Anti-Lock Brake System (ABS) Module

The ABS module is attached directly to the HCU and is the ECU for all of the ABS and stability control systems. The ABS module monitors all sensor inputs and all CAN messages that relate to ABS and stability control, then directly controls the solenoid valves and the hydraulic pump motor in the HCU.

The ABS module can be serviced separately from the HCU. When a new ABS module is installed, it must be programmed with the vehicle configuration information and programmed with the latest level of module software. These procedures are carried out using a diagnostic scan tool, follow all scan tool instructions.

When an ABS or stability control system fault has been corrected or a new component has been installed, the ABS module must be calibrated. The calibration procedures are required for the brake system to operate correctly and for the stability control sensors to learn the zero-position of the vehicle. The calibration procedures require the vehicle to be on a level surface and not moving.