INSPECTION PROCEDURE A-1: Central Door Locking System does not Work. <Not Using SWS Monitor>


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.














COMMENT ON TROUBLE SYMPTOM


If the input signals from the driver’s door lock actuator are changed, ETACS-ECU activates all the door lock actuators to lock or unlock all the doors.

POSSIBLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the power supply circuit.


When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?

Go to Step 2.

Refer to GROUP 54A, inspection procedure A-1 "Check the ETACS-ECU battery power supply circuit <Not using SWS monitor> or <Using SWS monitor>."

STEP 2. Pulse check


Check the input signal which is related to the central door locking system function.
System switch
 Check conditions
Driver’s door lock actuator switch
 When the driver’s key cylinder or inside lock knob is unlocked or locked
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?

Go to Step 3.

Refer to GROUP 54A, inspection procedure C-15 "The driver’s door lock actuator signal is not received <LH drive vehicles> or <RH drive vehicles>."

STEP 3. Connector check: D-419 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Check the wiring harness between D-419 ETACS-ECU connector terminal No.2 and fusible link (2).


note Prior to the wiring harness inspection, check intermediate connector D-240 and junction block connector D-404, and repair if necessary.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

STEP 5. Retest the system.


Check that the central door locking system works normally.

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 ).

Replace the ETACS-ECU.