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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Keyless Operation System (Kos) - With Diagnostics) >> Diagnosis < Kos-Ecu > >> Symptom Procedures >> Inspection Procedure 6: Driver's door lock/unlock switch does not work >> Diagnosis

Inspection Procedure 6: Driver's door lock/unlock switch does not work: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Using scan tool (M.U.T.-III), read the diagnostic trouble code. 

    Check if any DTC is stored in the KOS-ECU.

    CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-III).
    1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III)  ."
    2. Turn the power supply mode of the engine switch to ON.
    3. Check if DTC is stored.
    4. Turn the power supply mode of the engine switch to OFF.

    Q: Is the DTC stored? 

    1. YES:  Refer to DIAGNOSTIC TROUBLE CODE CHART  .
    2. NO:  Go to Step 2.
  2. STEP 2. Lock/unlock switch (driver's side) check 

    Check that the lock/unlock switch (driver's side) is normal (Refer to INSPECTION ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 3.
    2. NO:  Replace the lock/unlock switch (driver's side).
  3. STEP 3. Resistance measurement at lock/unlock switch (driver's side) connector (ground line) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the lock/unlock switch (driver's side) connector (ground line) and body ground.

      OK: Continuity exists (2 Ω or less) 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 5.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of open circuit in ground line between the lock/unlock switch (driver's side) connector and the body ground. 
    NOTE: Before the wiring harness check, check the intermediate connectors, and repair if necessary.

    Q: Is the check result normal? 

    1. YES:  Go to  Step 6.
    2. NO:  Repair the wiring harness.
  5. STEP 5. Check of short to power supply, short to ground, and open circuit in DRRQ line between the KOS-ECU connector and the lock/unlock switch (driver's side) connector. 
    NOTE: Before the wiring harness check, check the intermediate connectors, and repair if necessary.

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Repair the wiring harness.
  6. STEP 6. KOS communication test 

    Using scan tool (M.U.T.-III), perform the antenna communication test to check that the outside transmission antenna assembly (driver's side) communicates normally (Refer to ON-VEHICLE SERVICE < KOS-ECU >  ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 7.
    2. NO:  Perform troubleshooting for the diagnostic trouble code No. B240A (Refer to DIAGNOSTIC TROUBLE CODE CHART  ).
  7. STEP 7. Check of the troubles 

    Operate the lock/unlock switch (driver's side) and check that the doors can be locked and unlocked.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO DEAL WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Replace KOS-ECU and register the ID codes (Refer to ON-VEHICLE SERVICE < KOS-ECU >  ).
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