SMART ENTRY AND START SYSTEM(for Entry Function) Back Door Entry Unlock Function does not Operate

DESCRIPTION

If the entry unlock function does not operate for the back door only, but the entry lock function operates, the request code is being transmitted properly from the back door. In this case, there may be a problem related to the unlock switch (connection between the back door opener switch assembly and certification ECU (smart key ECU assembly)).

WIRING DIAGRAM

B003P5PE05

CAUTION / NOTICE / HINT

Note


  • The smart entry and start 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 entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.

  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN).

    While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • 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) or B27B0 is not output.

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

    Click here

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

  • w/ Automatic Light Control System:

    If the body ECU has been replaced, it is necessary to initialize the body ECU.

    Click here

  • w/ Door Control Battery:

    As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.

    Click here

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the door control switch on the power window regulator master switch assembly is operated, check that the doors unlock and lock according to the switch operation.

      Click here

      OK
      Door locks operate normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. READ VALUE USING GTS (TR/B-DOOR UNLOCK SW)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Entry&Start / Data List.

    5. According to the display on the GTS, read the Data List.


      Body Electrical > Entry&Start > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Tr/B-Door Unlock SW Back door opener switch assembly (open switch) ON or OFF

      ON: Back door opener switch assembly (open switch) pressed

      OFF: Back door opener switch assembly (open switch) not pressed

      • Displays whether the back door opener switch assembly (open switch) is on or off.

      • Use this Data List item to help determine if there is a switch malfunction when the back door open function does not operate.

      Body Electrical > Entry&Start > Data List
      Tester Display
      Tr/B-Door Unlock SW
      OK
      The GTS display changes correctly in response to the operation of the back door opener switch assembly.
      Result
      Result Proceed to
      NG A
      OK B

    B

    GO TO STEP 5 Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - BACK DOOR OPENER SWITCH ASSEMBLY)


    1. Disconnect the G16 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the V10 back door opener switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G16-14 (TSW5) - V10-3 (UL) Always Below 1 Ω
      G16-10 (E) - Body ground Always Below 1 Ω
      V10-2 (E) - Body ground Always Below 1 Ω
      G16-14 (TSW5) or V10-3 (UL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. Inspect the back door opener switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  5. CHECK ENTRY BACK DOOR UNLOCK OPERATION


    1. Check the entry back door unlock operation.

      Click here

      Tech Tips

      Disconnect and reconnect the connectors of certification ECU (smart key ECU assembly) and back door opener switch assembly before performing the inspection.

      OK
      Entry back door unlock operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (CONNECT CONNECTORS PROPERLY)

    NG

  6. REPLACE BODY ECU


    1. Replace the body ECU with a new or known good one.


      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK ENTRY BACK DOOR UNLOCK OPERATION


    1. Check the entry back door unlock operation.

      Click here

      OK
      Entry back door unlock operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (BODY ECU WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)