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Inspection Procedure J-3

INSPECTION PROCEDURE J-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 wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The fog light bulb may be defective

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Verify 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 does not illuminate : Refer to Inspection Procedure J-4 "The fog light indicator does not illuminate normally." Inspection Procedure J-4
Both of the fog lights do not illuminate : Refer to Inspection Procedure J-1 "Fog lights do not illuminate when the fog light switch is turned on." Inspection Procedure J-1

STEP 2. Check fog light (LH) connector A-22 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is fog light (LH) connector A-22 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). Check 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-22.







1. Disconnect fog light (LH) connector A-22 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 6.

NO : Go to Step 5.

STEP 5. Check the wiring harness between fog light (LH) connector A-22 (terminal 2) and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between fog light (LH) connector A-22 (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-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 7.

NO : Repair or replace the damaged component(s). Check that the fog lights illuminate normally.

STEP 7. Check the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (LH) connector A-22 (terminal 1).

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







Q: Is the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (LH) connector A-22 (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-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







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

YES : Go to Step 9.

NO : Repair or replace the damaged component(s). Check 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-28.







1. Disconnect fog light (RH) connector A-28 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 fog light (RH) connector A-28 (terminal 2) and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between fog light (RH) connector A-28 (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-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 13.

NO : Repair or replace the damaged component(s). Check that the fog lights illuminate normally.

STEP 13. Check the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (RH) connector A-28 (terminal 1).

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







Q: Is the wiring harness between fog light relay connector A-05X (terminal 4) and fog light (RH) connector A-28 (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.
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