Inspection procedure C-1: central door locking system does not work.


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


COMMENT ON TROUBLE SYMPTOM
If the central door locking system does not work at all, the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the central door lock operation with door lock switch
Use the door lock switch to check that the central door locking system works normally.

Q. Is the check result normal?
Go to Step 2 .
Refer to Inspection Procedure C-3 "The central door lock switch (incorporated with the power window main switch) fails to perform central door locking operation ."

Step 2. 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 3.
Refer to Inspection Procedure A-2 "When the ignition switch is at the LOCK (OFF) position, the functions do not work normally. Check the battery power supply circuit to the ETACS-ECU ."

Step 3. Connector check: C-219 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. Check the wiring harness between C-219 ETACS-ECU connector terminal No.2 and fusible link (30).



note Prior to the wiring harness inspection, check intermediate connector C-125 and junction block connector C-204, and repair if necessary.

  • Check the power supply line for open or short circuit.

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 Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.