Diagnostic Procedure

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

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) ."
   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.
        Fig 1: Connecting Scan Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.
      • 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.
          Fig 2: Measuring Voltage Between Terminal 4 & Ground

          Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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 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. Refer to 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.