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

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set

1. STEP 1. Check fog light (LH) connector A-34 or fog light (RH) connector A-44 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is fog light (LH) connector A-34 or fog light (RH) connector A-44 in good condition? 

   • YES:  Go to Step 2.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
2. 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.
3. Step 3. Check the ground circuit to the fog light (LH) or fog light (RH). Measure the resistance at fog light (LH) connector A-34 or fog light (RH) connector A-44. 
   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-34 fog light (LH) connector terminal No. 1 and ground
        Fig 1: Checking Resistance Between A-34 Fog Light (LH) Connector Terminal No. 1 And Ground

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • Resistance between A-44 front fog light (RH) connector terminal No. 1 and ground

        OK: The measured value should be continuity exists (2 ohms or less). 

   Q: Is the measured resistance 2 ohms or less? 

   • YES:  Go to  Step 5.
   • NO:  Go to Step 4.
     Fig 2: Checking Resistance Between A-44 Front Fog Light (RH) Connector Terminal No. 1 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. Step 4. Check the wiring harness between fog light (LH) connector A-34 (terminal 1) or fog light (RH) connector A-44 (terminal 1) and ground. 
   NOTE: Also check intermediate connector A-39 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-39 is damaged, repair or replace the connector . Refer to HARNESS CONNECTOR INSPECTION .
   • Check the ground wires for open circuit.

   Q: Is the wiring harness between fog light (LH) connector A-34 (terminal 1) or fog light (RH) connector A-44 (terminal 1) and ground in good condition? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • 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.
5. STEP 5. Check fog light relay connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is fog light relay connector A-11X in good condition? 

   • YES:  Go to Step 6.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
6. STEP 6. Check the wiring harness between fog light (LH) connector A-34 (terminal 2) or fog light (RH) connector A-44 (terminal 2) and fog light relay connector A-11X (terminal 3). 
   NOTE: Also check intermediate connector A-39 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-39 is damaged, repair or replace the connector . Refer to HARNESS CONNECTOR INSPECTION .
   • Check the power supply line for open circuit.

   Q: Is the wiring harness between fog light (LH) connector A-34 (terminal 2) or fog light (RH) connector A-44 (terminal 2) and fog light relay connector A-11X (terminal 3) in good condition? 

   • YES:  Go to Step 7.
   • 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.
7. 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 HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • NO:  Replace the fog light(s).