INSPECTION PROCEDURE 8: The rain sensitive AUTO wiper function works even though there is no rainfall <Vehicles with lighting control sensor>: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Lighting control sensor installation surface check 

   Visually check the presence of scratches or air bubbles (diameter of 5 mm or more) on the windshield to which the lighting control sensor is installed.

   Q: Is the check result normal? 

   • YES:  Go to Step 2.
   • NO:  Replace the windshield (Refer to WINDSHIELD ).
2. STEP 2. Windshield wiper operation check 

   Check that the windshield wipers work normally.

   Q: Is the check result normal? 

   • YES:  Go to Step 3.
   • NO:  Refer to INSPECTION PROCEDURE 3: WINDSHIELD WIPERS DO NOT STOP AT THE SPECIFIED PARK POSITION  .
3. STEP 3. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set. 

   Connect the scan tool. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."

   Q: Is the diagnostic trouble code set? 

   • YES:  Diagnose the ETACS-ECU. Refer to "DIAGNOSTIC TROUBLE CODE CHART ."
   • NO:  Go to Step 4.
   Fig 1: Connecting Special Tool MB991910 To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Using scan tool MB991958, read the lighting control sensor diagnostic trouble code. 

   Check if a lighting control sensor diagnostic trouble code is set. Connect the scan tool. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."

   Q: Is the diagnostic trouble code set? 

   • YES:  Diagnose the lighting control sensor. [Diagnostic Trouble Code: (Refer to DIAGNOSTIC TROUBLE CODE CHART ) or service data (DATA LIST REFERENCE TABLE  ).]
   • NO:  Go to Step 5.
5. STEP 5. Connector check: C-316 ETACS-ECU connector 

   Q: Is the check result normal? 

   • YES:  Go to Step 6.
   • NO:  Repair the damaged connector.
6. STEP 6. Measure the voltage at the C-316 ETACS-ECU connector. 
   1. Disconnect the connector, and measure the voltage at the wiring harness side.
   2. Measure the voltage between C-316 ETACS-ECU connector terminal No. 1 and body ground.

   OK: Battery positive voltage 

   Q: Is the check result normal? 

   • YES:  Replace the Lighting control sensor.
   • NO:  Go to Step 7.
   Fig 2: Measuring Voltage Between ETACS-ECU Connector C-316 Terminal No. 1 And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the wiring harness between C-316 ETACS-ECU connector terminal No. 1 and D-42 lighting control sensor connector terminal No. 3. 
   • Check the input and output lines for open or short circuit.

   Q: Is the check result normal? 

   • YES:  Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .)
   • NO:  Repair the wiring harness.