Inspection Procedure C-2

Central Door Locking System: Some Doors do not Lock or Unlock

Central Door Lock Circuit:

Connectors:

CIRCUIT OPERATION
- The ETACS-ECU operates the central door lock system according to the following signals:
- Driver's door lock actuator switch
- Driver's or passenger's door lock key cylinder switch
- Door lock switch, which is incorporated in the power window main switch or power window sub switch (front RH)
- The ETACS-ECU locks or unlocks all the doors by operating the central door lock relay (incorporated in the ECU) in response to input signals.

TECHNICAL DESCRIPTION (COMMENT)
The wiring harness between the door lock actuator or the ETACS-ECU and the door lock actuator may defective.

TROUBLESHOOTING HINTS
- Malfunction of the driver's door lock actuator, front passenger's door lock actuator or rear door lock actuator
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check which door lock is defective.

Q: Which of the door locks is defective?
Driver's door : Go to Step 2.
Front passenger's door : Go to Step 5.
Rear door (LH): Go to Step 8.
Rear door (RH): Go to Step 11.







STEP 2. Check the driver's door lock actuator.
Remove the driver's door lock actuator, and check it. Refer to Door Handle and Latch.

Q: Does the driver's door lock actuator work normally?

YES: Go to Step 3.

NO: Replace the driver's door lock actuator. Check that all the doors can be locked and unlocked normally.







STEP 3. Check ETACS-ECU connectors C-226, C-227 and driver's door lock actuator connector E-04 for damage.

Q: Are ETACS-ECU connectors C-226, C-227 and driver's door lock actuator connector E-04 in good condition?

YES: Go to Step 4.

NO: Repair or check the connector. Refer to Harness Connector Inspection. Check that all the doors can be locked and unlocked normally.













STEP 4. Check the wiring harness from ETACS-ECU connectors C-226 and C-227 to driver's door lock actuator connector E-04.

NOTE: Also check junction block connector C-214 and intermediate connector C-17. If junction block connector C-214 or intermediate connector C-17 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness from ETACS-ECU connectors C-226 and C-227 to driver's door lock actuator connector E-04 in good condition?

YES: Replace the ETACS-ECU. Check that all the doors can be locked and unlocked normally.

NO: Repair the wiring harness. Check that all the doors can be locked and unlocked normally.







STEP 5. Check the front passenger's door lock actuator.
Remove the passenger's door lock actuator, and check it.

Refer to Door Handle and Latch.

Q: Is the front passenger's seat door lock actuator normal?

YES: Go to Step 6.

NO: Replace the front passenger's seat door lock actuator.
Check that all the doors can be locked and unlocked normally.







STEP 6. Check ETACS-ECU connector C-226 and front passenger's door lock actuator connector E-15 for damage.

Q: Are ETACS-ECU connector C-226 and passenger's seat door lock actuator connector E-15 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that all the doors can be locked and unlocked normally.













STEP 7. Check the wiring harness from ETACS-ECU connector C-226 to front passenger's door lock actuator connector E-15.

NOTE: Also check junction block connector C-214 and intermediate connector C-110. If junction block connector C-214 or intermediate connector C-110 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness from ETACS-ECU connector C-226 to front passenger's door lock actuator connector E-15 in good condition?

YES: Replace the ETACS-ECU. Check that all the doors can be locked and unlocked normally.

NO: Repair the wiring harness. Check that all the doors can be locked and unlocked normally.







STEP 8. Check the rear door lock actuator (LH).

Remove the rear door lock actuator (LH), and check it. Refer to Door Handle and Latch.

Q: Does the rear door lock actuator (LH) work normally?

YES: Go to Step 9.

NO: Replace the rear door lock actuator (LH). Check that all the doors can be locked and unlocked normally.







STEP 9. Check ETACS-ECU connector C-226 and rear door lock actuator (LH) connector E-07 for damage.

Q: Are ETACS-ECU connector C-226 and rear door lock actuator (LH) connector E-07 in good condition?

YES: Go to Step 10.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that all the doors can be locked and unlocked normally.













STEP 10. Check the wiring harness from ETACS-ECU connector C-226 to rear door lock actuator (LH) connector E-07.

NOTE: Also check junction block connector C-217 and intermediate connector 0-15. If junction block connector C-217 or intermediate connector D-15 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-226 and rear door lock actuator (LH) connector E-07 in good condition?

YES: Replace the ETACS-ECU. Check that all the doors can be locked and unlocked normally.

NO: Replace the wiring harness. Check that all the doors can be locked and unlocked normally.







STEP 11. Check the rear door lock actuator (RH).

Remove the rear door lock actuator (RH), and check it. Refer to Door Handle and Latch.

Q: Does the rear door lock actuator (RH) work normally?

YES: Go to Step 12.

NO: Replace the rear door lock actuator (RH). Check that all the doors can be locked and unlocked normally.







STEP 12. Check ETACS-ECU connector C-226 and rear door lock actuator (RH) connector E-18 for damage.

Q: Are ETACS-ECU connector C-226 and rear door lock actuator (RH) connector E-18 in good condition?

YES: Go to Step 13.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that all the doors can be locked and unlocked normally.
















STEP 13. Check the wiring harness from ETACS-ECU connector C-226 to rear door lock actuator (RH) connector E-18.

NOTE: Also check junction block connector C-214 and intermediate connectors C-113 and D-04. If junction block connector C-214, intermediate connector C-113 or D-04 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-226 and rear door lock actuator (RH) connector E-18 in good condition?

YES: Replace the ETACS-ECU. Check that all the doors can be locked and unlocked normally.

NO: Repair the wiring harness. Check that all the doors can be locked and unlocked normally.