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Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. STEP 1. Check the power supply system. 

    With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

    • Hazard warning light

    Q: Is the check result normal? 

    YES  : Go to Step 2.

    NO  : Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .

  2. STEP 2. Using scan tool MB991958, read the diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ".
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the ETACS-ECU related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

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

    NO  : Go to Step 3.

  3. STEP 3. Using scan tool MB991958, check data list. 

    Check the signals related to the power window operation.

    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ".
      Fig 2: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check the data list of the ETACS.
      • Turn the ignition switch to the LOCK (OFF) position.
        DATA LIST

        Item No. Item name Normal condition
        254 IG voltage Battery voltage
    4. Turn the ignition switch to the "LOCK" (OFF) position.

      OK: Normal condition is displayed. 

    Q: Is the check result normal? 

    YES  : Go to Step 4.

    NO  : Refer to INSPECTION PROCEDURE 2: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1) .

  4. STEP 4. 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 5.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.

  5. STEP 5. Check the fusible link (34) line of power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-309. 
    1. Disconnect ETACS-ECU connector C-309 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 1 and ground.
      Fig 3: Measuring Voltage Between Terminal 1 And Ground
      G05384071Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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 6.

  6. STEP 6. Check the wiring harness between ETACS-ECU connector C-309 (terminal 1) and fusible link (34). 

    Q: Is the wiring harness between ETACS-ECU connector C-309 (terminal 1) and fusible link (34) 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. Check that the power window works normally.

  7. STEP 7. Check ETACS-ECU connector C-307 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-307 in good condition? 

    YES  : Go to Step 8.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.

  8. STEP 8. Check the fusible link (36) line of power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-307. 
    1. Disconnect ETACS-ECU connector C-307 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 2 and ground.
      Fig 4: Measuring Voltage Between Terminal 2 And Ground
      G05384072Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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.

  9. STEP 9. Check the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36). 

    Q: Is the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36) 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. Check that the power window works normally.

  10. STEP 10. Check power window main switch connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is power window main switch connector E-15 in good condition? 

    YES  : Go to Step 11.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.

  11. STEP 11. Check the ETACS-ECU connector C-315 line circuit to the power window main switch. Measure the voltage at power window main switch connector E-15. 
    1. Disconnect power window main switch connector E-15 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 5 and ground.
      Fig 5: Measuring Voltage Between Terminal 5 And Ground
      G05394889Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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  14.

    NO  : Go to Step 12.

  12. STEP 12. Check ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-315 in good condition? 

    YES  : Go to Step 13.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.

  13. STEP 13. Check the wiring harness between ETACS-ECU connector C-315 (terminal 10) and power window main switch connector E-15 (terminal 5). 
    NOTE: Also check intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-128 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-315 (terminal 10) and power window main switch connector E-15 (terminal 5) 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. Check that the power window works normally.

  14. STEP 14. Check the ground circuit to the power window main switch. Measure the resistance at power window main switch connector E-15. 
    1. Disconnect power window main switch connector E-15 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 10 and ground.
      Fig 6: Measuring Resistance Value Between Terminal 10 And Ground
      G05394890Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • The resistance should be 2 ohms or less.

    Q: Is the measured resistance 2 ohms or less? 

    YES  : Go to Step  16.

    NO  : Go to Step 15.

  15. STEP 15. Check the wiring harness between power window main switch connector E-15 (terminal 10) and ground. 
    NOTE: Also check intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-128 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between power window main switch connector E-15 (terminal 10) 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. Check that the power window works normally.

  16. STEP 16. Retest the system. 

    Check that the all power windows work.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace ETACS-ECU. Check that the power window works normally.



Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, read the diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ".
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the power window main switch related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

    YES  : Diagnose the power window main switch. Refer to DIAGNOSTIC TROUBLE CODE CHART  .

    NO  : Go to Step 2.

  2. STEP 2. Check the power window main switch. 

    Check that the passenger's or rear power window works by means of the power window main switch.

    Q: Is the check result normal? 

    YES  : Go to Step 3.

    NO  : Refer to INSPECTION PROCEDURE 1 "POWER WINDOWS DO NOT WORK AT ALL  ".

  3. STEP 3. Check power window main switch connector E-15, front power window motor (LH) connector E-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are power window main switch connector E-15, front power window motor (LH) connector E-14 in good condition? 

    YES  : Go to Step 4.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.

  4. STEP 4. Check the wiring harness between power window main switch connector E-15 (terminals Nos. 2 and 6) and front power window motor (LH) connector E-14 (terminals Nos. 4 and 1). 

    Q: Is the wiring harness between power window main switch connector E-15 (terminals Nos. 2 and 6) and front power window motor (LH) connector E-14 (terminals Nos. 4 and 1) in good condition? 

    YES  : Go to Step 5.

    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. Check that the power works normally.

  5. STEP 5. Retest the system. 

    Check that the driver's power window works by means of the power window main switch.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace the front power window motor (LH). Check that the power works normally.



  1. STEP 1. Check the power window lock switch. 

    Q: Is the power window lock switch in the "UNLOCK" position? 

    YES  : Go to Step 2.

    NO  : Operate the power window lock switch to the "UNLOCK" position. When the power window sub switch is operated, the power windows should raise and lower normally.

  2. STEP 2. Check power window main switch connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is power window main switch connector E-15 in good condition? 

    YES  : Go to Step 3.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the power window sub switch is operated, the power windows should raise and lower normally.

  3. STEP 3. Determine a trouble spot. 

    Q: Which power window does not work? 

    Front passenger's door  : Go to Step 4.

    Rear left door  : Go to Step  13.

    Rear right door  : Go to Step  22.

  4. STEP 4. Check front power window sub switch connector E-09 and front power window motor (RH) connector E-10 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are front power window sub switch connector E-09 and front power window motor (RH) connector E-10 in good condition? 

    YES  : Go to Step 5.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

  5. STEP 5. Check the front power window sub switch for continuity. 
    1. Remove the front power window sub switch. Refer to DOOR GLASS AND REGULATOR  .
    2. Check continuity when the front power window sub switch is operated to "UP" or "DOWN" position.
      CONTINUITY CHART

      Switch position Tester connection Specified condition
      UP 4 - 5, 6 - 7 Continuity exists (2 Ω or less)
      OFF 4 - 5, 7 - 8 Continuity exists (2 Ω or less)
      DOWN 4 - 6, 7 - 8 Continuity exists (2 Ω or less)
      Fig 1: Identifying Power Window Sub Switch Connector Terminal
      G05384091Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the front power window sub switch normal? 

    YES  : Go to Step 6.

    NO  : Replace the front power window sub switch. When the front power window sub switch is operated, the front power window should raise and lower normally.

  6. STEP 6. Check the front power window motor (RH). 
    1. Remove the front power window regulator (RH). Refer to DOOR GLASS AND REGULATOR  .
    2. Connect a battery to the motor terminal, and check that the motor runs freely.
      BATTERY CONNECTION SLIDER POSITION CHART

      Battery connection Slider position
      • Connect terminal 1 to the negative battery terminal
      • Connect terminal 4 to the positive battery terminal
      		 UP
      • Connect terminal 4 to the negative battery terminal
      • Connect terminal 1 to the positive battery terminal
      		 DOWN
      Fig 2: Identifying Front Power Window Motor Connector Terminal
      G05384085Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the front power window motor (RH) normal? 

    YES  : Go to Step 7.

    NO  : Replace the front power window regulator (RH). When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

  7. STEP 7. Check the battery power supply circuit to the front power window sub switch. Measure the voltage at front power window sub switch connector E-09. 
    1. Disconnect front power window sub switch connector E-09 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 6 and ground.
      Fig 3: Measuring Voltage Between Terminal 6 And Ground
      G05384093Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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 8.

  8. STEP 8. Check ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-315 in good condition? 

    YES  : Go to Step 9.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

  9. STEP 9. Check the wiring harness between ETACS-ECU connector C-315 (terminal No. 8) and front power window sub switch connector E-09 (terminal No. 6). 
    NOTE: Also check intermediate connector C-116. If intermediate connector C-116 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-315 (terminal No. 8) and front power window sub switch connector E-09 (terminal No. 6) 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. When the front power window sub switch is operated, the front power window (RH) should raise and lower normally.

  10. STEP 10. Check the ground circuit to the front power window sub switch. Measure the resistance at front power window sub switch connector E-09. 
    1. Disconnect front power window sub switch connector E-09 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 5 and ground, and also between terminal 8 and ground.
      Fig 4: Measuring Resistance Value Between Terminal 5 And Ground
      G05384094Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • The resistance should be 2 ohms or less.

    Q: Is the measured resistance 2 ohms or less? 

    YES  : Go to Step  12.

    NO  : Go to Step 11.

  11. STEP 11. Check the wiring harness between power window main switch connector E-15 (terminals Nos. 1 and 3) and front power window sub switch connector E-09 (terminals Nos. 8 and 5). 
    NOTE: Also check intermediate connectors C-116 and C-128. If intermediate connector C-116 or C-128 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between power window main switch connector E-15 (terminals Nos. 1 and 3) and front power window sub switch connector E-09 (terminals Nos. 8 and 5) in good condition? 

    YES  : Replace the power window main switch. When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

    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. When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

  12. STEP 12. Check the wiring harness between front power window sub switch connector E-09 (terminals Nos. 4 and 7) and front power window motor (RH) connector E-10 (terminals Nos. 1 and 4). 

    Q: Is the wiring harness between front power window sub switch connector E-09 (terminals Nos. 4 and 7) and front power window motor (RH) connector E-10 (terminals Nos. 1 and 4) 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. When the front power window sub switch (RH) is operated, the front power window (RH) should raise and lower normally.

  13. STEP 13. Check rear power window sub switch (LH) connector E-24 and rear power window motor (LH) connector E-25 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are rear power window sub switch (LH) connector E-24 and rear power window motor (LH) connector E-25 in good condition? 

    YES  : Go to Step 14.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  14. STEP 14. Check the rear power window sub switch (LH) for continuity. 
    1. Remove the rear power window sub switch (LH). Refer to DOOR GLASS AND REGULATOR  .
    2. Check continuity when the rear power window sub switch (LH) is operated to "UP" or "DOWN" position.
      TESTER CONNECTION SPECIFIED CONDITION

      Switch position Tester connection Specified condition
      UP 4 - 5, 6 - 7 Continuity exists (2 Ω or less)
      OFF 4 - 5, 7 - 8 Continuity exists (2 Ω or less)
      DOWN 4 - 6, 7 - 8 Continuity exists (2 Ω or less)
      Fig 5: Identifying Rear Power Window Sub Switch (LH) Connector Terminal
      G05384095Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the rear power window sub switch (LH) normal? 

    YES  : Go to Step 15.

    NO  : Replace the rear power window sub switch (LH). When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  15. STEP 15. Check the rear power window motor (LH). 
    1. Remove the rear power window regulator (LH). Refer to DOOR GLASS AND REGULATOR  .
    2. Connect a battery to the motor terminal, and check that the motor runs freely.
      BATTERY CONNECTION SLIDER POSITION CHART

      Battery connection Slider position
      • Connect terminal 4 to the negative battery terminal
      • Connect terminal 1 to the positive battery terminal
      		 UP
      • Connect terminal 1 to the negative battery terminal
      • Connect terminal 4 to the positive battery terminal
      		 DOWN
      Fig 6: Identifying Rear Power Window Regulator (LH) Connector Terminal
      G05384096Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the rear power window motor (LH) normal? 

    YES  : Go to Step 16.

    NO  : Replace the rear power window regulator (LH). When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  16. STEP 16. Check the battery power supply circuit to the rear power window sub switch (LH). Measure the voltage at rear power window sub switch (LH) connector E-24. 
    1. Disconnect rear power window sub switch (LH) connector E-24 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 6 and ground.
      Fig 7: Measuring Voltage Between Terminal 6 And Ground
      G05394902Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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  19.

    NO  : Go to Step 17.

  17. STEP 17. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-311 in good condition? 

    YES  : Go to Step 18.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  18. STEP 18. Check the wiring harness between ETACS-ECU connector C-311 (terminal No. 12) and rear power window sub switch (LH) connector E-24 (terminal No. 6). 
    NOTE: Also check joint connector (5) D-27, intermediate connector D-24. If joint connector (5) D-27, intermediate connector D-24 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-311 (terminal No. 12) and rear power window sub switch (LH) connector E-24 (terminal No. 6) 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. When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  19. STEP 19. Check the ground circuit to the rear power window sub switch (LH). Measure the resistance at rear power window sub switch (LH) connector E-24. 
    1. Disconnect rear power window sub switch (LH) connector E-24 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 5 and ground, and also between terminal 8 and ground.
      Fig 8: Measuring Resistance Value Between Terminal 5 And Ground
      G05394903Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • The resistance should be 2 ohms or less.

    Q: Is the measured resistance 2 ohms or less? 

    YES  : Go to Step  21.

    NO  : Go to Step 20.

  20. STEP 20. Check the wiring harness between power window main switch connector E-15 (terminals Nos. 18 and 19) and rear power window sub switch (LH) connector E-24 (terminals Nos. 5 and 8). 
    NOTE: Also check intermediate connectors C-42, C-128 and D-24. If intermediate connectors C-42, C-128 or D-24 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between power window main switch connector E-15 (terminals Nos. 18 and 19) and rear power window sub switch (LH) connector E-24 (terminals Nos. 5 and 8) in good condition? 

    YES  : Replace the power window main switch. When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

    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. When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  21. STEP 21. Check the wiring harness between rear power window sub switch (LH) connector E-24 (terminals Nos. 4 and 7) and rear power window motor (LH) connector E-25 (terminals Nos. 4 and 1). 

    Q: Is the wiring harness between rear power window sub switch (LH) connector E-24 (terminals Nos. 4 and 7) and rear power window motor (LH) connector E-25 (terminals Nos. 4 and 1) in good condition? 

    YES  : Replace the power window main switch. When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

    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. When the rear power window sub switch (LH) is operated, the rear power window (LH) should raise and lower normally.

  22. STEP 22. Check rear power window sub switch (RH) connector E-21 and rear power window motor (RH) connector E-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are rear power window sub switch (RH) connector E-21 and rear power window motor (RH) connector E-20 in good condition? 

    YES  : Go to Step 23.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  23. STEP 23. Check the rear power window sub switch (RH) for continuity. 
    1. Remove the rear power window sub switch (RH). Refer to DOOR GLASS AND REGULATOR  .
    2. Check continuity when the rear power window sub switch (RH) is operated to "UP" or "DOWN" position.
      CONTINUITY CHART

      Switch position Tester connection Specified condition
      UP 4 - 5, 6 - 7 Continuity exists (2 Ω or less)
      OFF 4 - 5, 7 - 8 Continuity exists (2 Ω or less)
      DOWN 4 - 6, 7 - 8 Continuity exists (2 Ω or less)
      Fig 9: Identifying Rear Power Window Sub Switch (LH) Connector Terminal
      G05384095Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the rear power window sub switch (RH) normal? 

    YES  : Go to Step 24.

    NO  : Replace the rear power window sub switch (RH). When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  24. STEP 24. Check the rear power window motor (RH). 
    1. Remove the rear power window regulator (RH). Refer to DOOR GLASS AND REGULATOR  .
    2. Connect a battery to the motor terminal, and check that the motor runs freely.
      BATTERY CONNECTION SLIDER POSITION CHART

      Battery connection Slider position
      • Connect terminal 4 to the negative battery terminal
      • Connect terminal 1 to the positive battery terminal
      		 UP
      • Connect terminal 1 to the negative battery terminal
      • Connect terminal 4 to the positive battery terminal
      		 DOWN
      Fig 10: Identifying Rear Power Window Motor (RH) Connector Terminal
      G05384096Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the rear power window motor (RH) normal? 

    YES  : Go to Step 25.

    NO  : Replace the rear power window regulator (RH). When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  25. STEP 25. Check the battery power supply circuit to the rear power window sub switch (RH). Measure the voltage at rear power window sub switch (RH) connector E-21. 
    1. Disconnect rear power window sub switch (RH) connector E-21 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 6 and ground.
      Fig 11: Measuring Voltage Between Terminal 6 And Ground
      G05394906Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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  28.

    NO  : Go to Step 26.

  26. STEP 26. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-311 in good condition? 

    YES  : Go to Step 27.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  27. STEP 27. Check the wiring harness between ETACS-ECU connector C-311 (terminal No. 12) and rear power window sub switch (RH) connector E-21 (terminal No. 6). 
    NOTE: Also check joint connector (5) D-27, intermediate connector D-01. If joint connector (5) D-27, intermediate connector D-01 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-311 (terminal No. 12) and rear power window sub switch (RH) connector E-21 (terminal No. 6) 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. When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  28. STEP 28. Check the ground circuit to the rear power window sub switch (RH). Measure the resistance at rear power window sub switch (RH) connector E-21. 
    1. Disconnect rear power window sub switch (RH) connector E-21 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 5 and ground, and also between terminal 8 and ground.
      Fig 12: Measuring Resistance Value Between Terminal 5 And Ground
      G05394907Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • The resistance should be 2 ohms or less.

    Q: Is the measured resistance 2 ohms or less? 

    YES  : Go to Step  30.

    NO  : Go to Step 29.

  29. STEP 29. Check the wiring harness between power window main switch connector E-15 (terminals Nos. 15 and 17) and rear power window sub switch (RH) connector E-21 (terminals Nos. 5 and 8). 
    NOTE: Also check intermediate connectors C-23, C-128 and D-01. If intermediate connectors C-23, C-128 or D-01 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between power window main switch connector E-15 (terminals 15 and 17) and rear power window sub switch (RH) connector E-21 (terminals 5 and 8) in good condition? 

    YES  : Replace the power window main switch. When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

    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. When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.

  30. STEP 30. Check the wiring harness between rear power window sub switch (RH) connector E-21 (terminals Nos. 4 and 7) and rear power window motor (RH) connector E-20 (terminals Nos. 4 and 1). 

    Q: Is the wiring harness between rear power window sub switch (RH) connector E-21 (terminals Nos. 4 and 7) and rear power window motor (RH) connector E-20 (terminals Nos. 4 and 1) 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. When the rear power window sub switch (RH) is operated, the rear power window (RH) should raise and lower normally.



Required Special Tools: 

  1. STEP 1. Check the power window main switch. 

    Check that the driver's power window works by means of the power window main switch.

    Q: Is the check result normal? 

    YES  : Go to Step 2.

    NO  : Refer to INSPECTION PROCEDURE 2 "DRIVER'S POWER WINDOW DOES NOT WORK BY MEANS OF THE POWER WINDOW MAIN SWITCH  ".

  2. STEP 2. Check the power window sub switch. 

    Check that each power window works by means of the respective power window sub switch when the power window lock switch is turned off.

    Q: Is the check result normal? 

    YES  : Go to Step 3.

    NO  : Refer to INSPECTION PROCEDURE 3 "RELEVANT POWER WINDOW(S) DOES NOT WORK BY MEANS OF THE FRONT AND REAR PASSENGER'S POWER WINDOW SUB SWITCHES  ".

  3. STEP 3. Check the power supply system. 

    With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

    • Hazard warning light

    Q: Is the check result normal? 

    YES  : Go to Step 4.

    NO  : Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .

  4. STEP 4. Using scan tool MB991958, read the diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ".
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the ETACS-ECU related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

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

    NO  : Go to Step 5.

  5. STEP 5. Check power window main switch connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is power window main switch connector E-15 in good condition? 

    YES  : Go to Step 6.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the power window main switch is operated, the front and/or rear passenger's power windows should raise and lower normally.

  6. STEP 6. Check the ETACS-ECU connector C-315 line circuit to the power window main switch. Measure the voltage at power window main switch connector E-15. 
    1. Disconnect power window main switch connector E-15 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 4 and ground.
      Fig 2: Measuring Voltage Between Terminal 4 And Ground
      G05394910Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • 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  9.

    NO  : Go to Step 7.

  7. STEP 7. Check ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-315 in good condition? 

    YES  : Go to Step 8.

    NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . When the When the power window main switch is operated, the front and/or rear passenger's power windows should raise and lower normally.

  8. STEP 8. Check the wiring harness between ETACS-ECU connector C-315 (terminal No. 8) and power window main switch connector E-15 (terminal No. 4). 
    NOTE: Also check intermediate connector C-128. If intermediate connector C-128 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-315 (terminal No. 8) and power window main switch connector E-15 (terminal No. 4) 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. When the When the power window main switch is operated, the front and/or rear passenger's power windows should raise and lower normally.

  9. STEP 9. Retest the system. 

    Replace the power window main switch. Check that the front and/or rear passenger's power windows work by means of the power window main switch.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace ETACS-ECU. Check that the power window works normally.



Required Special Tools: 

  1. STEP 1. Check the power supply system. 

    With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

    • Hazard warning lamp

    Q: Is the check result normal? 

    YES  : Go to Step 2.

    NO  : Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .

  2. STEP 2. Using scan tool MB991958, check data list. 

    Check the signals related to the power window timer function operation.

    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ".
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check the data list of the ETACS.
      • Turn the ignition switch to the LOCK (OFF) position.
      • Close the driver's door.
      • Close the passenger's door.
        VOLTAGE REFERENCE CHART

        Item No. Item name Normal condition
        254 IG voltage Battery voltage
        256 Dr door ajar switch Close
        257 As door ajar switch Close
    4. Turn the ignition switch to the "LOCK" (OFF) position.

      OK: Normal condition is displayed. 

    Q: Is the check result normal? 

    YES < Normal conditions are displayed for all the items. >  : Go to Step 3.

    NO < Normal condition is not displayed for item No. 254. >  : Refer to INSPECTION PROCEDURE 2: "THE IGNITION SWITCH (IG1) SIGNAL IS NOT RECEIVED ".

    NO < Normal condition is not displayed for item No. 256. >  : Refer to INSPECTION PROCEDURE 5: "THE FRONT DOOR SWITCH (DRIVER'S SIDE) SIGNAL IS NOT RECEIVED ".

    NO < Normal condition is not displayed for item No. 257. >  : Refer to INSPECTION PROCEDURE 6: THE FRONT DOOR SWITCH (PASSENGER'S SIDE) SIGNAL IS NOT RECEIVED. .

  3. STEP 3. Retest the system. 

    Check that the power window timer function works normally.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace the power window main switch. Check that the power window timer function works normally.



Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, read the diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ".
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the power window main switch related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

    YES  : Diagnose the power window main switch. Refer to DIAGNOSTIC TROUBLE CODE CHART  .

    NO  : Go to Step 2.

  2. STEP 2. Check the power window operating current. 

    Check that the power window operating current is normal (Refer to POWER WINDOW OPERATING CURRENT CHECK  ).

    Q: Is the check result normal? 

    YES  : Door window glass adjustment (Refer to DOOR WINDOW GLASS ADJUSTMENT  ). Then go to Step 3.

    NO  : Replace the power window motor. Verify that the power window anti-trap function works normally.

  3. STEP 3. Confirm the power window learning function. 

    Check that the power window switch has learned the fully closed position of the windows.

    Q: Is the check result normal? 

    YES  : Go to Step 4.

    NO  : Make the power window switch learn the fully closed position of the windows (Refer to LEARNING PROCEDURES OF THE POWER WINDOW FULLY CLOSED POSITION < DRIVER'S SIDE >  ). Verify that the power window anti-trap function works normally.

  4. STEP 4. Retest the system. 

    Check that the power window anti-trap function works.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace the front power window motor (LH). Verify that the power window anti-trap function works normally.



  1. STEP 1. Determine a trouble spot. 

    Q: Which type of the power window is installed on vehicle? 

    Driver's side seat  : Go to Step 2.

    Except driver's side seat  : Go to Step  3..

  2. STEP 2. Check the power window anti-trap function. 

    Check that the power window anti-trap function works. Refer to POWER WINDOW SAFETY MECHANISM CHECK < DRIVER'S SIDE >  .

    Q: Is the check result normal? 

    YES  : Go to Step 3.

    NO  : Refer to INSPECTION PROCEDURE 6 "POWER WINDOW ANTI-TRAP FUNCTION DOES NOT WORK NORMALLY  ".

  3. STEP 3. Check that the door window glasses are installed correctly. 

    Check that the door window glasses are installed correctly. Refer to DOOR WINDOW GLASS ADJUSTMENT  .

    Q: Is the check result normal? 

    YES  : Go to Step 4.

    NO  : Adjust the door window glass (Refer to DOOR WINDOW GLASS ADJUSTMENT  ).

  4. STEP 4. Retest the system. 

    Check that the power window does not lower while it is being raised.

    Q: Is the check result normal? 

    YES  : No action is necessary and testing is complete.

    NO  : Replace the power window motor of the defective window.

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