Inspection Procedure I-6

INSPECTION PROCEDURE I-6: Headlight and Taillight: The taillights, the front parking lights or the license plate light do not illuminate.

Taillights, Front Parking Lights And License Plate Light Circuit Part 1:

Taillights, Front Parking Lights And License Plate Light Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If the front parking lights, the taillights or the license plate light do not illuminate, their bulb may be defective.

TROUBLESHOOTING HINTS
- The front parking light bulb may be defective
- The stop/taillight bulb may be defective
- The license plate light bulb may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the operation of each light.

Q: Which light does not illuminate?

Front parking light (LH), taillight (LH) and license plate light: Go to Step 2.
Front parking light (RH) and taillight (RH): Go to Step 4.
Taillight (LH) and license plate light: Go to Step 6.
Taillight (LH): Go to Step 8.
Taillight (RH): Go to Step 13.
Front parking light (LH): Go to Step 19.
Front parking light (RH): Go to Step 25.
License plate light: Go to Step 31.
All lights: Refer to Inspection Procedure I-1 "The taillights do not illuminate normally."







STEP 2. Check joint connector C-28 and front-ECU
connector A-13X for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

Q: Are joint connector C-28 and front-ECU connector A-13X in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The front parking light (LH), taillight (LH) and the license plate light should illuminate normally.







STEP 3. Check the wiring harness between joint connector C-28 (terminal 1) and front-ECU connector A-13X (terminal 4).

Q: Is the wiring harness between joint connector C-28 (terminal 1) and front-ECU connector A-13X (terminal 4) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The front parking light (LH), taillight (LH) and the license plate light should illuminate normally.







STEP 4. Check joint connector C-28 and front-ECU connector A-13X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are joint connector C-28 and front-ECU connector A-13X in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The front parking light (RH) and the taillight (RH) should illuminate normally.







STEP 5. Check the wiring harness between joint connector C-28 (terminal 18) and front-ECU connector A-13X (terminal 4).

Q: Is the wiring harness between joint connector C-28 (terminal 18) and front-ECU connector A-13X (terminal 4) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The front parking light (RH) and the taillight (RH) should illuminate normally.




STEP 6. Check joint connector C-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is joint connector C-28 in good condition?

YES: Go to Step 7.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The taillight (LH) and the license plate light should illuminate normally.







STEP 7. Check the wiring harness between joint connector C-28 (terminal 4) and rear combination light (LH) connector F-14 (terminal 4).

NOTE: Also check intermediate connector C-26 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-26 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between joint connector C-28 (terminal 4) and rear combination light (LH) connector F-14 (terminal 4) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The taillight (LH) and the license plate light should illuminate normally.




STEP 8. Check rear combination light (LH) connector F-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 9.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the taillight (LH) illuminates normally.

STEP 9. Check the stop/taillight bulb (LH).

1. Remove the stop/taillight bulb (LH).
2. Verify that the stop/taillight bulb (LH) is not damaged or burned out.

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

YES: Go to Step 10.

NO: Replace the stop/taillight bulb (LH). Verify that the taillight (LH) illuminates normally.

STEP 10. Check the ground circuit to the rear combination light (LH). Measure the resistance at rear combination light (LH) connector F-14.




1. Disconnect rear combination light (LH) connector F-14 and measure the resistance available at the wiring harness side of the connector.




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

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 12.

NO: Go to Step 11.




STEP 11. Check the wiring harness between rear combination light (LH) connector F-14 (terminal 5) and ground.

Q: Is the wiring harness between rear combination light (LH) connector F-14 (terminal 5) and ground in good condition?

YES: Replace the rear combination light socket (LH). Verify that the taillight (LH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the taillight (LH) illuminates normally.







STEP 12. Check the wiring harness between rear combination light (LH) connector F-14 (terminal 3) and intermediate connector C-26 (terminal 10).

Q: Is the wiring harness between rear combination light (LH) connector F-14 (terminal 3) and intermediate connector C-26 (terminal 10) in good condition?

YES: Replace the rear combination light socket (LH). Verify that the taillight (LH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the taillight (LH) illuminates normally.




STEP 13. Check rear combination light (RH) connector F-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear combination light (RH) connector F-07 in good condition?

YES: Go to Step 14.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the taillight (RH) illuminates normally.

STEP 14. Check the stop/taillight bulb (RH).

1. Remove the stop/taillight bulb (RH).
2. Verify that the stop/taillight bulb (RH) is not damaged or burned out.

Q: Is the stop/taillight bulb (RH) in good condition?

YES: Go to Step 15.

NO: Replace the stop/taillight bulb (RH). Verify that the taillight (RH) illuminates normally.

STEP 15. Check the ground circuit to the rear combination light (RH). Measure the resistance at rear combination light (RH) connector F-07.




1. Disconnect rear light (RH) connector F-07 and measure the resistance available at the wiring harness side of the connector.




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

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 17.

NO: Go to Step 16.




STEP 16. Check the wiring harness between rear combination light (RH) connector F-07 (terminal 5) and ground.

Q: Is the wiring harness between rear combination light (RH) connector F-07 (terminal 5) and ground in good condition?

YES: Replace the rear combination light socket (RH). Verify that the taillight (RH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the taillight (RH) illuminates normally.




STEP 17. Check joint connector C-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is joint connector C-28 in good condition?

YES: Go to Step 18.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the taillight (RH) illuminates normally.










STEP 18. Check the wiring harness between rear combination light (RH) connector F-07 (terminal 3) and joint connector C-28 (terminal 22).

NOTE: Also check intermediate connector C-24, junction block connectors C-203 and C-208 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24, junction block connector C-203 or C-208 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between rear combination light (RH) connector F-07 (terminal 3) and joint connector C-28 (terminal 22) in good condition?

YES: Replace the rear combination light socket (RH). Verify that the taillight (RH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the taillight (RH) illuminates normally.




STEP 19. Check front combination light (LH) connector A-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front combination light (LH) connector A-17 in good condition?

YES: Go to Step 20.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front parking light (LH) illuminates normally.

STEP 20. Check the front parking light bulb (LH).

1. Remove the front parking light bulb (LH).
2. Verify that the front parking light bulb (LH) is not damaged or burned out.

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

YES: Go to Step 21.

NO: Replace the front parking light bulb (LH). Verify that the front parking light (LH) illuminates normally.

STEP 21. Check the ground circuit to the front parking light (LH). Measure the resistance at front combination light (LH) connector A-17.




1. Disconnect front combination light (LH) connector A-17 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 1 and ground.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 23.

NO: Go to Step 22.




STEP 22. Check the wiring harness between front combination light (LH) connector A-17 (terminal 1) and ground.

Q: Is the wiring harness between front combination light (LH) connector A-17 (terminal 1) and ground in good condition?

YES: Replace the front combination light socket (LH). Verify that the front parking light (LH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the front parking light (LH) illuminates normally.




STEP 23. Check joint connector C-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is joint connector C-28 in good condition?

YES: Go to Step 24.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front parking light (LH) illuminates normally.







STEP 24. Check the wiring harness between front combination light (LH) connector A-17 (terminal 2) and joint connector C-28 (terminal 2).

Q: Is the wiring harness between front combination light (LH) connector A-17 (terminal 2) and joint connector C-28 (terminal 2) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the front parking light (LH) illuminates normally.




STEP 25. Check front combination light (RH) connector A-36 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front combination light (RH) connector A-36 in good condition?

YES: Go to Step 26.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front parking light (RH) illuminates normally.

STEP 26. Check the front parking light bulb (RH).

1. Remove the front parking light bulb (RH).
2. Verify that the front parking light bulb (RH) is not damaged or burned out.

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

YES: Go to Step 27.

NO: Replace the front side marker light bulb (RH). Verify that the front parking light (RH) illuminates normally.

STEP 27. Check the ground circuit to the front parking light (RH). Measure the resistance at front combination light (RH) connector A-36.




1. Disconnect front combination light (RH) connector A-36, and measure the resistance available at the harness side of the connector.




2. Measure the resistance value between terminal 1 and ground.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 29.

NO: Go to Step 28.




STEP 28. Check the wiring harness between front combination light (RH) connector A-36 (terminal 1) and ground.

Q: Is the wiring harness between front combination light (RH) connector A-36 (terminal 1) and ground in good condition?

YES: Replace the front combination light socket (RH). Verify that the front parking light (RH) illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the front parking light (RH) illuminates normally.




STEP 29. Check joint connector C-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is joint connector C-28 in good condition?

YES: Go to Step 30.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front parking light (RH) illuminates normally.







STEP 30. Check the wiring harness between front combination light (RH) connector A-36 (terminal 2) and joint connector C-28 (terminal 19).

Q: Is the wiring harness between front combination light (RH) connector A-36 (terminal 2) and joint connector C-28 (terminal 19) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the front parking light (RH) illuminates normally.




STEP 31. Check license plate light connector F-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is license plate light connector F-10 in good condition?

YES: Go to Step 32.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the license plate light illuminate normally.

STEP 32. Check the license plate light bulb.

1. Remove the license plate light bulb.
2. Verify that the license plate light bulb is not damaged or burned out.

Q: Is the license plate light bulb in good condition?

YES: Go to Step 33.

NO: Replace the license plate light bulb. Verify that the license plate light illuminate normally.

STEP 33. Check the ground circuit to the license plate light. Measure the resistance at license plate light connector F-10.




1. Disconnect license plate light connector F-10 and measure the resistance available at the wiring harness side of the connector.




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

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 35.

NO: Go to Step 34.




STEP 34. Check the wiring harness between license plate light connector F-10 (terminal 2) and ground.

Q: Is the wiring harness between license plate light connector F-10 (terminal 2) and ground in good condition?

YES: Replace the license plate light socket. Verify that the license plate light illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the license plate light illuminate normally.




STEP 35. Check intermediate connector C-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is intermediate connector C-26 in good condition?

YES: Go to Step 36.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the license plate light illuminate normally.







STEP 36. Check the wiring harness between license plate light connector F-10 (terminal 1) and intermediate connector C-26 (terminal 10).

Q: Is the wiring harness between license plate light connector F-10 (terminal 1) and intermediate connector C-26 (terminal 10) in good condition?

YES: Replace the license plate light socket. Verify that the license plate light illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the license plate light illuminate normally.