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 HS-CAN messages relating to ABS and stability control, then directly controls the solenoid valves and the hydraulic pump motor in the HCU.

The ABS module and HCU are connected together but are serviced separately. When a new ABS is installed, the module must be programmed with the vehicle information. Refer to: Communications Network - System Operation and Component Description .

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 procedure is required for the stability control sensors to learn the zero-position of the vehicle which means the vehicle must be on a level surface and not moving. The calibration procedure (IVD Initialization Routine) is carried out using a scan tool.