42 -BODY > 42A-BODY > DOOR > SYMPTOM PROCEDURES<CENTRAL DOOR LOCKING SYSTEM><CENTRAL DOOR LOCKING SYSTEM> > CENTRAL DOOR LOCKING SYSTEM DOES NOT OPERATE
Inspection Procedure A-1: Central door locking system does not work at all.
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), front door lock actuator (driver’s side) or ETACS-ECU is suspected.
PROBABLE CAUSES
Malfunction of the central door lock switch (built in the power window main switch)
Malfunction of the front door lock actuator (driver’s side)
Malfunction of ETACS-ECU
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE diagnosis code
Check that ETACS-ECU sets a diagnosis code.
Is the diagnosis code set?
Refer to GROUP 54A, ETACS - Diagnosis Code Chart .
Go to Step 2.
STEP 2. M.U.T.-IIISE data list
Check the ETACS-ECU service items related to the central door locking system operation.
Door lock switch: Unlock → Lock.
Item No.
Item name
Normal condition
94
Driver's door unlock switch
Unlock→Not unlock
Door lock switch: Lock → Unlock.
Item No.
Item name
Normal condition
94
Driver's door unlock switch
Not unlock→Unlock
Central door lock switch (built in power window main switch)
Item No.
Item name
Normal condition
100
Central door lock switch
OFF to ON (Only when switch is operated)
101
Central door unlock switch
OFF to ON (Only when switch is operated)
OK: Normal conditions are displayed for all the items.
Are the check result normal?
YES <Normal conditions are displayed for all the items.> : Go to Step 3.
NO <Normal condition is not displayed for item No. 94> : Refer to GROUP 54A, ETACS - Inspection Procedure 4: The front door lock actuator (driver’s side) signal is not received .
NO <Normal condition is not displayed for item No. 100 or 101> : Refer to GROUP 54A, ETACS - Inspection Procedure 21: The door lock switch (incorporated with the power window main switch) signal is not received .
STEP 3. Check of short to power supply, short to earth, and open circuit in +B2 line between ETACS-ECU connector and fusible link.
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.
Is the check result normal?
YES : No action is necessary and testing is complete.
Refer to GROUP 54A, ETACS - Diagnosis Code Chart 
.
Go to Step 2.