Anti-Lock Brake Control Module

The anti-lock brake system (ABS) is controlled by the anti-lock control module. The anti-lock brake control module receives wheel speed readings from each anti -lock brake sensor and uses the information to compare wheel speeds. By continuously monitoring and comparing the rotational speed of each wheel, the anti-lock brake control module activates the ABS only when it senses wheel lockup under severe braking conditions. The anti-lock brake control module decides which wheel is to be controlled and sends the appropriate signals to the hydraulic control unit (HCU). The anti-lock brake control module has self diagnostics capabilities and stores diagnostic trouble codes (DTCs) in its memory. If a trouble code is present in the anti-lock brake control module memory, the yellow ABS warning indicator will illuminate when the engine is running. The anti-lock brake control module is part of the EHCU.