Part 1

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

Taillights, Position Lights And License Plate Lights Circuit:

Connectors:

TECHNICAL DESCRIPTION (COMMENT)
If the position lights, the tail 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 license plate light bulb
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set

STEP 1. Check the operation of each light

Q: Which light does not illuminate?
tail lights (LH) and license plate light: Go to Step 2.
position light (RH) and tail lights (RH): Go to Step 4.
position light (LH): Go to Step 6.
position light (RH): Go to Step 12.
tail light (LH): Go to Step 18.
tail light (RH): Go to Step 24.
license plate lights : Go to Step 30.
license plate light (LH): Go to Step 35.
license plate light (RH): Go to Step 41.
All lights : Refer to Inspection PROCEDURE I-1 "Tail lights do not illuminate."







STEP 2. Check tail light (LH) connector F-14 and front-ECU connector A-10X for damage.

Q: Are tail light (LH) connector F-14 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 tail light (LH) and the license plate lights should illuminate normally.













STEP 3. Check the wiring harness between tail light (LH) connector F-14 and front-ECU connector A-10X.

NOTE: Also check junction block connectors C-210, C-217 and intermediate connector C-129. If junction block connectors C-210, C-217 or intermediate connector C-129 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between tail light (LH) connector F-14 and front-ECU connector A-10X in good condition?

YES: No action to be taken.

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







STEP 4. Check position light (RH) connector A-24 and front-ECU connector A-10X for damage.

Q: Are position light (RH) connector A-24 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) and the tail light (RH) should illuminate normally.
















STEP 5. Check the wiring harness between position light (RH) connector A-24 and front-ECU connector A-10X.

NOTE: Also check joint connector C-05 and intermediate connectors C-111 and C-129. If joint connector C-05, intermediate connector C-111 or C-129 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between position light (RH) connector A-24 and front-ECU connector A-10X in good condition?

YES: No action to be taken.

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

STEP 6. 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 7.

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




STEP 7. Measure at position light (LH) connector A-14 in order to check the ground circuit to the position light (LH).

1. Disconnect position light (LH) connector A-14, and measure at the wiring harness side.
2. Measure the resistance value between terminal 1 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 10.

NO: Go to Step 8.




STEP 8. Check position light (LH) connector A-14 for damage.

Q: Is position light (LH) connector A-14 in good condition?

YES: Go to Step 9.

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




STEP 9. Check the wiring harness between position light (LH) connector A-14 and ground.

Q: Is the wiring harness between position light (LH) connector A-14 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 10. Check position light (LH) connector A-14 and front-ECU connector A-10X for damage.

Q: Are position light (LH) connector A-14 and front-ECU connector A-10X in good condition?

YES: Go to Step 11.

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







STEP 11. Check the wiring harness between position light (LH) connector A-14 and front-ECU connector A-10X.

Q: Is the wiring harness between position light (LH) connector A-14 and front-ECU connector A-10X in good condition?

YES: No action to be taken.

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

STEP 12. 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 13.

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




STEP 13. Measure at position light (RH) connector A-24 in order to check the ground circuit to the position light (RH).

1. Disconnect position light (RH) connector A-24, and measure at the wiring harness side.
2. Measure the resistance value between terminal 1 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 position light (RH) connector A-24 for damage.

Q: Is position light (RH) connector A-24 in good condition?

YES: Go to Step 15.

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




STEP 15. Check the wiring harness between position light (RH) connector A-24 and ground.

Q: Is the wiring harness between position light (RH) connector A-24 and ground in good condition?

YES: Replace the position 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 16. Check position light (RH) connector A-24 and front-ECU connector A-10X for damage.

Q: Are position light (RH) connector A-24 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. Check that the position light (RH) illuminates normally.
















STEP 17. Check the wiring harness between position light (RH) connector A-24 and front-ECU connector A-10X.

NOTE: Also check joint connector C-05 and intermediate connectors C-111 and C-129. If joint connector C-05, intermediate connector C-111 or C-129 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between position light (RH) connector A-24 and front-ECU connector A-10X in good condition?

YES: No action to be taken.

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

STEP 18. 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 19.

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




STEP 19. Measure at rear combination light (LH) connector F-14 in order to check the ground circuit to the rear combination light (LH).

1. Disconnect rear combination light (LH) connector F-14, 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 22.

NO: Go to Step 20.




STEP 20. Check rear combination light (LH) connector F-14 for damage.

Q: Is rear combination light (LH) connector F-14 in good condition?

YES: Go to Step 21.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the tail lights (LH) illuminate normally.