Inspection Procedure 2

Inspection Procedure 2: One of the front fog lights does not illuminate.

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


















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 ohms 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 Harness Connector Inspection 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-41or 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 Harness Connector Inspection 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 illuminate in good condition?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Go to Step 1.