SMART KEY SYSTEM (for Entry Function) Driver Side Door Entry Unlock Function does not Operate

DESCRIPTION

If the entry unlock function does not operate for the driver door only, but the entry lock function operates, the request code is being transmitted properly from the driver door. In this case, there may be a problem related to the touch sensor (connection between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (for driver door) [unlock sensor]).

WIRING DIAGRAM

A01HNF8E19

INSPECTION PROCEDURE

Note


  • The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.

  • When using the Techstream with the engine switch off to troubleshoot:

    Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.

  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) precaution Click here.

  • After repair, confirm that no DTCs are output by performing the "DTC Output Confirmation Operation".

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation Click here.

      OK
      Door locks operate normally.

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. READ VALUE USING TECHSTREAM (UNLOCK DETECTION SWITCH)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the Techstream.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FL Door Lock Pos Front LH door unlock detection switch signal / UNLOCK or LOCK

      UNLOCK: Front LH door unlocked

      LOCK: Front LH door locked

      		 -

    NG

    GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) Click here

    OK

  3. READ VALUE USING TECHSTREAM (UNLOCK SENSOR)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Smart Key / Data List.

    5. Turn the Techstream on.

      Smart Key
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D-Door Touch Sensor Driver door touch sensor (unlock sensor) / ON or OFF

      ON: Driver door touch sensor (unlock sensor) touched

      OFF: Driver door touch sensor (unlock sensor) not touched

      • Displays whether the unlock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily).

      • Use this Data List item to help determine if there is an unlock sensor malfunction when the entry unlock function does not operate.
      OK
      The Techstream display changes correctly in response to the operation of the front door outside handle assembly LH (for driver door).

    NG

    CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH - CERTIFICATION ECU) Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

  4. CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH - CERTIFICATION ECU)


    1. Disconnect the W1 front door outside handle assembly LH (for driver door) connector.

    2. Disconnect the A43 and I78 certification ECU (smart key ECU assembly) connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      W1-4 (SENS) - I78-22 (SEN1) Always Below 1 Ω
      A43-11 (E) - Body ground Always Below 1 Ω
      W1-4 (SENS) or I78-22 (SEN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR) (DRIVER DOOR UNLOCK SENSOR SIGNAL INPUT)


    1. Connect the W1 front door outside handle assembly LH (for driver door) connector.

      A01HO21E10
      Text in Illustration
      *1 Waveform - -
      *a

      Component with harness connected

      (Certification ECU (smart key ECU assembly))

      		 *b In actuality, sampling is being performed

    2. Connect the A43 and I78 certification ECU (smart key ECU assembly) connectors.

    3. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      I78-22 (SEN1) - A43-11 (E)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors locked

      4. Electrical key transmitter sub-assembly not sufficiently close to vehicle

      5. Driver door unlock sensor not touched → touched

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform)

    NG

    REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FRONT DRIVER DOOR) Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here