Diagnostic Test

ABS VERIFICATION TEST 

1. Turn the ignition off.
2. Connect all previously disconnected components and connectors.
3. Verify all accessories are turned off and the battery is fully charged.
   NOTE:

   If the Body Control Module (BCM) PROXI is not performed, the ABS indicator will illuminate continuously.

4. The BCM PROXI Configuration Alignment routine must be performed first if any of the following components were replaced: For the Body Control Module (BCM) PROXI Configuration Alignment procedure, refer to MODULE PROXI REQUIREMENTS .
5. Perform the correct routines using the scan tool under "Miscellaneous Functions" with the wheels pointing straight ahead on level ground:

   Component	Routines
   Anti-lock Brake System (ABS) Module	ECU Substitution
   Hydraulic Control Unit (HCU)	ECU Substitution
   Integrated Control Unit (ICU)	ECU Substitution
   Wheel Speed Sensor	Wheel Speed Sensor Recognition
   Electric Park Brake (EPB) Actuator(s)	Apply/Release electric park brake
   Steering Column (Clockspring)	Steering Angle Sensor Calibration in the Electric Power Steering (EPS) Module
   Steering Gear	Steering Angle Sensor Calibration in the Electric Power Steering (EPS) Module

   NOTE:

   If any of the Wheel Speed Sensors were replaced, test drive the vehicle at a speed above 25 km/h (15 mph) for several minutes. 

   NOTE:

   After erasing ACTIVE DTCs it may be necessary for the Anti-lock Brake System (ABS) Module to go to sleep before the DTCs are cleared. If the DTC is still ACTIVE after the clear command then Turn the ignition off, disconnect the Scan Tool, close the doors and wait until all indicators on the Cluster have gone out, typically about 30 seconds. 

6. Verify that the ignition is on, with the scan tool, erase all Diagnostic Trouble Codes (DTCs) from All modules. Start the engine and allow it to run for two minutes and fully operate the system that was indicating the failure.
7. Turn the ignition off and wait five seconds. Turn the ignition on and using the scan tool, read DTCs from all modules.
8. If any ABS DTCs are present, and perform the diagnostic procedure. Refer to DIAGNOSTIC CODE INDEX .
   NOTE:

   For Sensor Signal Plausibility and Pump Motor faults, the ABS Module must verify that the failure conditions are no longer present in the current ignition cycle before it can turn off the failure lamp(s). This may require the vehicle to be driven for several minutes above 15 k/mh (9 mph). Once it has been determined that the failure condition is no longer present the lamp(s) will be turned off. 

   WARNING:

   To avoid possible serious or fatal injury, check brake capability is available before road testing.

9. If there are no DTCs present after turning ignition on, road test the vehicle for at least five minutes.
   • Slowly turn the steering wheel from stop to stop.
   • Test drive the vehicle by turning the vehicle left or right in a curving manner at a speeds between 10 and 25 km/h (6 and 15 mph).
   • Perform several anti-lock braking stops.
10. Again, with the scan tool read DTCs. If any DTCs are present, for the diagnostic procedure and troubleshoot the new or recurring DTC. Refer to DIAGNOSTIC CODE INDEX .
11. If there are no DTCs present, and the customer's concern can no longer be duplicated, the repair is complete.

    Are any DTCs present or is the original concern still present?

    Yes 

    • Repair is not complete, perform the appropriate diagnostic procedure. Refer to DIAGNOSTIC CODE INDEX .

    No 

    • Repair is complete.