Anti-Lock Brake System (ABS) Module

The ABS module is attached directly to the HCU and is the ECU for all of the vehicle dynamic systems. The module monitors all sensor inputs and all HS-CAN  messages that relate to vehicle dynamics and then directly controls the solenoid valves and the hydraulic pump motor.

On vehicles equipped with adaptive cruise control, the ABS module and HCU are serviced as an assembly. When a new ABS module is installed, whether with a new HCU or not, the module must be programmed with the vehicle information. For additional information on module programming, REFER to PROGRAMMABLE MODULE INSTALLATION (PMI) .

When a vehicle dynamic system fault has been corrected or a component has been replaced, the ABS module requires calibration. 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 must not be moving. The calibration procedure is carried out using a scan tool.