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 REMOVAL AND INSTALLATION ).

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  .

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) ".

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Is the diagnostic trouble code set? 

   YES  : Diagnose the ETACS-ECU. Refer to "DIAGNOSTIC TROUBLE CODE CHART ".

   NO  : Go to Step 4.

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. [Diagnosis Code: (Refer to DIAGNOSIS 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.
      Fig 2: Measuring Voltage Between C-316 ETACS-ECU Connector Terminal No. 1 And Body Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      OK: Battery voltage 

   Q: Is the check result normal? 

   YES  : Replace the Lighting control sensor.

   NO  : Go to Step 7.

7. STEP 7. Check the wiring harness between C-316 ETACS-ECU connector terminal No.1 and D-02 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 MALFUNCTION .)

   NO  : Repair the wiring harness.