INSPECTION PROCEDURE A-3: Door(s) or a tailgate cannot be locked or unlocked by central door locking system.




COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES



  • Malfunction of the door lock actuator
  • Malfunction of the tailgate lock actuator
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. Confirmation of the defective door lock actuator or tailgate lock actuator.


Q. Which doors or tailgate is not locked normally?













STEP 2. Front door lock actuator (LH) check



Q. Is the check result normal?





STEP 3. Check of short to power supply, short to earth, and open circuit in DUN, DLK1&DLK2 line between ETACS-ECU connector and front door lock actuator (LH) connector.


Q. Is the check result normal?





STEP 4. Front door lock actuator (RH) check



Q. Is the check result normal?





STEP 5. Check of short to power supply, short to earth, and open circuit in DUL2, DLK1&DLK2 line between ETACS-ECU connector and front door lock actuator (RH) connector.


Q. Is the check result normal?





STEP 6. Rear door lock actuator (LH) check



Q. Is the check result normal?





STEP 7. Check of short to power supply, short to earth, and open circuit in DUL3&DUL4, DLK3&DLK4 line between ETACS-ECU connector and rear door lock actuator (LH) connector.


Q. Is the check result normal?





STEP 8. Rear door lock actuator (RH) check



Q. Is the check result normal?





STEP 9. Check of short to power supply, short to earth, and open circuit in DUL3&DUL4, DLK3&DLK4 line between ETACS-ECU connector and rear door lock actuator (RH) connector.


Q. Is the check result normal?





STEP 10. Tailgate lock actuator check.



Q. Is the check result normal?





STEP 11. Resistance measurement at tailgate lock actuator connector (earth line terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the tailgate lock actuator connector (earth line terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 12. Check of open circuit in earth line between tailgate lock actuator connector and body earth.


Q. Is the check result normal?





STEP 13. Check of open circuit in GLK line between ETACS-ECU connector and tailgate lock actuator connector.


Q. Is the check result normal?