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

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DTC Code DTC Name
  Back Door Entry Lock Function does not Operate
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DESCRIPTION

If the back door entry lock function does not operate but the back door open function operates, the communication line between the vehicle and electrical key transmitter is normal. The entry lock switch circuit (certification ECU → back door switch) may be faulty.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • The entry and start system (for entry function) uses a multiplex communication system (LIN communication system) and 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 system is 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 tester and vehicle begins.

  • When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations according to 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.

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PROCEDURE


  1. Click here

    CHECK POWER DOOR LOCK OPERATION


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

      OK
      Door locks operate normally.

  2. Click here

    READ VALUE USING INTELLIGENT TESTER (BACK DOOR LOCK SWITCH)


    1. Using the intelligent tester, read the Data List (Click here).

      Table 1. Entry&Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tr/B-Door Lock SW Back door lock switch / ON or OFF

      ON: Back door lock switch pushed

      OFF: Back door lock switch not pushed

      		 -
      OK
      "ON" (lock switch is pushed) and "OFF" (lock switch is not pushed) appear on the screen.

  3. Click here

    INSPECT BACK DOOR OPENER SWITCH


    1. A01IT41E09

      Remove the back door opener switch (Click here).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (UL) - 2 (L) No switch pushed 10 kΩ or higher
      1 (UL) - 2 (L) Lock switch pushed Below 1 Ω

  4. Click here

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BACK DOOR OPENER SWITCH)


    1. A01IOWXE18

      Disconnect the S7 switch connector.

    2. Disconnect the H51 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S7-1 (UL) - H51-23 (TSW6) Always Below 1 Ω
      S7-1 (UL) - Body ground Always 10 kΩ or higher
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Opener Switch)
      *2

      Front view of wire harness connector

      (to Certification ECU)

  5. Click here

    REPLACE CERTIFICATION ECU

  6. Click here

    GO TO POWER DOOR LOCK CONTROL SYSTEMClick here

  7. Click here

    REPLACE BACK DOOR OPENER SWITCHClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR