[Previous][Next]
INSPECTION PROCEDURE A-4: Central door locking system does not operate even when door lock switch of power window sub switch operated.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground 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 door lock relay, door unlock relay, driver's door unlock relay and liftgate unlock relay (built in the ETACS-ECU). The ETACS-ECU uses input signals from the door lock switch, which is incorporated in the power window sub 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 sub switch) or ETACS-ECU is suspected.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the door lock switch (built in the power window sub switch)
  • Malfunction of ETACS-ECU
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
STEP 1. Central door locking system operation check.
Check that the central door locking system works normally.
Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure A-1 "Central door locking system does not work at all ."
 
STEP 2. Door lock switch check (built in the power window sub switch).
Check that the door lock switch works normally (Refer to ).
Is the check result normal?
Go to Step 3.
Replace the power window sub switch.
 
STEP 3. Check of short to power supply, short to ground, and open circuit in D-LS, D-US line between ETACS-ECU connector and power window sub switch connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check of open circuit in ground line between power window main switch connector and body ground.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Retest the system.
Check that the central door locking system works normally.
Is the check result normal?
: No action is necessary and testing is complete.
Replace ETACS-ECU.