Part 1

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

Taillights, Front Parking Lights, Front Side Marker Lights And License Plate Lights Circuit (Part 1):

Taillights, Front Parking Lights, Front Side Marker Lights And License Plate Lights Circuit (Part 2):

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

TROUBLESHOOTING HINTS
- The front parking light bulb may be defective
- The front side marker 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 Tool:
- 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), front side marker light (LH) and license plate light : Go to Step 2.
front parking light (RH), taillight (RH) and front side marker light (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.
license plate light (LH) : Go to Step 36.
license plate light (RH) : Go to Step 42.
front side marker lights : Go to Step 48.
front side marker light (LH) : Go to Step 49.
front side marker light (RH) : Go to Step 55.
All lights : Refer to Inspection Procedure H-1 "The taillights do not illuminate normally." Inspection Procedure H-1

STEP 2. Check joint connector C-01 and front-ECU connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are joint connector C-01 and front-ECU connector A-11X in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). The front parking light (LH), taillight (LH), front side marker light (LH) and the license plate light should illuminate normally.

STEP 3. Check the wiring harness between joint connector C-01 (terminal 1) and front-ECU connector A-11X (terminal 4).

- Check the communication lines for open circuit and short circuit.







Q: Is the wiring harness between joint connector C-01 (terminal 1) and front-ECU connector A-11X (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), front side marker light (LH) and the license plate light should illuminate normally.

STEP 4. Check joint connector C-01 and front-ECU connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are joint connector C-01 and front-ECU connector A-11X in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component(s). The front parking light (RH), the front side marker light (RH) and the taillight (RH) should illuminate normally.

STEP 5. Check the wiring harness between joint connector C-01 (terminal 18) and front-ECU connector A-11X (terminal 4).

- Check the communication lines for open circuit and short circuit.







Q: Is the wiring harness between joint connector C-01 (terminal 18) and front-ECU connector A-11X (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), the front side marker light (RH) and the taillight (RH) should illuminate normally.

STEP 6. Check joint connector C-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is joint connector C-01 in good condition?

YES : Go to Step 7.

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

STEP 7. Check the wiring harness between joint connector C-01 (terminal 4) and rear combination light (LH) connector F-09 (terminal 4).

- Check the communication lines for open circuit and short circuit.







NOTE: Also check intermediate connector C-25 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-25 is damaged, repair or replace the damaged component(s) as described.

Q: Is the wiring harness between joint connector C-01 (terminal 4) and rear combination light (LH) connector F-09 (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-09 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







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

YES : Go to Step 9.

NO : Repair or replace the damaged component(s). 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-09.







1. Disconnect rear combination light (LH) connector F-09 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 12.

NO : Go to Step 11.

STEP 11. Check the wiring harness between rear combination light (LH) connector F-09 (terminal 2) and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between rear combination light (LH) connector F-09 (terminal 2) 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-09 (terminal 4) and intermediate connector C-25 (terminal 10).

- Check the communication lines for open circuit and short circuit.







Q: Is the wiring harness between rear combination light (LH) connector F-09 (terminal 4) and intermediate connector C-25 (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-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is rear combination light (RH) connector F-03 in good condition?

YES : Go to Step 14.

NO : Repair or replace the damaged component(s). 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-03.







1. Disconnect rear light (RH) connector F-03 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 17.

NO : Go to Step 16.

STEP 16. Check the wiring harness between rear combination light (RH) connector F-03 (terminal 2) and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between rear combination light (RH) connector F-03 (terminal 2) 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-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is joint connector C-01 in good condition?

YES : Go to Step 18.

NO : Repair or replace the damaged component(s). Check that the taillight (RH) illuminates normally.

STEP 18. Check the wiring harness between rear combination light (RH) connector F-03 (terminal 4) and joint connector C-01 (terminal 22).

- Check the communication lines for open circuit and short circuit.












NOTE: Also check junction block connectors C-214 and C-204 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-214 or C-204 is damaged, repair or replace the damaged component(s) as described.

Q: Is the wiring harness between rear combination light (RH) connector F-03 (terminal 4) and joint connector C-01 (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-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is front combination light (LH) connector A-18 in good condition?

YES : Go to Step 20.

NO : Repair or replace the damaged component(s). 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.