SMART ENTRY AND START SYSTEM(for Entry Function) Back Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

If the entry lock and unlock functions do not operate for the back door only, the request code may not be being transmitted from the back door. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and smart door control receiver assembly is normal. In this case, there may be a problem with request code transmission (communication between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment)), or there may be electric wave interference.

WIRING DIAGRAM

A002B7QE02

CAUTION / NOTICE / HINT

Note


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

    Click here

  • When using the GTS with the engine switch off, connect the GTS to the DLC3 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 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 replacing the certification ECU (smart key ECU assembly), refer to 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".

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the door control switch on the power window regulator master switch assembly on the driver door 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. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTC B27A8 is not output A
      DTC B27A8 is output B

    B

    GO TO OTHER DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK WAVE ENVIRONMENT


    1. A002AQJC02
      *a Approximately 0.3 m (0.984 ft.)

      Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the electrical key antenna (outside luggage compartment) and perform an entry back door open/lock function check.

      Click here

      Tech Tips


      • Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the electrical key antenna (outside luggage compartment)

      • When the electrical key transmitter sub-assembly is brought near the electrical key antenna (outside luggage compartment), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.

      • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

      • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.

      • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

      Result
      Result Proceed to
      Entry function does not operate normally A
      Entry function operates normally B

    B

    AFFECTED BY WAVE INTERFERENCE

    A

  4. READ VALUE USING GTS (TR/B DOOR LOCK SW, 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 / Smart Key / Data List.

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


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

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

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

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

      • Use this Data List item to help determine if there is a switch malfunction when the back door lock function does not operate.
      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 Lock SW
      Tr/B-Door Unlock SW
      OK
      The GTS display changes correctly in response to the operation of the back door opener switch assembly.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. CHECK KEY DIAGNOSTIC MODE


    1. Check the following antenna in key diagnostic mode.


      Body Electrical > Entry&Start > Utility
      Tester Display
      Communication Check(Key Diag Mode)
    2. A002AQJC06
      *a 0.7 to 1 m (2.30 to 3.28 ft.)

      Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.


      1. Check the electrical key antenna (outside luggage compartment).

        When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the electrical key antenna (outside luggage compartment), check that the wireless buzzer sounds.

        Tech Tips

        If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

      Result
      Result Proceed to
      Wireless buzzer does not sound A
      Wireless buzzer sounds B

    B

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A

  6. CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the L24 electrical key antenna (outside luggage compartment) connector.

    2. Disconnect the F12 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L24-2 (ANTE8) - F12-2 (CLG8) Always Below 1 Ω
      L24-1 (CLGB) - F12-1 (CG8B) Always Below 1 Ω
      L24-2 (ANTE8) or F12-2 (CLG8) - Body ground Always 10 kΩ or higher
      L24-1 (CLGB) or F12-1 (CG8B) - Body ground Always 10 kΩ or higher

    4. Connect the F12 certification ECU (smart key ECU assembly) connector.

    5. Disconnect the L24 electrical key antenna (outside luggage compartment) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))


    1. Using an oscilloscope, check the waveform.

      A002C6WC11
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 *b Waveform 1
      OK
      Tester Connection Condition Tool Setting Specified Condition
      F12-2 (CLG8) - F13-11 (E)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Back door opener switch assembly off → on

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 1)
      F12-1 (CG8B) - F13-11 (E)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Back door opener switch assembly off → on

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 1)
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) Click here

    NG

  8. CHECK ENTRY LOCK OPERATION


    1. Connect all connectors and check that the entry lock and unlock functions operate.

      Click here

      Result
      Result Proceed to
      Entry function does not operate normally A
      Entry function operates normally B

    A

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B

    END (CONNECTOR WAS NOT CONNECTED SECURELY)

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


    1. Disconnect the q1 back door opener switch assembly connector.

    2. Disconnect the F12 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      q1-1 (TSW5) - F12-13 (TSW6) Always Below 1 Ω
      q1-3 (BDSU) - F12-5 (TSW5) Always Below 1 Ω
      q1-2 (GND) - Body ground Always Below 1 Ω
      q1-1 (TSW5) or F12-13 (TSW6) - Body ground Always 10 kΩ or higher
      q1-3 (BDSU) or F12-5 (TSW5) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. Remove the back door opener switch assembly.

      Click here

    2. Inspect the back door opener switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  11. CHECK ENTRY LOCK OPERATION


    1. Connect all connectors and check that the entry lock and unlock functions operate.

      Click here

      Result
      Result Proceed to
      Entry function does not operate normally A
      Entry function operates normally B

    A

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B

    END (CONNECTOR WAS NOT CONNECTED SECURELY)