Inspection Procedure 1: The diagnostic trouble code is not set.: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set

1. STEP 1. Check headlight automatic leveling-ECU connector C-110 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is headlight automatic leveling-ECU connector C-110 in good condition? 

   YES:  Go to Step 2.

   NO:  Repair the damaged parts.

2. STEP 2. Resistance measurement at headlight automatic leveling-ECU connector C-110. 
   1. Disconnect the connector, and measure the resistance at the wiring harness-side connector.
   2. Measure the resistance between headlight automatic leveling-ECU connector C-110 (terminal No. 14) and body ground.

      The measured value should be continuity exists (2 Ω or less). 

   Q: Does the measured resistance value correspond with this range? 

   YES:  Go to  Step 4.

   NO:  Go to Step 3.

   Fig 1: Measuring Resistance Between Headlight Automatic Leveling-ECU Connector C-110 (Terminal No. 14) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 14) and body ground. 

   Q: Is the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 14) and body ground. in good condition? 

   YES:  Go to Step 4.

   NO:  Repair the wiring harness.

4. STEP 4. Voltage measurement at the C-110 headlight automatic leveling-ECU connector. 
   1. Disconnect the connector, and measure at the wiring harness-side connector.
   2. Turn the ignition switch to the "ON" position.
   3. Voltage between headlight automatic leveling-ECU connector (terminal No. 1) and body ground

      The voltage should measure approximately 12 volts (battery positive voltage). 

   Q: Does the voltage measure battery voltage? 

   YES:  Go to  Step 6.

   NO:  Go to Step 5.

   Fig 2: Checking Voltage Between Headlight Automatic Leveling-ECU Connector (Terminal No. 1) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 1) and fusible link (34). 
   NOTE: Before the wiring harness check, check the ETACS-ECU connectors C-309 and C-317, and the intermittent connector C-33. Then, repair them if necessary.

   Q: Is the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 1) and the fusible link (34) in good condition? 

   YES:  Go to Step 6.

   NO:  Repair the wiring harness.

6. STEP 6. Check data link connector C-125 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is data link connector C-125 in good condition? 

   YES:  Go to Step 7.

   NO:  Repair the damaged parts.

7. STEP 7. Check the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 5/7) and data link connector C-125 (terminal No. 1/10). 
   NOTE: Before the wiring harness check, check the intermittent connector C-33 and C-34. Then, repair them if necessary.

   Q: Is the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 5/7) and data link connector C-125 (terminal No. 1/10) in good condition? 

   YES:  Go to Step 8.

   NO:  Repair the wiring harness.

8. STEP 8. Retest the system. 

   Check if DTC is set.

   Q: Is the DTC set? 

   YES:  Refer to DIAGNOSTIC TROUBLE CODE CHART  .

   NO:  Replace the headlight automatic leveling-ECU.