Inspection Procedure C-2

Central Door Locking System: Some doors do not lock or unlock.

Central Door Lock Circuit Part 1:

Central Door Lock Circuit Part 2:

Central Door Lock Circuit Part 3:

CIRCUIT OPERATION
- The ETACS-ECU operates the central door lock system according to the following signals:
- Front door lock actuator switch
- Door lock key cylinder switch
- Door lock switch, which is incorporated in the power window main switch or front power window sub switch
- 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 be defective.

TROUBLESHOOTING HINTS
- The front door lock actuator or rear door lock actuator may be defective.
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Verify 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 6.
Rear door (LH): Go to Step 10.
Rear door (RH): Go to Step 14.




STEP 2. Check door lock actuator (front: LH) connector E-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is door lock actuator (front: LH) connector E-04 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.

STEP 3. Check the door lock actuator (front: LH).




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




2. Follow the table to check the door lock actuator (front: LH) for correct operation.

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

YES: Go to Step 4.

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




STEP 4. Check ETACS-ECU connectors C-226 and C-227 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are ETACS-ECU connectors C-226 and C-227 in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.













STEP 5. Check the wiring harness from ETACS-ECU connectors C-226 (terminal 12), C-227 (terminal 22) and door lock actuator (front: LH) connector E-04 (terminal 4 and 6).

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 damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness from ETACS-ECU connectors C-226 (terminal 12), C-227 (terminal 22) and door lock actuator (front: LH) connector E-04 (terminal 4 and 6) in good condition?

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

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that all the doors can be locked and unlocked normally.




STEP 6. Check door lock actuator (front: RH) connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is door lock actuator (front: RH) connector E-15 in good condition?

YES: Go to Step 7.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.

STEP 7. Check the door lock actuator (front: RH).




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




2. Follow the table to check the door lock actuator (front: RH) for correct operation.

Q: Is the door lock actuator (front: RH) normal?

YES: Go to Step 8.

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




STEP 8. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 9.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.













STEP 9. Check the wiring harness from ETACS-ECU connector C-226 (terminal 12 and 13) and door lock actuator (front: RH) connector E-15 (terminal 4 and 6).

NOTE: Also check junction block connector C-214 and intermediate connector C-110 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-214 or intermediate connector C-110 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness from ETACS-ECU connector C-226 (terminal 12 and 13) and door lock actuator (front: RH) connector E-15 (terminal 4 and 6) in good condition?

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

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that all the doors can be locked and unlocked normally.




STEP 10. Check door lock actuator (rear: LH) connector E-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is door lock actuator (rear: LH) connector E-07 in good condition?

YES: Go to Step 11.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.

STEP 11. Check the door lock actuator (rear: LH).




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




2. Follow the table to check the door lock actuator (rear: LH) for correct operation.

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

YES: Go to Step 12.

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




STEP 12. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 13.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.













STEP 13. Check the wiring harness from ETACS-ECU connector C-226 (terminal 12 and 13) and door lock actuator (rear: LH) connector E-07 (terminal 4 and 6).

NOTE: Also check junction block connector C-217 and intermediate connector D-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-217 or intermediate connector D-15 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-226 (terminal 12 and 13) and door lock actuator (rear: LH) connector E-07 (terminal 4 and 6) in good condition?

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

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that all the doors can be locked and unlocked normally.




STEP 14. Check door lock actuator (rear: RH) connector E-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is door lock actuator (rear: RH) connector E-18 in good condition?

YES: Go to Step 15.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.

STEP 15. Check the door lock actuator (rear: RH).




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




2. Follow the table to check the door lock actuator (rear: RH) for correct operation.

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

YES: Go to Step 16.

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




STEP 16. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 17.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that all the doors can be locked and unlocked normally.
















STEP 17. Check the wiring harness from ETACS-ECU connector C-226 (terminal 12 and 13) and door lock actuator (rear: RH) connector E-18 (terminal 4 and 6).

NOTE: Also check junction block connector C-214, intermediate connectors C-112 and D-04 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-214, intermediate connector C-112 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 (terminal 12 and 13) and door lock actuator (rear: RH) connector E-18 (terminal 4 and 6) in good condition?

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

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that all the doors can be locked and unlocked normally.