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Diagnostic Test

ABS VERIFICATION TEST 

WARNING:

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

  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.
  4. The Body Control Module (BCM) PROXI Configuration Alignment routine must be performed first if any of the following components were replaced listed in the table below.
    • Turn the ignition on and using the scan tool, go into the Body Control Module (BCM) under "Miscellaneous Functions" and perform the "PROXI Configuration Alignment" routine.
    NOTE:

    If the BCM PROXI is not performed, the ABS indicator will illuminate continuously.

  5. Perform the correct routines using the scan tool under "Miscellaneous Functions" with the wheels pointing straight ahead on level ground:
    NOTE:

    If the ABS is not initialized, the ABS indicator will flash continuously.

    Component Routines
    Anti-lock Brake System (ABS) Module ABS Initialization
    Hydraulic Control Unit (HCU) ABS Initialization/ABS Bleed Brakes
    Integrated Control Unit (ICU) ABS Initialization/ABS Bleed Brakes
    Dynamics Sensor/Occupant Restraints Controller (ORC) ABS Initialization
    Steering Column Control Module (SCCM)/Steering Angle Sensor (SAS) ABS Initialization
    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.

  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 Diagnostic Trouble Codes are present, Perform the diagnostic procedure. Refer to the DTC INDEX article.
    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.

  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 lock to lock.
    • 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 the DTC INDEX article.
  11. If there are no Diagnostic Trouble Codes (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 the DTC INDEX article.

    No 

    • Repair is complete.
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