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

DTC Code DTC Name
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 electrical key switch and certification ECU).

WIRING DIAGRAM

B250207E01

CAUTION / NOTICE / HINT

Note:

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

  • When using the intelligent tester with the engine switch off to troubleshoot:

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

  • Check that there are no electrical key transmitters in the vehicle.

  • When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations depending on the settings. In order to perform the entry lock operation 3 or more times, an unlock operation must be performed once (any type of unlock operation is sufficient). However, only consecutive entry lock operations are limited. Using the wireless lock or other types of lock operations, it is possible to perform consecutive lock operations without this limitation.

  • Before replacing the certification ECU, refer to the entry and start system (for Entry Function) (Click here).

  • After repair, confirm DTC not reoccur with performing the "DTC Output Confirmation Operation".

PROCEDURE

  1. CHECK POWER DOOR LOCK OPERATION

    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.

    Result

    Result

    OK

    NG
    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM

    Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (DOOR LOCK POSITION SWITCH)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Read the Data List according to the display on the intelligent tester.

      Body Electrical > Main Body > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Back Door Lock Pos SW

      Back door lock

      OFF or ON

      ON: Back door unlocked

      OFF: Back door locked

      -

      OK

      On the intelligent tester screen, the display changes between ON and OFF as shown in the chart above.

    Result

    Result

    OK

    NG
    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Back Door Lock/Unlock Functions do not Operate)

    Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (UNLOCK SWITCH)

    1. Using the intelligent tester, read the Data List

      Click here

      Body Electrical > Entry&Start > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Tr/B-Door Unlock SW

      Back door electrical key switch (unlock switch)

      ON or OFF

      ON: Back door electrical key switch (unlock switch) pushed

      OFF: Back door electrical key switch (unlock switch) not pushed

      • Displays whether the back door electrical key switch (unlock switch) is on or off.

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

      OK

      The intelligent tester display changes correctly in response to the operation of the back door electrical key switch.

    Result

    Result

    OK

    NG
    OK

    REPLACE CERTIFICATION ECU

    NG

  4. CHECK HARNESS AND CONNECTOR (BACK DOOR ELECTRICAL KEY SWITCH - CERTIFICATION ECU)

    1. Disconnect the X6 back door electrical key switch connector.

    2. Disconnect the G26 certification ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      X6-5 (UL) - G26-22 (TSW5)

      Always

      Below 1 Ω

      X6-6 (E) - Body ground

      Always

      Below 1 Ω

      X6-5 (UL) or G26-22 (TSW5) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT BACK DOOR ELECTRICAL KEY SWITCH (UNLOCK SWITCH)

    1. E139345N06

      Remove the back door electrical key switch

      Click here

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      5 (UL) - 6 (E)

      No switch pushed

      10 kΩ or higher

      5 (UL) - 6 (E)

      Unlock switch pushed

      Below 1 Ω

    Result

    Result

    OK

    NG
    OK

    REPLACE CERTIFICATION ECU

    NG

    REPLACE BACK DOOR ELECTRICAL KEY SWITCH

    Click here