INSPECTION PROCEDURE 10: The Windshield Washer Does Not Work Normally: 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. Verify the windshield wiper operation. 

   Q: Does the windshield wiper operate normally? 

   • YES:  Go to Step 2.
   • NO:  Refer to INSPECTION PROCEDURE 1 "THE WINDSHIELD WIPERS DO NOT WORK AT ALL"  .
2. STEP 2. 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 3.
     Fig 1: Connecting Scan Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the input signal related to the windshield washer operation. 
   • Ignition switch: ACC
   • Windshield washer switch: ON
     SCAN TOOL DISPLAY CHART
     
     

     Item No.	Display on scan tool	Normal condition
     Item 237	Front washer	ON

     OK: Normal condition is displayed. 

     Q: Is the check result normal? 

     • NO:  Go to Step 4.
     • YES:  Refer to ETACS, INPUT SIGNAL CHART .
4. STEP 4. Check windshield washer motor connector D-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is windshield washer motor connector D-20 in good condition? 

   • YES:  Go to Step 5.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the windshield wiper works normally.
5. STEP 5. Check the operation of windshield washer motor. 
   1. Disconnect windshield washer motor connector D-20 and check at windshield washer motor connector side.
   2. Fill the windshield washer tank with washer fluid.
   3. When battery voltage is applied between terminals 1 and 2, washer fluid should spray out.

      Q: Does the washer motor operate normally? 

      • YES:  Go to Step 6.
      • NO:  Replace the washer motor. Verify that the windshield washer works normally.
        Fig 2: Checking Operation Of Windshield Washer Motor

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check ETACS-ECU connector C-304 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-304 in good condition? 

   • YES:  Go to Step 7.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the windshield washer works normally.
7. STEP 7. Measure the voltage at ETACS-ECU connector C-304. 
   1. Disconnect ETACS-ECU connector C-304 and measure the resistance available at the wiring harness side of the connector.
   2. Ignition switch: ACC
   3. windshield washer switch: ON
   4. Measure the voltage between C-304 ETACS-ECU connector terminal No. 13 and body ground.

      OK: Battery positive voltage 

      Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

      • YES:  Go to Step  10.
      • NO:  Go to Step 8.
        Fig 3: Measuring Voltage Between C-304 ETACS-ECU Connector Terminal No. 13 & Body Ground

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
8. STEP 8. Check the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13). 
   NOTE: Prior to the wiring harness inspection, check intermediate connector C-47 and repair if necessary.
   • Check the input lines for open or short circuit.

     Q: Is the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13) in good condition? 

     • YES:  Go to Step 9.
     • NO:  Repair or replace the damaged component(s). Refer to CABLES AND WIRE CHECK .
9. STEP 9. Check the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14). 
   NOTE: Prior to the wiring harness inspection, check intermediate connector C-47 and repair if necessary.
   • Check the input lines for open or short circuit.

     Q: Is the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14) in good condition? 

     • YES:  Go to Step 10.
     • NO:  Repair or replace the damaged component(s). Refer to CABLES AND WIRE CHECK .
10. STEP 10. Retest the system. 

    Check that the windshield washers work normally.

    Q: Is the check result normal? 

    • YES:  Intermittent malfunction. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
    • NO:  Replace the ETACS-ECU.