Inspection Procedure L-3

Fog Light: One of the Fog Lights does not Illuminate.

Fog Lights Circuit Part 1:

Fog Lights Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If one of the fog lights does not illuminate, the fog light relay or the fog light bulb may be defective. If the fog light indicator light does not illuminate, the combination meter may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the fog light bulb
- Malfunction of the combination meter
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check that the fog lights and the fog light indicator light illuminate.

Q: Do the fog lights and the fog light indicator light illuminate normally?

Only the fog light (LH) does not illuminate: Go to Step 2.

Only the fog light (RH) does not illuminate: Go to Step 8.

Only the fog light indicator light does not illuminate: Go to Step 14.

Both of the fog lights do not illuminate: Refer to Inspection procedure L-1 "Fog lights do not illuminate when the fog light switch is turned on".

STEP 2. Check the fog light bulb (LH).

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

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

YES: Go to Step 3.

NO: Replace the fog light bulb (LH). Check that the fog lights illuminate normally.

STEP 3. Measure at fog light (LH) connector A-28 in order to check the ground circuit to the fog light (LH).




1. Disconnect fog light (LH) connector A-28, 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 6.

NO: Go to Step 4.




STEP 4. Check fog light (LH) connector A-28 for damage.

Q: Is fog light (LH) connector A-28 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog lights illuminate normally.




STEP 5. Check the wiring harness between fog light (LH) connector A-28 (terminal 2) and ground.

Q: Is the wiring harness between fog light (LH) connector A-28 (terminal 2) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the fog lights illuminate normally.







STEP 6. Check fog light relay connector A-04X and fog light (LH) connector A-28 for damage.

Q: Are fog light relay connector A-04X and fog light (LH) connector A-28 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog lights illuminate normally.







STEP 7. Check the wiring harness between fog light relay connector A-04X (terminal 4) and fog light (LH) connector A-28 (terminal 1).

Q: Is the wiring harness between fog light relay connector A-04X (terminal 4) and fog light (LH) connector A-28 (terminal 1) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the fog lights illuminate normally.

STEP 8. Check the fog light bulb (RH).

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

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

YES: Go to Step 9.

NO: Replace the fog light bulb (RH). Check that the fog lights illuminate normally.

STEP 9. Measure at fog light (RH) connector A-31 in order to check the ground circuit to the fog light (RH).




1. Disconnect fog light (RH) connector A-31, 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 12.

NO: Go to Step 10.




STEP 10. Check fog light (RH) connector A-31 for damage.

Q: Is fog light (RH) connector A-31 in good condition?

YES: Go to Step 11.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog lights illuminate normally.




STEP 11. Check the wiring harness between fog light (RH) connector A-31 (terminal 2) and ground.

Q: Is the wiring harness between fog light (RH) connector A-31 (terminal 2) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the fog lights illuminate normally.







STEP 12. Check fog light relay connector A-04X and fog light (RH) connector A-31 for damage.

Q: Are fog light relay connector A-04X and fog light (RH) connector A-31 in good condition?

YES: Go to Step 13.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog lights illuminate normally.










STEP 13. Check the wiring harness between fog light relay connector A-04X (terminal 4) and fog light (RH) connector A-31 (terminal 1).

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

Q: Is the wiring harness between fog light relay connector A-04X (terminal 4) and fog light (RH) connector A-31 (terminal 1) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the fog lights illuminate normally.

STEP 14. Check the fog light indicator light bulb.

1. Remove the fog light indicator light bulb.
2. Check that the fog light indicator light bulb is not broken.

Q: Is the fog light indicator light bulb in good condition?

YES: Go to Step 15.

NO: Replace the fog light indicator light bulb. Check that the fog light indicator light illuminates normally.

STEP 15. Measure at combination meter connector C-43 in order to check the ground circuit to the fog light indicator light.




1. Disconnect fog light indicator light connector C-43, and measure at the wiring harness side.




2. Measure the resistance value between terminal 12 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 18.

NO: Go to Step 16.




STEP 16. Check combination meter connector C-43 for damage.

Q: Is combination meter connector C-43 in good condition?

YES: Go to Step 17.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog light indicator light illuminates normally.




STEP 17. Check the wiring harness between combination meter connector C-43 (terminal 12) and ground.

NOTE: Also check joint connector C-78. If joint connector C-78 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between combination meter connector C-43 (terminal 12) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the fog light indicator light illuminates normally.







STEP 18. Check fog light relay connector A-04X and combination meter connector C-43 for damage.

Q: Are fog light relay connector A-04X and combination meter connector C-43 in good condition?

YES: Go to Step 19.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the fog light indicator light illuminates normally.










STEP 19. Check the wiring harness between fog light relay connector A-04X (terminal 4) and combination meter connector C-43 (terminal 13).

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

Q: Is the wiring harness between fog light relay connector A-04X (terminal 4) and combination meter connector C-43 (terminal 13) in good condition?

YES: Replace the combination meter. Check that the fog light indicator light illuminates normally.

NO: Repair the wiring harness. Check that the fog light indicator light illuminates normally.