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
- MB992006: Extra Fine Probe

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

Q: Which of the fog lights and the fog light indicator light does not 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 the fog lights and the fog light indicator light do not illuminate : Refer to Inspection Procedure L-1 "The fog lights do not illuminate when the fog light switch is turned on."

STEP 2. Check fog light (LH) connector A-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light (LH) connector A-32 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 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 4.

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

STEP 4. Check the ground circuit to the fog light (LH). Measure the resistance at fog light (LH) connector A-32.

1. Disconnect fog light (LH) connector A-32 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 6.

NO: Go to Step 5.

STEP 5. Check the wiring harness between fog light (LH) connector A-32 (terminal 2) and ground.

Q: Is the wiring harness between fog light (LH) connector A-32 (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 6. Check fog light relay connector A-04X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-04X in good condition?

YES: Go to Step 7.

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

STEP 7. Check the wiring harness between fog light relay connector A-04X (terminal 1) and fog light (LH) connector A-32 (terminal 1).

Q: Is the wiring harness between fog light relay connector A-04X (terminal 1) and fog light (LH) connector A-32 (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 8. Check fog light (RH) connector A-38 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light (RH) connector A-38 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 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 10.

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

STEP 10. Check the ground circuit to the fog light (RH). Measure the resistance at fog light (RH) connector A-38.

1. Disconnect fog light (RH) connector A-38 and measure the resistance available at the wiring harness side of the connector.

STEP 11. Check the wiring harness between fog light (RH) connector A-38 (terminal 2) and ground.

Q: Is the wiring harness between fog light (RH) connector A-38 (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 12. Check fog light relay connector A-04X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-04X in good condition?

YES: Go to Step 13.

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

STEP 13. Check the wiring harness between fog light relay connector A-04X (terminal 1) and fog light (RH) connector A-38 (terminal 1).

Q: Is the wiring harness between fog light relay connector A-04X (terminal 1) and fog light (RH) connector A-38 (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 14. Check combination meter connector C-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is combination meter connector C-02 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 light indicator light illuminates normally.

STEP 15. 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 16.

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

STEP 16. Check the ground circuit to the fog light indicator light. Measure the resistance at combination meter connector C-02.

1. Disconnect fog light indicator light connector C-02 and measure the resistance available at the wiring harness side of the connector.

2. Measure the resistance value between terminal 48 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 18.

NO: Go to Step 17.

STEP 17. Check the wiring harness between combination meter connector C-02 (terminal 48) and ground.

Q: Is the wiring harness between combination meter connector C-02 (terminal 48) 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 18. Check fog light relay connector A-04X and combination meter connector C-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are fog light relay connector A-04X and combination meter connector C-01 in good condition?

YES: Go to Step 19.

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

STEP 19. Check the wiring harness between fog light relay connector A-04X (terminal 1) and combination meter connector C-01 (terminal 20).

NOTE: Also check intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between fog light relay connector A-04X (terminal 1) and combination meter connector C-01 (terminal 20) 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.