INSPECTION PROCEDURE 6: 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.

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 front door power window switch (main).

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 front door power window switch (main)} 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. M.U.T.-III data list.
Change the input signals from the door lock switch.
Item No.
 Item name
 Normal condition
113
 Central door lock switch
 OFF to ON (Only when switch is operated)
114
 Central door unlock switch
 OFF to ON (Only when switch is operated)
OK: Normal condition is displayed.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).
Refer to GROUP 54A - ETACS - Inspection Procedure 13 "The door lock switch signal is not received." .