BACK DOOR CLOSER SYSTEM Back Door cannot be Opened

DESCRIPTION

When the back door cannot be opened, one of the following may be malfunctioning: 1) multiplex network door ECU, 2) back door lock assembly, 3) back door opener switch assembly, 4) main body ECU (multiplex network body ECU), or 5) certification ECU (smart key ECU assembly).

WIRING DIAGRAM

A018J72E03

CAUTION / NOTICE / HINT

Note


  • If the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

  • The back door closer system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Back Door > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC B2250 is output B
      DTC B2251 is output C

    B

    GO TO DTC CHART Click here

    C

    GO TO DTC CHART Click here

    A

  2. CHECK BASIC FUNCTIONS


    1. Check the basic functions of the power door lock.

      Click here

      OK
      The basic functions of the power door lock can be operated normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  3. READ VALUE USING GTS


    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 / Main Body / Data List.

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Back Door Open Back door condition signal Permit or Prohibit

      Permit: Back door unlocked

      Prohibit: Back door locked

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Open
      OK
      On the GTS screen, Permit or Prohibit is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

  4. READ VALUE USING GTS


    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 / Back Door / Data List.

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


      Body Electrical > Back Door > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Door Lock Status Back door lock condition signal Lock or Unlock

      Lock: Back door locked

      Unlock: Back door unlocked

      		 -

      Body Electrical > Back Door > Data List
      Tester Display
      Door Lock Status
      OK
      On the GTS screen, Lock or Unlock is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    OK

  5. READ VALUE USING GTS


    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. 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 Unlock SW Back door opener switch assembly signal ON or OFF

      ON: Back door opener switch assembly on

      OFF: Back door opener switch assembly off

      		 -

      Body Electrical > Entry&Start > Data List
      Tester Display
      Tr/B-Door Unlock SW
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  6. INSPECT BACK DOOR LOCK ASSEMBLY


    1. Remove the back door lock assembly.

      Click here

    2. Inspect the back door lock assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND)


    1. Disconnect the X19 back door lock assembly connector.

    2. Disconnect the X6 and X7 multiplex network door ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X19-1 (M+) - X7-10 (DC+) Always Below 1 Ω
      X19-2 (M-) - X7-9 (DC-) Always Below 1 Ω
      X19-3 (CTY) - X6-19 (FUL) Always Below 1 Ω
      X19-5 (CLS) - X6-21 (HAF) Always Below 1 Ω
      X19-6 (OPN) - X6-24 (POS) Always Below 1 Ω
      X19-4 (E) - Body ground Always Below 1 Ω
      X19-1 (M+) or X7-10 (DC+) - Body ground Always 10 kΩ or higher
      X19-2 (M-) or X7-9 (DC-) - Body ground Always 10 kΩ or higher
      X19-3 (CTY) or X6-19 (FUL) - Body ground Always 10 kΩ or higher
      X19-5 (CLS) or X6-21 (HAF) - Body ground Always 10 kΩ or higher
      X19-6 (OPN) or X6-24 (POS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE MULTIPLEX NETWORK DOOR ECU


    1. Temporarily replace the multiplex network door ECU with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK BACK DOOR OPEN OPERATION


    1. Check the back door open operation.

      Click here

      Result
      Result Proceed to
      Back door can be opened A
      Back door cannot be opened B

    A

    END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  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 HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)


    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
      q1-3 (BDSU) - F12-5 (TSW5) Always Below 1 Ω
      q1-2 (GND) - Body ground Always Below 1 Ω
      q1-3 (BDSU) or F12-5 (TSW5) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR