Inspection Procedure L-3

Fog Light: One of the fog lights does not illuminate.

Fog Light Circuit Part 1:

Fog Light 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
- The fog light bulb may be defective
- The combination meter 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

STEP 1. Verify that the fog lights and the fog light indicator light illuminate operation.

Q: Which out of the fog lights and the fog light indicator light does not illuminate normally?

Both of the fog lights does not illuminate: Go to Step 2.
Only the fog light (LH) does not illuminate: Go to Step 4.
Only the fog light (RH) does not illuminate: Go to Step 10.
Only the fog light indicator light does not illuminate: Go to Step 16.
All of the fog lights and the fog light indicator light does not illuminate: Refer to Inspection procedure L-1 "Fog lights do not illuminate when the fog light switch is turned on".

STEP 2. Check fog light (LH) connector A-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light (LH) connector A-19 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the fog lights illuminate normally.

STEP 3. Check the wiring harness between fog light (LH) connector A-19 (terminal 2) and ground.

Q: Is the wiring harness between fog light (LH) connector A-19 (terminal 2) 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 fog lights illuminate normally.

STEP 4. Check the fog light bulb (LH).

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

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

YES: Go to Step 5.

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

STEP 5. Check fog light (LH) connector A-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light (LH) connector A-19 in good condition?

YES: Go to Step 6.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the fog lights illuminate normally.

STEP 6. Check the ground circuit to the fog light (LH). Measure the resistance at fog light (LH) connector A-19.

1. Disconnect fog light (LH) connector A-19 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 8.

NO: Go to Step 7.

STEP 7. Check the wiring harness between fog light (LH) connector A-19 (terminal 2) and ground.

Q: Is the wiring harness between fog light (LH) connector A-19 (terminal 2) 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 fog lights illuminate normally.

STEP 8. Check fog light relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-05X in good condition?

YES: Go to Step 9.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the fog lights illuminate normally.

STEP 9. Check the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (LH) connector A-19 (terminal 1).

Q: Is the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (LH) connector A-19 (terminal 1) 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 fog lights illuminate normally.

STEP 10. Check the fog light bulb (RH).

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

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

YES: Go to Step 11.

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

STEP 11. Check fog light (RH) connector A-24 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 12.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the fog lights illuminate normally.

STEP 12. Check the ground circuit to the fog light (RH). Measure the resistance at fog light (RH) connector A-24.

1. Disconnect fog light (RH) connector A-24 and measure the resistance available at the wiring harness side of the connector.

STEP 13. Check the wiring harness between fog light (RH) connector A-24 (terminal 2) and ground.

Q: Is the wiring harness between fog light (RH) connector A-24 (terminal 2) 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 fog lights illuminate normally.

STEP 14. Check fog light relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-05X in good condition?

YES: Go to Step 15.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the fog lights illuminate normally.

STEP 15. Check the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (RH) connector A-24 (terminal 1).

Q: Is the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (RH) connector A-24 (terminal 1) 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 fog lights illuminate normally.

STEP 16. Check the fog light indicator light bulb.

1. Remove the fog light indicator light bulb.
2. Verify that the fog light indicator light bulb is not damaged or burned out.

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

YES: Go to Step 17.

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

STEP 17. Check combination meter connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is combination meter connector C-05 in good condition?

YES: Go to Step 18.

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

STEP 18. Check the ground circuit to the fog light indicator light. Measure the resistance at combination meter connector C-05.

1. Disconnect fog light indicator light connector C-05 and measure the resistance available at the wiring harness side of the connector.

2. Measure the resistance value between terminal 12 and ground.
- The resistance should equal 2 Ohms or less.

Q: Is the measured resistance 2 Ohms or less?

YES: Go to Step 20.

NO: Go to Step 19.

STEP 19. Check the wiring harness between combination meter connector C-05 (terminal 12) and ground.

Q: Is the wiring harness between combination meter connector C-05 (terminal 12) 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 fog light indicator light illuminates normally.

STEP 20. Check fog light relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-05X in good condition?

YES: Go to Step 21.

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

STEP 21. Check the wiring harness between fog light relay connector A-05X (terminal 4) and combination meter connector C-05 (terminal 7).

NOTE: Also check intermediate connector C-116 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-116 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between fog light relay connector A-05X (terminal 4) and combination meter connector C-05 (terminal 7) in good condition?

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