Inspection Procedure 2

Inspection Procedure 2: The Right Or Left Fog Light Does Not Illuminate.

CAUTION: Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

Fog Light Circuit (Part 1):

Fog Light Circuit (Part 2):

TECHNICAL DESCRIPTION (COMMENT)
When one of the fog lights does not illuminate, the wiring harness connector(s), the bulb may be defective.

TROUBLESHOOTING HINTS
- Burned-out fog light bulb
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set

STEP 1. Check fog light (LH) connector A-41, fog light (RH) A-51 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light (LH) connector A-41, fog light (RH) A-51 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

STEP 2. Check the fog light bulb.

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

Q: Is the fog light bulb in good condition?

YES : Go to Step 3.

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

Step 3. Check the ground circuit to the fog light (LH) or fog light (RH). Measure the resistance at fog light (LH) connector A-41 or fog light (RH) connector A-51.

1. Disconnect the connector, and measure at the wiring harness side.




2. Check the resistance between the fog light connector and ground.
- Resistance between A-41 fog light (LH) connector terminal No.1 and ground
- Resistance between A-51 front fog light (RH) connector terminal No.1 and ground

OK: The resistance should be 2 ohm or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.

NO : Go to Step 4.

Step 4. Check the wiring harness between fog light (LH) connector A-41 or fog light (RH) connector A-51 (terminal 1) and ground.

NOTE: Also check intermediate connector A-46 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-46 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.

- Check the ground wires for open circuit.

Q: Is the wiring harness between fog light (LH) connector A-41 or fog light (RH) connector A-51 (terminal 1) and ground in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness.

STEP 5. Check fog light relay connector A-14X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is fog light relay connector A-14X in good condition?

YES : Go to Step 6.

NO : Repair the damaged parts.

STEP 6. Check the wiring harness between fog light (LH) connector A-41 or fog light (RH) connector A-51 (terminal 2) and fog light
relay connector A-14X (terminal 3).

NOTE: Also check intermediate connector A-46 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-46 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection.

- Check the power supply line for open circuit.

Q: Is the wiring harness between fog light (LH) connector A-41 or fog light (RH) connector A-51 (terminal 2) and fog light relay connector A-14X (terminal 3) in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness.

STEP 7. Retest the system.

Q: Does the right or left fog light does not illuminate in good condition?

YES : The trouble can be an intermittent malfunction (Refer to general (Body and Chassis), How to use Troubleshooting/inspection Service Points How to Cope with Intermittent Malfunction).

NO : Go to Step 1.