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. Refer to: Module Configuration - System Operation and Component Description .

When an ABS or stability control system fault has been corrected or a new component has been installed, the Interactive Vehicle Dynamics (IVD) Initialization procedure must be carried out using a diagnostic scan tool. The procedure is required for the stability control sensors to learn the zero-position of the vehicle and requires the vehicle to be on a level surface and not moving.

The ABS module controls the EPB system. When a new ABS module has been installed the EPB Apply and Release routine must be carried out using a diagnostic scan tool. This routine allows the new ABS module to initialize and calibrate the parking brakes.