INSPECTION PROCEDURE M-3: Any of the turn-signal lamps does not illuminate.


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








COMMENTS ON TROUBLE SYMPTOM
If any of the turn-signal lamp does not illuminate normally, wiring harness connector(s) or the bulb may be defective.

POSSIBLE CAUSES

  • Defective front turn-signal lamp bulb
  • Defective side turn-signal lamp
  • Defective rear turn-signal lamp bulb
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Confirm which turn-signal lamp is defective.

Q. Which turn-signal lamp fails to illuminate correctly?
Front turn-signal lamp : Go to Step 2.
Side turn-signal lamp : Go to Step 7.
Rear turn-signal lamp : Go to Step 12.

Step 2. Connector check: A-33 front turn-signal lamp (RH) or A-23 front turn-signal lamp (LH) connector.




Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

Step 3. Check the bulb(s) of the turn-signal lamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 4.
Replace the bulb(s) of the defective lamp.

Step 4. Resistance measurement at the A-33 front turn-signal lamp (RH) or A-23 front turn-signal lamp (LH) connector.




(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between the defective lamp connector terminal and body earth.

  • Resistance between A-33 front turn-signal lamp (RH) connector terminal No.1 and body earth
  • Resistance between A-23 front turn-signal lamp (LH) connector terminal No.1 and body earth
OK: 2 Ω or less

Q. Is the check result normal?

Go to Step 16.

Go to Step 5.

Step 5. Connector check: A-40 earth connector <front turn-signal lamp (RH)> and A-25 earth connector <front turn-signal lamp (LH)>.




Q. Is the check result normal?

Go to Step 6.

Repair the connector.

Step 6. Check the wiring harness from A-33 front turn-signal lamp (RH) connector terminal No.1and A-40 earth connector terminal No.3 or A-23 front turn-signal lamp (LH) connector terminal No.1 and A-25 earth connector terminal No.6.





  • Check the earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

Step 7. Connector check: F-13-6 side turn-signal lamp (RH) or F-07-6 side turn-signal lamp (LH) connector.


Q. Is the check result normal?

Go to Step 8.

Repair the defective connector.

Step 8. Resistance measurement at the F-13-6 side turn-signal lamp (RH) or F-07-6 side turn-signal lamp (LH) connector.


(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between the defective lamp connector terminal and body earth.

  • Resistance between F-13-6 side turn-signal lamp (RH) connector terminal No.2 and body earth
  • Resistance between F-07-6 side turn-signal lamp (LH) connector terminal No.2 and body earth
OK: 2 Ω or less

Q. Is the check result normal?

Go to Step 19.

Go to Step 9.

Step 9. Connector check: F-13 door mirror assembly (RH) or F-07 door mirror assembly (LH) connector.




Q. Is the check result normal?

Go to Step 10.

Repair the defective connector.

Step 10. Resistance measurement at the F-13 door mirror assembly (RH) or F-07 door mirror assembly (LH) connector.




(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between the defective lamp connector terminal and body earth.

  • Resistance between F-13 door mirror assembly (RH) connector terminal No.2 and body earth
  • Resistance between F-07 door mirror assembly (LH) connector terminal No.2 and body earth
OK: 2 Ω or less

Q. Is the check result normal?

Repair the wiring harness in the door mirror assembly.

Go to Step 11.

Step 11. Check the wiring harness from F-13 door mirror assembly (RH) or F-07 door mirror assembly (LH) connector terminal No.2 and body earth.








note Prior to the wiring harness inspection, check intermediate connector C-14 <RH>, C-27 <LH>, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

Step 12. Connector check: G-09 rear turn-signal lamp (RH) or G-25 rear turn-signal lamp (LH) connector.

Q. Is the check result normal?

Go to Step 13.

Repair the defective connector.

Step 13. Check the bulb(s) of the turn-signal lamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 14.
Replace the bulb(s) of the defective lamp.

Step 14. Resistance measurement at the G-09 rear turn-signal lamp (RH) or G-25 rear turn-signal lamp (LH) connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between the defective lamp connector terminal and body earth.

  • Resistance between G-09 rear turn-signal lamp (RH) connector terminal No.2 and body earth
  • Resistance between G-25 rear turn-signal lamp (LH) connector terminal No.2 and body earth
OK: 2 Ω or less

Q. Is the check result normal?

Go to Step 23.

Go to Step 15.

Step 15. Check the wiring harness from G-09 rear turn-signal lamp (RH) or G-25 rear turn-signal lamp (LH) connector terminal No.2 and body earth.


  • Check the earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

Step 16. Connector check: C-219 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 17.

Repair the defective connector.

Step 17. Check the wiring harness from the A-33 front turn-signal lamp (RH) connector terminal No.2 to C-219 ETACS-ECU connector terminal No.9 or A-23 front turn-signal lamp (LH) connector terminal No.2 to C-219 ETACS-ECU connector terminal No.14.










note Prior to the wiring harness inspection, check intermediate connector C-125 and junction block connector C-203, and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 18.

Repair the wiring harness.

Step 18. Retest the system.
Check that the turn-signal lamps illuminate 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 headlamp assembly.

Step 19. Connector check: C-219 ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 20.

Repair the defective connector.

Step 20. Connector check: F-13 door mirror assembly (RH) or F-07 door mirror assembly (LH) connector.




Q. Is the check result normal?

Go to Step 21.

Repair the defective connector.

Step 21. Check the wiring harness from the F-13-6 side turn-signal lamp (RH) connector terminal No.1 to C-219 ETACS-ECU connector terminal No.9 or F-07-6 side turn-signal lamp (LH) connector terminal No.1 to C-219 ETACS-ECU connector terminal No.14.










note Prior to the wiring harness inspection, check intermediate connector C-14 <RH>, C-27 <LH> and junction block connector C-205, and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 22.

Repair the wiring harness.

Step 22. Retest the system.
Check that the side turn-signal lamps illuminate 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 side turn-signal lamp.

Step 23. Connector check: C-219 ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 24.

Repair the defective connector.

Step 24. Check the wiring harness from the G-09 rear turn-signal lamp (RH) connector terminal No.1 to C-219 ETACS-ECU connector terminal No.9 or G-25 rear turn-signal lamp (LH) connector terminal No.1 to C-219 ETACS-ECU connector terminal or No.14.





note Prior to the wiring harness inspection, check intermediate connector G-21 and junction block connector C-210, and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 25.

Repair the wiring harness.

Step 25. Retest the system.
Check that the turn-signal lamps.

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 rear turn-signal lamp assembly.