Part 1 of 2

Headlight, Tail Light: Tail Lights, the Position Lights, the Side Marker Light or the License Plate Lights do not Illuminate.

Talilights, Position Lights And License Plate Lights Circuit Part 1:

Talilights, Position Lights And License Plate Lights Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If the position lights, the tail lights, the side marker lights or the license plate lights do not illuminate, their bulb may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the position light bulb
- Malfunction of the stop/tail light bulb
- Malfunction of the side marker light bulb
- Malfunction of the license plate light bulb
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check the operation of each light.

Q: Which light does not illuminate?

position light (LH), tail lights (LH), side marker light (LH) and license plate light: Go to Step 2.

position light (RH), tail lights (RH) and side marker light (RH): Go to Step 4.

tail lights, side marker lights and license plate light: Go to Step 6.

tail lights (LH), side marker light (LH) and license plate light: Go to Step 8.

tail lights (RH) and side marker light (RH): Go to Step 10.

position light (LH): Go to Step 12.

position light (RH): Go to Step 18.

tail light (LH): Go to Step 24.

tail light (RH): Go to Step 30.

rear side marker light (LH): Go to Step 36.

rear side marker light (RH): Go to Step 42.

license plate light: Go to Step 48.

All lights: Refer to Inspection Procedure J-1 "Tail lights do not illuminate normally."







STEP 2. Check front combination light (LH) connector A-26 and front-ECU connector A-10X for damage.

Q: Are front combination light (LH) connector A-26 and front-ECU connector A-10X in good condition?

YES: Go to Step 3.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The position light (LH), the tail light (LH), the side marker light (LH) and the license plate lights should illuminate normally.













STEP 3. Check the wiring harness between front combination light (LH) connector A-26 (terminal 3) and front-ECU connector A-10X (terminal 8).

NOTE: Also check joint connector C-77 and intermediate connector C-89. If joint connector C-77 or intermediate connector C-89 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between front combination light (LH) connector A-26 (terminal 3) and front-ECU connector A-10X (terminal 8) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The position light (LH), the tail light (LH), the side marker light (LH) and the license plate lights should illuminate normally.







STEP 4. Check position light (RH) connector A-32 and front-ECU connector A-10X for damage.

Q: Are position light (RH) connector A-32 and front-ECU connector A-10X in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The position light (RH), the tail light (RH), and the side marker light (RH) should illuminate normally.













STEP 5. Check the wiring harness between position light (RH) connector A-32 (terminal 3) and front-ECU connector A-10X (terminal 8).

NOTE: Also check intermediate connectors C-06 and C-89. If intermediate connector C-06 or C-89 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between position light (RH) connector A-32 (terminal 3) and front-ECU connector A-10X (terminal 8) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The position light (RH), the tail light (RH), and the side marker light (RH) should illuminate normally.







STEP 6. Check rear combination light (LH) connector F-17 for damage.

Q: Are rear combination light (LH) connector F-17 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The tail light (LH), side marker light (LH) and the license plate lights should illuminate normally.







STEP 7. Check the wiring harness between rear combination light (LH) connector F-17 (terminal 5) and ground.

Q: Is the wiring harness between rear combination light (LH) connector F-17 (terminal 5) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The tail light (LH), side marker light (LH) and the license plate lights should illuminate normally.










STEP 8. Check rear combination light (LH) connector F-17 and front-ECU connector A-10X for damage.

Q: Are rear combination light (LH) connector F-17 and front-ECU connector A-10X in good condition?

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The tail light (LH), side marker light (LH) and the license plate lights should illuminate normally.
















STEP 9. Check the wiring harness between rear combination light (LH) connector F-17 (terminal 2) and front-ECU connector A-10X (terminal 8).

NOTE: Also check joint connector C-77 and intermediate connectors C-89 or C-90. If joint connector C-77 or intermediate connectors C-89 and C-90 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between rear combination light (LH) connector F-17 and front-ECU connector A-10X in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The tail light (LH), side marker light (LH) and the license plate lights should illuminate normally.







STEP 10. Check rear combination light (RH) connector F-09 and ground for damage.

Q: Are rear combination light (RH) connector F-09 and ground in good condition?

YES: Go to Step 11.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The tail light (RH) and the side marker light (RH) should illuminate normally.













STEP 11. Check the wiring harness between rear combination light (RH) connector F-09 (terminal 5) and ground.

NOTE: Also check junction block connectors C-101 and C-112 and intermediate connector C-89. If junction block connectors C-101 or C-112 or intermediate connector C-89 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between rear combination light (RH) connector F-09 (terminal 5) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The tail light (RH) and the side marker light (RH) should illuminate normally.

STEP 12. Check the position light bulb (LH).

1. Remove the position light bulb (LH).
2. Check that the position light bulb (LH) is not broken.

Q: Is the position light bulb (LH) in good condition?

YES: Go to Step 13.

NO: Replace the position light bulb (LH). Check that the position light (LH) illuminates normally.

STEP 13. Measure at front combination light (LH) connector A-26 in order to check the ground circuit to the position light (LH).




1. Disconnect front combination light (LH) connector A-26, and measure at the wiring harness side.




2. Measure the resistance value between terminal 2 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 16.

NO: Go to Step 14.




STEP 14. Check front combination light (LH) connector A-26 for damage.

Q: Is front combination light (LH) connector A-26 in good condition?

YES: Go to Step 15.

NO: Repair or replace the connector. Refer to Harness connector Inspection. Check that the position light (LH) illuminates normally.




STEP 15. Check the wiring harness between front combination light (LH) connector A-26 (terminal 2) and ground.

Q: Is the wiring harness between front combination light (LH) connector A-26 (terminal 2) and ground in good condition?

YES: Replace the position light socket (LH). Check that the position light (LH) illuminates normally.

NO: Repair the wiring harness. Check that the position light (LH) illuminates normally.







STEP 16. Check front combination light (LH) connector A-26 and front-ECU connector A-10X for damage.

Q: Are front combination light (LH) connector A-26 and front-ECU connector A-10X in good condition?

YES: Go to Step 17.

NO: Repair or replace the connector. Refer to Harness connector Inspection. The tail light (LH, incorporated in rear combination light) and the side marker light (LH) should illuminate normally. Check that the position light (LH) illuminates normally.













STEP 17. Check the wiring harness between front combination light (LH) connector A-26 (terminal 3) and front-ECU connector A-10X (terminal 8).

NOTE: Also check joint connector C-77 and intermediate connector C-89. If joint connector C-77 or intermediate connector C-89 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between front combination light (LH) connector A-26 (terminal 3) and front-ECU connector A-10X (terminal 8) in good condition?

YES: Replace the position light socket (LH). Check that the position light (LH) illuminates normally.

NO: Repair the wiring harness. Check that the position light (LH) illuminates normally.

STEP 18. Check the position light bulb (RH).

1. Remove the position light bulb (RH).
2. Check that the position light bulb (RH) is not broken.

Q: Is the position light bulb (RH) in good condition?

YES: Go to Step 19.

NO: Replace the position light bulb (RH). Check that the position light (RH) illuminates normally.

STEP 19. Measure at position light (RH) connector A-32 in order to check the ground circuit to the position light (RH).




1. Disconnect position light (RH) connector A-32, and measure at the wiring harness side.




2. Measure the resistance value between terminal 2 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 22.

NO: Go to Step 20.




STEP 20. Check position light (RH) connector A-32 for damage.

Q: Is position light (RH) connector A-32 in good condition?

YES: Go to Step 21.

NO: Repair or replace the connector. Refer to Harness connector Inspection. Check that the position light (RH) illuminates normally.




STEP 21. Check the wiring harness between position light (RH) connector A-32 (terminal 2) and ground.

Q: Is the wiring harness between position light (RH) connector A-32 (terminal 2) and ground in good condition?

YES: Replace the front combination light socket (RH). Check that the position light (RH) illuminates normally.

NO: Repair the wiring harness. Check that the position light (RH) illuminates normally.







STEP 22. Check position light (RH) connector A-32 and front-ECU connector A-10X for damage.

Q: Are position light (RH) connector A-32 and front-ECU connector A-10X in good condition?

YES: Go to Step 23.

NO: Repair or replace the connector. Refer to Harness connector Inspection. Check that the position light (LH) illuminates normally.













STEP 23. Check the wiring harness between position light (RH) connector A-32 (terminal 3) and front-ECU connector A-10X(terminal 8).

NOTE: Also check intermediate connectors C-06 and C-89. If intermediate connector C-06 or C-89 is damaged, repair or replace the connector as described in Harness connector Inspection.

Q: Is the wiring harness between position light (RH) connector A-32 (terminal 3) and front-ECU connector A-10X (terminal 8) in good condition?

YES: Replace the front combination light socket (RH). Check that the position light (LH) illuminates normally.

NO: Repair the wiring harness. Check that the position light (LH) illuminates normally.

STEP 24. Check the stop/tail light bulb (LH).

1. Remove the stop/tail light bulb (LH).
2. Check that the stop/tail light bulb (LH) is not broken.

Q: Is the stop/tail light bulb (LH) in good condition?

YES: Go to Step 25.

NO: Replace the stop/tail light bulb (LH). Check that the tail light (LH) illuminates normally.

STEP 25. Measure at rear combination light (LH) connector F-17 in order to check the ground circuit to the rear combination light (LH).







1. Disconnect rear combination light (LH) connector F-17, and measure at the wiring harness side.




2. Measure the resistance value between terminal 5 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 28.

NO: Go to Step 26.







STEP 26. Check rear combination light (LH) connector F-17 for damage.

Q: Is rear combination light (LH) connector F-17 in good condition?

YES: Go to Step 27.

NO: Repair or replace the connector. Refer to Harness connector Inspection. Check that the tail light (LH) illuminates normally.







STEP 27. Check the wiring harness between rear combination light (LH) connector F-17 (terminal 5) and ground.

Q: Is the wiring harness between rear combination light (LH) connector F-17 (terminal 5) and ground in good condition?

YES: Replace the rear combination light socket assembly (LH). Check that the tail lights (incorporated in rear combination lights) illuminate normally.

NO: Repair the wiring harness. Check that the tail light (LH) illuminates normally.