Anti-Lock Brake System (ABS) Module

The ABS  module is attached directly to the HCU  and is the electronic control unit for all of the ABS  and stability control systems. The ABS  module monitors all sensor inputs and all High Speed Controller Area Network (HS-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 and HCU  are serviced as an assembly. When a new ABS  and HCU  assembly is installed, they must be programmed with the vehicle configuration information.

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 ABS  module must be calibrated. The calibration procedures are required for the brake system to operate correctly. stability control sensors to learn the zero-position of the vehicle which means the vehicle must be on a level surface and not moving.

There are 4 calibration routines that must be performed:

• Interactive Vehicle Dynamics (IVD) Initialization
• Regenerative Brake System Calibration
• Inlet Valve Calibration
• Master Cylinder Isolation Calibration

All 4 routines are carried out using a diagnostic scan tool, make sure to follow all diagnostic scan tool directions.