INSPECTION PROCEDURE A-2: Central door locking system does not operate even when door lock switch of power window main switch operated.


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

OPERATION


The ETACS-ECU controls the central door locking system, locking or unlocking all the doors by activating the central door lock relay (built in the ETACS-ECU). The ETACS-ECU uses input signals from the door lock switch, which is incorporated in the power window main switch.

COMMENTS ON TROUBLE SYMPTOM


If the central door locking system does not work at all, a malfunction of the door lock switch (built in the power window main switch) or ETACS-ECU is suspected.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. Central door locking system operation check.
Check that the central door locking system works normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "Central door locking system does not work at all ."

STEP 2. Central door lock switch check (built in the power window main switch).
Check that the central door lock switch works normally (Refer to Central Door Lock Switch Check ).

Q. Is the check result normal?
Go to Step 3.
Replace the power window main switch.

STEP 3. Check of short to power supply, short to earth, and open circuit in D-LS, D-US line between ETACS-ECU connector and power window main switch connector.

Q. Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. Retest the system.
Check that the central door locking system works normally.

Q. Is the check result normal?
YES : No action is necessary and testing is complete.
Replace ETACS-ECU.