Inspection Procedure 11: One 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 one of the turn-signal lamps does not illuminate, the wiring harness connector(s) or the bulb may be defective.

PROBABLE CAUSES

  • Defective 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?
YES (All of the turn-signal lamps illuminate normally) : The procedure is complete.
NO (Only the front turn-signal lamps does not illuminate normally) : Go to Step 2.
NO (Only the side turn-signal lamps (in door mirror type) does not illuminate normally) : Go to Step 6.
NO (Only the side turn-signal lamps (fender panel attachment type) does not illuminate normally) : Go to Step 11.
NO (Only the rear turn-signal lamps does not illuminate normally) : Go to Step 15.

STEP 2. Connector check: A-44 front turn-signal lamp (RH) or A-18 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-44 front turn-signal lamp (RH) or A-18 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-44 front turn-signal lamp (RH) connector terminal No.2 and body earth
  • Resistance between A-18 front turn-signal lamp (LH) connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 19.
Go to Step 5.

STEP 5. Check the wiring harness from A-44 front turn-signal lamp (RH) connector terminal No.2 and body earth or A-18 front 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 6. Connector check: F-09-1 side turn-signal lamp (RH) or F-04-1 side turn-signal lamp (LH) connector.

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 7. Resistance measurement at the F-09-1 side turn-signal lamp (RH) or F-04-1 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-09-1 side turn-signal lamp (RH) connector terminal No.4 and body earth
  • Resistance between F-04-1 side turn-signal lamp (LH) connector terminal No.4 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 22.
Go to Step 8.

STEP 8. Connector check: F-09 door mirror assembly (RH) or F-04 door mirror assembly (LH) connector.

Q. Is the check result normal?
Go to Step 9.
Repair the defective connector.

STEP 9. Resistance measurement at the F-09 door mirror assembly (RH) or F-04 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-09 door mirror assembly (RH) connector terminal No.5 and body earth
  • Resistance between F-04 door mirror assembly (LH) connector terminal No.5 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Repair the wiring harness in the door mirror assembly.
Go to Step 10.

STEP 10. Check the wiring harness from F-09 door mirror assembly (RH) or F-04 door mirror assembly (LH) connector terminal No.5 and body earth.
note Prior to the wiring harness inspection, check intermediate connector D-114 <side turn-signal lamp (RH)>, D-133 <side turn-signal lamp (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 11. Connector check: A-02 side turn-signal lamp (RH) or A-04 side turn-signal lamp (LH) connector.

Q. Is the check result normal?
Go to Step 12.
Repair the defective connector.

STEP 12. 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 13.
Replace the bulb(s) of the defective lamp.

STEP 13. Resistance measurement at the A-02 side turn-signal lamp (RH) or A-04 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 A-02 side turn-signal lamp (RH) connector terminal No.1 and body earth
  • Resistance between A-04 front turn-signal lamp (LH) connector terminal No.1 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 25.
Go to Step 14.

STEP 14. Check the wiring harness from A-02 side turn-signal lamp (RH) connector terminal No.1 and body earth or A-04 side turn-signal lamp (LH) connector terminal No.1 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 15. Connector check: E-06 rear combination lamp (TURN: RH), E-12 rear combination lamp (TURN: LH), E-111 tail and turn lamp (TURN: RH) or E-115 tail and turn lamp (TURN: LH) connector.

Q. Is the check result normal?
Go to Step 16.
Repair the defective connector.

STEP 16. 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 17.
Replace the bulb(s) of the defective lamp.

STEP 17. Resistance measurement at the E-06 rear combination lamp (TURN: RH), E-12 rear combination lamp (TURN: LH), E-111 tail and turn lamp (TURN: RH) or E-115 tail and turn lamp (TURN: 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 E-06 rear combination lamp (TURN: RH) connector terminal No.4 and body earth <Short wheelbase>
  • Resistance between E-06 rear combination lamp (TURN: RH) connector terminal No.5 and body earth <Long wheelbase>
  • Resistance between E-12 rear combination lamp (TURN: LH) connector terminal No.4 and body earth <Short wheelbase>
  • Resistance between E-12 rear combination lamp (TURN: LH) connector terminal No.5 and body earth <Long wheelbase>
  • Resistance between E-111 tail and turn lamp (TURN: RH) connector terminal No.4 and body earth
  • Resistance between E-115 tail and turn lamp (TURN: LH) connector terminal No.4 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 28.
Go to Step 18.

STEP 18. Check the wiring harness from E-06 rear combination lamp (TURN: RH) connector terminal No.4 <Short wheelbase>, E-06 rear combination lamp (TURN: RH) connector terminal No.5 <Long wheelbase>, E-12 rear combination lamp (TURN: LH) connector terminal No.4 <Short wheelbase>, E-12 rear combination lamp (TURN: LH) connector terminal No.5 <Long wheelbase>, E-111 tail and turn lamp (TURN: RH) connector terminal No.4 or E-115 tail and turn lamp (TURN: LH) 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 19. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 20.
Repair the defective connector.

STEP 20. Check the wiring harness from the A-44 front turn-signal lamp (RH) connector terminal No.1 to D-419 ETACS-ECU connector terminal No.9 or A-18 front turn-signal lamp (LH) connector terminal No.1 to D-419 ETACS-ECU connector terminal No.14.
note Prior to the wiring harness inspection, check intermediate connector D-241, joint connector A-15 <R.H. drive vehicles>, joint connector A-14 <L.H. drive vehicles> and junction block connector D-401, and repair if necessary.

  • Check the output lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 21.
Repair the wiring harness.

STEP 21. Retest the system.
Check that the front 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 front turn-signal lamp.

STEP 22. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 23.
Repair the defective connector.

STEP 23. Check the wiring harness from the F-09-1 side turn-signal lamp (RH) connector terminal No.3 to D-419 ETACS-ECU connector terminal No.9 or F-04-1 side turn-signal lamp (LH) connector terminal No.3 to D-419 ETACS-ECU connector terminal No.14.
note Prior to the wiring harness inspection, check intermediate connector D-114 <side turn-signal lamp (RH)> or D-133 <side turn-signal lamp (LH)> and junction block connector D-401, and repair if necessary.

  • Check the output lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 24.
Repair the wiring harness.

STEP 24. 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 25. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 26.
Repair the defective connector.

STEP 26. Check the wiring harness from the A-02 side turn-signal lamp (RH) connector terminal No.2 to D-419 ETACS-ECU connector terminal No.9 or A-04 side turn-signal lamp (LH) connector terminal No.2 to D-419 ETACS-ECU connector terminal No.14.
note Prior to the wiring harness inspection, check intermediate connector D-241, joint connector A-15 <R.H. drive vehicles>, joint connector A-14 <L.H. drive vehicles> and junction block connector D-401, and repair if necessary.

  • Check the output lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 27.
Repair the wiring harness.

STEP 27. 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 28. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 29.
Repair the defective connector.

STEP 29. Check the wiring harness from the E-06 rear combination lamp (TURN: RH) connector terminal No.5 <Short wheelbase>, E-06 rear combination lamp (TURN: RH) connector terminal No.3 <Long wheelbase>, E-111 tail and turn lamp (TURN: RH) connector terminal No.1 to D-419 ETACS-ECU connector terminal No.9 or E-12 rear combination lamp (TURN: LH) connector terminal No.5 <Short wheelbase>, E-12 rear combination lamp (TURN: LH) connector terminal No.3 <Long wheelbase>, E-115 tail and turn lamp (TURN: LH) connector terminal No.1 to D-419 ETACS-ECU connector terminal or No.14.
note <L.H. drive vehicles> Prior to the wiring harness inspection, check intermediate connector D-220 <rear combination lamp (TURN: RH)>, D-237 <rear combination lamp (TURN: LH)> and junction block connector D-409 <rear combination lamp (TURN: RH)>, D-405 <rear combination lamp (TURN: LH)>, and repair if necessary.
note <R.H. drive vehicles> Prior to the wiring harness inspection, check intermediate connector E-119 <tail and turn lamp (TURN)>, D-237 <rear combination lamp (TURN: LH)> and junction block connector D-422 <rear combination lamp (TURN: RH), tail and turn lamp (TURN)>, D-401 <rear combination lamp (TURN: LH)>, and repair if necessary.

  • Check the output lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 30.
Repair the wiring harness.

STEP 30. Retest the system.
Check that the rear 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 rear turn-signal lamp assembly.