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Inspection Procedure 5: Keyless Entry System Does Not Work: Diagnosis

WARNING: This page is about a different variant/trim than selected.

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, check for CAN bus 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. Diagnose the CAN bus line.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the CAN bus line found to be normal? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the CAN bus line (Refer to DIAGNOSIS ).
      Fig 1: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  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)  ."
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the WCM related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

    1. YES:  Diagnose the WCM. Refer to DIAGNOSTIC TROUBLE CODE CHART  .
    2. NO:  Go to Step 3.
      Fig 2: Connecting Scan Tool To Data Link Connector
      G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the power supply system 

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

    • Headlights
    • Hazard warning light

    Q: Is the check result normal? 

    1. YES:  Go to Step 4.
    2. NO:  Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .
  4. STEP 4. Verify the central door locking system. 

    Check that the central door locking system works normally.

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Refer to TROUBLESHOOTING .
  5. STEP 5. Using scan tool MB991958, check data list. 

    Check the signals related to the keyless entry system 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)  ."
    2. Turn the ignition switch to the "LOCK" (OFF) position.
    3. Check the ETACS data list.
      • Close the driver's door.
      • Close the passenger's door.
      • Close the RH-side rear door.
      • Close the LH-side rear door.
      • Close the trunk lid.
      • Remove the ignition key from the ignition key cylinder.
        ITEM REFERENCE

        Item No. Item name Normal condition
        Item 256 Dr door ajar switch Close
        Item 257 As door ajar switch Close
        Item 258 RR door ajar switch Close
        Item 259 RL door ajar switch Close
        Item 260 Trunk/gate trunk ajar switch Close
        Item 264 Handle lock switch Key in → Key out
        Fig 3: Connecting Scan Tool To Data Link Connector
        G05373979Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

        OK: Normal condition is displayed. 

    Q: Are the check results normal? 

    1. YES <Normal conditions are displayed for all the items.>:  Go to Step 6.
    2. NO <Normal condition is not displayed for item No. 256.>:  Refer to INSPECTION PROCEDURE 5: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (LH) .
    3. NO <Normal condition is not displayed for item No. 257.>:  Refer to INSPECTION PROCEDURE 6: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (RH) .
    4. NO <Normal condition is not displayed for item No. 258.>:  Refer to INSPECTION PROCEDURE 8: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE REAR DOOR SWITCH (RH) .
    5. NO <Normal condition is not displayed for item No. 260.>:  Refer to INSPECTION PROCEDURE 9: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE TRUNK LID LATCH. .
    6. NO <Normal condition is not displayed for item No. 264.>:  Refer to INSPECTION PROCEDURE 3: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE KEY REMINDER SWITCH. .
  6. STEP 6. Check receiver antenna assembly connector D-14 and WCM connector C-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is the receiver antenna assembly connector D-14 and WCM connector C-07 in good condition? 

    1. YES:  Go to Step 7.
    2. NO:  Repair the defective connector.
  7. STEP 7. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the WCM connector C-07 (terminal Nos. 1, 3 and 5) for open circuit. 
    1. Disconnect receiver antenna assembly connector D-14 and WCM connector C-07, and check the wiring harness.
    2. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 1) and WCM connector C-07 (terminal No. 1).

      OK: Continuity exists (2 Ω or less) 

      Fig 4: Checking Wiring Harness Between Receiver Antenna Terminal 1 And WCM Terminal 1
      G05395436Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 3) and WCM connector C-07 (terminal No. 3).

      OK: Continuity exists (2 Ω or less) 

      Fig 5: Checking Wiring Harness Between Receiver Antenna Terminal 3 And WCM Terminal 3
      G05395437Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 5) and WCM connector C-07 (terminal No. 5).

      OK: Continuity exists (2 Ω or less) 

      Fig 6: Checking Wiring Harness Between Receiver Antenna Terminal 5 And WCM Terminal 5
      G05395438Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the WCM connector C-07 (terminal Nos. 1, 3 and 5) in good condition? 

    1. YES:  Go to Step 8.
    2. NO (receiver antenna assembly connector D-14 terminal No. 1 - WCM connector C-07 terminal No. 1.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 1) and WCM connector C-07 (terminal No. 1).
    3. NO (receiver antenna assembly connector D-14 terminal No. 3 - WCM connector C-07 terminal No. 3.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 3) and WCM connector C-07 (terminal No. 3).
    4. NO (receiver antenna assembly connector D-14 terminal No. 5 - WCM connector C-07 terminal No. 5.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 5) and WCM connector C-07 (terminal No. 5).
  8. STEP 8. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the ground for short circuit. 
    1. Disconnect receiver antenna assembly connector D-14 and WCM connector C-07, and check the wiring harness.
    2. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 1) and ground

      OK: No continuity 

      Fig 7: Checking Wiring Harness Between Receiver Antenna Assembly Connector D-14 Terminal 1 And Ground
      G05395076Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 3) and ground

      OK: No continuity 

      Fig 8: Checking Wiring Harness Between Receiver Antenna Assembly Connector D-14 Terminal 3 And Ground
      G05395079Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Check the wiring harness between receiver antenna assembly connector D-14 (terminal No. 5) and ground

      OK: No continuity 

      Fig 9: Checking Wiring Harness Between Receiver Antenna Assembly Connector D-14 Terminal 5 And Ground
      G05395080Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the ground in good condition? 

    1. YES:  Go to Step 9.
    2. NO (receiver antenna assembly connector D-14 terminal No. 1 - ground.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 1) and the ground.
    3. NO (receiver antenna assembly connector D-14 terminal No. 3 - ground.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 3) and the ground.
    4. NO (receiver antenna assembly connector D-14 terminal No. 5 - ground.):  Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No. 5) and the ground.
  9. STEP 9. Retest the system. 

    Replace the receiver antenna assembly. Check if the keyless entry system works normally.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Replace WCM and register the ID codes (Refer to ID CODES REGISTRATION JUDGMENT TABLE  ).
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