Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- CHECK FOR AN ACTIVE DTC
- Perform any Service Bulletins that may apply.
- Turn the ignition on.
- With the scan tool, read DTCs and record on the repair order.
- With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
- With the scan tool, erase ABS DTCs.WARNING:
To avoid possible serious or fatal injury, check brake capability is available before road testing.
- Test drive the vehicle straight with speeds above 15 km/h (9 mph).
- Park the vehicle on level ground.
- With the scan tool, read ABS DTCs.
Did the DTC return?
Yes
- Go To Next Step.
No
- Perform the ABS-INTERMITTENT CONDITION TEST. Refer to BSCM INTERMITTENT CONDITION .
- CHECK FOR OCCUPANT RESTRAINT CONTROLLER (ORC) DTCs
- Refer to the recorded DTCs.
Are there any ORC related DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to DIAGNOSTIC CODE INDEX .
No
- Go To Next Step.
- Refer to the recorded DTCs.
- PERFORM THE ABSO INITIALIZATION ROUTINE NOTE:
The ABS Initialization must be performed on a level surface with the wheels pointing straight.
- With the scan tool, under "Miscellaneous Functions" perform the ABSO Initialization routine.
- With the scan tool, erase ABS DTCs.
- Cycle the ignition from off to on.
- With the scan tool, read ABS DTCs.
Does the DTC remain active?
Yes
- Perform the ABSO Initialization routine again, if still unsuccessful.
- Go To Next Step.
No
- Test complete.
- Perform the ABS VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
- LONGITUDINAL AND LATERAL ACCELERATION
- On a flat surface with the scan tool, monitor the Longitudinal and Lateral Acceleration.
Is the Longitudinal and Lateral Acceleration outside of ±2.25 meters/sec^2 ?
Yes
- Go To Next Step.
No
- Go To 6
- On a flat surface with the scan tool, monitor the Longitudinal and Lateral Acceleration.
- CHECK THE ORC INSTALLATION NOTE:
The Occupant Restraint Controller (ORC) installation and mounting bolt torque is crucial for proper operation.
- Check the ORC for damaged, modified, and bent mounting brackets.
- Check the ORC mounting bolts for a loose or over tightened condition.
Were any problems found?
Yes
- Repair as necessary.
- Perform the ABS VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
No
- Go To Next Step.
- CHECK RELATED HARNESS CONNECTIONS
- Turn the ignition off.
- Disconnect the ORC harness connector.
- Disconnect all related in-line harness connections (if equipped).
- Disconnect the related component harness connectors.
- Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
- Proper connector installation.
- Damaged connector locks.
- Corrosion.
- Other signs of water intrusion.
- Weather seal damage (if equipped).
- Bent terminals.
- Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
- Terminals that have been pushed back into the connector cavity.
- Perform a terminal drag test on each connector terminal to verify proper terminal tension.
Repair any conditions that are found.
- Connect the ORC harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
- Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
- Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
- With the scan tool, erase DTCs.WARNING:
To avoid possible serious or fatal injury, check brake capability is available before road testing.
- Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read ORC DTCs.
Did the DTC return?
Yes
- Replace the Occupant Restraint Controller (ORC) in accordance with the Service Information. Refer to CONTROLLER, OCCUPANT RESTRAINT (ORC), REMOVAL AND INSTALLATION .
- Perform ABS VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
No
- The wiring or poor connection problem has been repaired.
- Perform ABS VERIFICATION TEST. Refer to BSCM INTERMITTENT CONDITION .
- CHECK RELATED HARNESS CONNECTIONS
- Turn the ignition off.
- Disconnect the ABS Module harness connector.
- Disconnect all related in-line harness connections (if equipped).
- Disconnect the related component harness connectors.
- Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
- Proper connector installation.
- Damaged connector locks.
- Corrosion.
- Other signs of water intrusion.
- Weather seal damage (if equipped).
- Bent terminals.
- Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
- Terminals that have been pushed back into the connector cavity.
- Perform a terminal drag test on each connector terminal to verify proper terminal tension.
Repair any conditions that are found.
- Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
- Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
- Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
- With the scan tool, erase DTCs.WARNING:
To avoid possible serious or fatal injury, check brake capability is available before road testing.
- Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read ABS Module DTCs.
Did the DTC return?
Yes
- Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, BRAKE SYSTEM CONTROL (BSCM), REMOVAL AND INSTALLATION .
- Perform ABS VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
No
- The wiring or poor connection problem has been repaired.
- Perform ABS VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.