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.

OPERATION



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the 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

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check that ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?
Refer to GROUP 54A - Diagnosis Code Chart .
Go to Step 2.

STEP 2. M.U.T.-III 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
270
 Dr door lock switch
 Not lock→Lock
271
 Dr door unlock switch
 Unlock→Not unlock

  • Door lock switch: Lock → Unlock.
Item No.
 Item name
 Normal condition
270
 Dr door lock switch
 Lock→Not lock
271
 Dr door unlock switch
 Not unlock→ Unlock
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54A - Trouble Symptom Chart for Input Signal .

STEP 3. Connector check: C-408 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-408 ETACS-ECU connector terminal No. 2 and fusible link (42) <4N1> or (37) <4A9, 4B1>.

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

Q. Is the check result normal?
YES : Go to Step 5.
Repair the wiring harness.

STEP 5. Connector check: C-411, C-415 ETACS-ECU connector and F-13 power window main switch connector

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Central door lock switch check
Check that the central door lock switch is in good condition. Refer to Central Door Lock Switch Check .

Q. Is the check result normal?
Go to Step 7.
Replace the power window main switch.

STEP 7. Check of the wiring harness between F-13 power window main switch connector terminal No. 10 <LH drive vehicles>, No. 9 <RH drive vehicles> and body earth.



  • Check the earth wire for open circuit.
note Prior to the wiring harness inspection, check the C-224 <LH drive vehicles>, C-211 <RH drive vehicles> intermediate connector and repair if necessary.

Q. Is the check result normal?
YES : Go to Step 8.
Repair the wiring harness.

STEP 8. Check of the wiring harness between the C-411 ETACS-ECU connector terminal No. 2 and the F-13 power window main switch connector terminal No. 14, the C-415 ETACS-ECU connector terminal No. 15 and the F-13 power window main switch connector terminal No. 13
note Prior to the wiring harness inspection, check the C-225 <LH drive vehicles>, C-212 <RH drive vehicles> intermediate connector and repair if necessary.

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

Q. Is the check result normal?
YES : Go to Step 9.
Repair the wiring harness.

STEP 9. Retest the system.
Check that the central door locking system works normally.

Q. Is the check result normal?
YES : No action is necessary and testing is complete.
Replace ETACS-ECU.