Anti-Lock Brake System (ABS) Module

NOTE: On vehicles with an overlapping build date, the ABS module may be serviced separately from the HCU . Before diagnosing or installing new components on vehicles with an overlapping build date, determine the level of serviceability for the ABS you are working on.

If the ABS cannot be serviced separately from the HCU ,

Refer to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL - VEHICLES BUILT UP TO: 11-JULY-2013 .

If it can, continue on with this procedure.

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 Electric Vehicle (EV) 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 can be serviced separately from the HCU . When a new ABS is installed, it 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 the scan tool, make sure to follow all scan tool directions .