INSPECTION PROCEDURE 3: Windshield wipers do not stop at the specified park position: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check windshield wiper motor connector A-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is windshield wiper motor connector A-04 in good condition? 

   • YES:  Go to Step 2.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the windshield wiper works normally.
2. STEP 2. Check the windshield wiper motor. 
   1. Disconnect windshield wiper motor connector A-04.
   2. Connect the vehicle battery to the windshield wiper motor connector as shown in illustration, and operate the windshield wiper at low speed. While the windshield wiper is working, disconnect the battery at positions other than the specified park position to stop the windshield wiper motor.
   3. When the battery is connected as shown in illustration, the motor should run at low speed, and then stop at the specified park position.

   Q: Does the windshield wiper motor operate normally? 

   • YES:  Go to Step 3.
   • NO:  Replace the windshield wiper motor. The windshield wiper should now stop at the specified park position.
     Fig 1: Locating Windshield Wiper Motor Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the installation condition of the windshield wiper motor link plate. 

   Check if the windshield wiper motor link plate is installed into the wiper link assembly securely.

   Q: Is the check result normal? 

   • YES:  Go to Step 4
   • NO:  Repair the windshield wiper motor link plate installation. (Refer to WINDSHIELD WIPER  .)
4. STEP 4. Check the ground circuit to the windshield wiper motor. Measure the voltage at the windshield wiper motor connector A-04. 
   1. Disconnect windshield wiper motor connector A-04 and measure the voltage available at the wiring harness side of the connector.
   2. Turn the ignition switch to the "ACC" position.
   3. Measure the voltage between terminal 3 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

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

   • YES:  Go to  Step 7.
   • NO:  Go to Step 5.
     Fig 2: Measuring Voltage Between Windshield Wiper Motor Connector Terminal 3 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. 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 6.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
6. STEP 6. Check the wiring harness between ETACS-ECU connector C-304 (terminals 8, 12) and windshield wiper motor connector A-04 (terminals 5, 3). 
   • Check the output lines for open or short circuits.

   Q: Is the wiring harness between ETACS-ECU connector C-304 (terminals 8, 12) and windshield wiper motor connector A-04 (terminals 5, 3) in good condition? 

   • YES:  Go to Step 7.
   • NO:  Repair or replace the damaged component(s). Refer to CABLES AND WIRES CHECK .
7. STEP 7. Retest the system. 

   Check that the windshield wipers stops at the specified park position.

   Q: Is the check result normal? 

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