electronic Brake Control Module (EBCM). Inputs to the system include three wheel speed sensors, the brake switch, ignition switch, and unswitched battery voltage. Outputs include three bi-directional motor controls, three indicator controls, two solenoid controls, and the system enable relay. A serial data line, located in terminal 9 of the Data Link Connector (DLC), is provided for service diagnostic tools and assembly plant testing. The EBCM monitors the speed of each wheel. If any wheel begins to approach lock-up and the brake switch is on, the EBCM controls the motors and solenoids to reduce brake pressure to the wheel approaching lock-up. Once the wheel regains traction, brake pressure is increased until the wheel again begins to approach lock-up. This cycle repeats until either the vehicle comes to a stop, the brake is released, or no wheels approach lock-up. Additionally, the EBCM monitors itself, each input (except the serial data line) and each output for proper operation. If any system malfunction is detected, the EBCM will store a DTC in nonvolatile memory (DTC's will not disappear if the battery is disconnected).

NOTE: There is no serviceable or removable PROM. The EBCM must be replaced as an assembly.