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Part 1 of 3

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:




Taillights, 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
- The position light bulb may be defective
- The stop/taillight bulb may be defective
- The side marker 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 Tool:
- MB991223: Test Harness Set

STEP1. 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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 damaged component(s). Refer to Harness Connector Inspection. Verify that 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 block connector C-77 and intermediate connector C-89 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connectors C-77 or intermediate connector C-89 are damaged, repair or replace the damaged component(s) 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 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 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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 damaged component(s). Refer to Harness Connector Inspection. Verify that 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 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-06 or C-89 are damaged, repair or replace the damaged component(s) 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 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 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 7.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that 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 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 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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 damaged component(s). Refer to Harness Connector Inspection. Verify that 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, intermediate connectors C-89 and C-90 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-77, intermediate connectors C-89 or C-90 are damaged, repair or replace the damaged component(s) 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 is necessary and testing is complete.

NO: he 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 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 11.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that 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 connector C-101, C-112 intermediate connectors C-89 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-101, C-112 or intermediate connectors C-89 are 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-09 (terminal 5) and ground 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 tail light (RH) and the side marker light (RH) should illuminate normally.




STEP 12. Check front combination light (LH) connector A-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 13.

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

STEP 13. Check the position light bulb (LH).

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

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

YES: Go to Step 14.

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

STEP 14. Check the ground circuit to the front combination light (LH). Measure the resistance at position light (LH) connector A-26.




1. Disconnect front combination light (LH) connector A-26 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 equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 16.

NO: Go to Step 15.




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). Verify that the position 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 position light (LH) illuminates normally.




STEP 16. Check front-ECU connector A-10X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front-ECU connector A-10X in good condition?

YES: Go to Step 17.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the tail light (LH, incorporated in rear combination light) and the side marker light (LH) should illuminate normally. Verify 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 connectors C-89 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-77 or intermediate connector C-89 are damaged, repair or replace the damaged component(s) 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). Verify that the position 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 position light (LH) illuminates normally.
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