INSPECTION PROCEDURE 1: The windshield wipers do not work at all: 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. Use the M.U.T.-III 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 TABLE ."
   • NO:  Go to Step 2.
     Fig 1: Connecting Scan Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using M.U.T.-III, check data list. 

   Check the input signal related to the windshield wiper. operation.

   • Ignition switch: ACC
   • Operate the windshield wiper switch at each switch position.

     Item No.	Item name	Windshield wiper switch position	Normal condition
     Item 235	Front wiper ACT	LO	ON
     		HI
     		INT	ON and OFF
     		MIST	ON
     Item 288	ACC switch		ON

     OK: Normal condition is displayed. 

   Q: Is the check result normal? 

   • YES < Normal conditions are displayed for all items >:  Go to Step 3.
   • NO < Normal condition is not displayed for item No. 235 >:  Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis - INSPECTION PROCEDURE 11: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE COLUMN SWITCH SIGNAL .
   • NO < Normal condition is not displayed for item No. 288 >:  Refer to INSPECTION PROCEDURE 1 "THE IGNITION SWITCH (ACC) SIGNAL IS NOT RECEIVED" .
3. STEP 3. 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 4.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the windshield wiper works normally.
4. STEP 4. Check the windshield wiper motor. 
   1. Disconnect windshield wiper motor connector A-04.
   2. Connect a battery to the windshield wiper motor as shown in illustration. Then check that the windshield wiper motor operates normally at high and low speeds.

   Q: Does the windshield wiper motor operate normally? 

   • YES:  Go to Step 5.
   • NO:  Replace the windshield wiper motor. Verify that the windshield wiper works normally.
     Fig 2: Locating Windshield Wiper Motor Connector (A-04)

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the ground circuit to the windshield wiper motor. Measure the resistance at the windshield wiper motor connector A-04. 
   1. Disconnect windshield wiper motor connector A-04 and measure the resistance available at the wiring harness side of the connector.
   2. Measure the resistance value between terminal 2 and ground.
      • The resistance should be 2 ohms or less.

   Q: Is the measured resistance 2 ohms or less? 

   • YES:  Go to  Step 7.
   • NO:  Go to Step 6.
     Fig 3: Measuring Resistance Between Windshield Wiper Motor Connector Terminal 2 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between windshield wiper motor connector A-04 (terminal 2) and ground. 

   Q: Is the wiring harness between windshield wiper motor connector A-04 (terminal 2) and ground in good condition? 

   • YES:  No action is necessary and testing is complete.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify the windshield wiper works normally.
7. STEP 7. Check ETACS-ECU connector C-309 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-309 in good condition? 

   • YES:  Go to Step 8.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the windshield wiper works normally.
8. STEP 8. Measure the voltage at ETACS-ECU connector C-309. 
   1. Disconnect ETACS-ECU connector C-309 and measure the resistance available at the wiring harness side of the connector.
   2. Measure the voltage between terminal 1 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 10.
   • NO:  Go to Step 9.
     Fig 4: Measuring Voltage Between ETACS-ECU Connector C-309 Terminal 1 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the wiring harness between ETACS-ECU connector C-309 (terminal 1) and the fusible link (34). 
   • Check the power supply line for open circuits.

   Q: Is the wiring harness between ETACS-ECU connector C-309 (terminal 1) and the fusible link (34) in good condition? 

   • YES:  Intermittent malfunction. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
   • NO:  Repair or replace the damaged component(s). Refer to CABLES AND WIRES CHECK .
10. STEP 10. 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 11.
    • NO:  Repair the damaged connector.
11. STEP 11. 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 wiper switch: HI
    4. Measure the voltage between C-304 ETACS-ECU connector terminal No. 5 and ground.

       OK: Battery positive voltage 

    5. windshield wiper switch: LO
       Fig 5: Measuring Voltage Between ETACS-ECU Connector C-304 Terminal 5 And Ground

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    6. Measure the voltage between C-304 ETACS-ECU connector terminal No. 6 and body ground.

       OK: Battery positive voltage 

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

    • YES:  Go to  Step 13.
    • NO:  Go to Step 12.
      Fig 6: Measuring Voltage Between ETACS-ECU Connector C-304 Terminal 6 And Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
12. STEP 12. Check the wiring harness between ETACS-ECU connector C-304 (terminals 5, 6) and windshield wiper motor connector A-04 (terminals 4, 1). 
    • Check the input and output lines for open or short circuit.

    Q: Is the wiring harness between ETACS-ECU connector C-304 (terminals 5, 6) and windshield wiper motor connector A-04 (terminals 4, 1) in good condition? 

    • YES:  Go to Step 13.
    • NO:  Repair or replace the damaged component(s). Refer to CABLES AND WIRES CHECK .
13. STEP 13. Retest the system. 

    Check that the windshield wipers work normally.

    Q: Is the check result normal? 

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