Code No.B1707: Detection of Turn-signal Lamp (open circuit)




COMMENTS ON TROUBLE SYMPTOM


When the turn-signal lamp bulb is blown, or connector(s) or wiring harness between the ETACS-ECU, the turn-signal lamp which does not illuminate and body earth is defective, the ETACS-ECU set diagnosis code No.B1707.

PROBABLE CAUSES



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 9.
Rear turn-signal lamp : Go to Step 16.

STEP 2. Connector check: A-118 front turn-signal lamp (LH) connector or A-127 front turn-signal lamp (RH) connector.


Q. Is the check result normal?

Go to Step 3.

Repair the defective connector. Go to Step 23.

STEP 3. Check the bulb(s) of the front 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. Go to Step 23.

STEP 4. Resistance measurement at the A-118 front turn-signal lamp (LH) connector or A-127 front turn-signal lamp (RH) connector.


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

(2)Resistance measurement between the defective lamp connector terminal and body earth.

  • Resistance between A-118 front turn-signal lamp (LH) connector terminal No.1 and body earth
  • Resistance between A-127 front turn-signal lamp (RH) connector terminal No.1 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness from A-118 front turn-signal lamp (LH) connector terminal No.1 or A-127 front turn-sinal lamp (RH) connector terminal No.1 to 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Go to Step 23.

Repair the wiring harness. Go to Step 23.

STEP 6. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 7.

Repair the defective connector. Go to Step 23.

STEP 7. Check the wiring harness from the A-118 front turn-signal lamp (LH) connector terminal No.2 or A-127 front turn-signal lamp (RH) connector terminal No.2 to C-218 ETACS-ECU connector terminal No.3 or No.4.





note Prior to the wiring harness inspection, check 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 8.

Repair the wiring harness. Go to Step 23.

STEP 8. 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Go to Step 23.
Replace the front turn-signal lamp. Go to Step 23.

STEP 9. Connector check: A-114 side turn-signal lamp (LH) connector or A-101 side turn-signal lamp (RH) connector.


Q. Is the check result normal?

Go to Step 10.

Repair the defective connector. Go to Step 23.

STEP 10. Check the bulb(s) of side turn-signal lamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 11.
Replace the bulb(s) of the defective lamp. Go to Step 23.

STEP 11. Resistance measurement at the A-114 side turn-signal lamp (LH) connector or A-101 side turn-signal lamp (RH) connector.


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

(2)Resistance measurement between the defective lamp connector terminal and body earth.

  • Resistance between A-114 side turn-signal lamp (LH) connector terminal No.1 and body earth
  • Resistance between A-101 side turn-signal lamp (RH) connector terminal No.1 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 13.

Go to Step 12.

STEP 12. Check the wiring harness from A-114 side turn-signal lamp (LH) connector terminal No.1 or A-101 side turn-signal lamp (RH) 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the wiring harness. Go to Step 23.

STEP 13. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 14.

Repair the defective connector. Go to Step 23.

STEP 14. Check the wiring harness from the A-114 side turn-signal lamp (LH) connector terminal No.2 or A-101 side turn-signal lamp (RH) connector terminal No.2 to C-218 ETACS-ECU connector terminal No.3 or No.4.





note Prior to the wiring harness inspection, check 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 15.

Repair the wiring harness. Go to Step 23.

STEP 15. 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Go to Step 23.
Replace the side turn-signal lamp. Go to Step 23.

STEP 16. Connector check: F-04 rear combination lamp (turn: LH) or F-02 rear combination lamp (turn: RH).

Q. Is the check result normal?

Go to Step 17.

Repair the defective connector. Go to Step 23.

STEP 17. Check the bulb(s) of rear turn-signal lamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 18.
Replace the bulb(s) of the defective lamp. Go to Step 23.

STEP 18. Resistance measurement at the F-04 rear combination lamp (turn: LH) connector or F-02 rear combination lamp (turn: RH) connector.

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

(2)Resistance measurement between the defective lamp connector terminal and body earth.

  • Resistance between F-04 rear combination lamp (turn: LH) connector terminal No.5 and body earth
  • Resistance between F-02 rear combination lamp (turn: RH) connector terminal No.5 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 20.

Go to Step 19.

STEP 19. Check the wiring harness from F-04 rear combination lamp (turn: LH) connector terminal No.5 or F-02 rear combination lamp (turn: RH) connector terminal No.5 to body earth.

note Prior to the wiring harness inspection, check intermediate connector F-07, 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Go to Step 23.

Repair the wiring harness. Go to Step 23.

STEP 20. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 21.

Repair the defective connector. Go to Step 23.

STEP 21. Check the wiring harness from the F-04 rear combination lamp (turn: LH) connector terminal No.1 or F-02 rear combination lamp (turn: RH) connector terminal No.1 to C-218 ETACS-ECU connector terminal or No.3 or No.4.





note Prior to the wiring harness inspection, check intermediate connectors C-31 <R.H. drive vehicles>, F-07 and junction block connector C-221 <L.H. drive vehicles> or C-204 <R.H. drive vehicles>, 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. Go to Step 23.

STEP 22. 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 use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Go to Step 23.
Replace the rear combination lamp. Go to Step 23.

STEP 23. Check whether the diagnosis code is reset.
Check if diagnosis code No.B1707 is set to the ETACS-ECU.

Q. Is the diagnosis code set?
Replace the ETACS-ECU.
The procedure is complete.