POWER DOOR LOCK CONTROL SYSTEM Only Back Door cannot be Opened

DESCRIPTION

The main body ECU (multiplex network body ECU) receives signals from the back door opener switch assembly. Then, the main body ECU (multiplex network body ECU) activates the back door lock motor.

WIRING DIAGRAM

A01GB5CE01

CAUTION / NOTICE / HINT

Note


  • The power door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.

    Click here

  • w/ Entry and Start System:

    Before performing this troubleshooting, perform troubleshooting for "Back Door Entry Unlock Function does not Operate" for the Entry and start system (for Entry Function) first.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Proceed to
      w/o Entry and Start System
      w/ Entry and Start System

    w/ Entry and Start System

    INSPECT BACK DOOR LOCK ASSEMBLY Click here

    w/o Entry and Start System

  2. CHECK POWER DOOR LOCK OPERATION (BASIC FUNCTION)


    1. Check the power door lock basic functions.

      Click here

      OK
      The power door lock basic functions operate properly.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. READ VALUE USING GTS (Back Door Open)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    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 lock signal Permit or Prohibit

      Permit: Back door unlocked

      Prohibit: Back door locked

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Open
      OK
      The GTS indicates Permit or Prohibit according to the door lock operation shown in the table.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    OK

  4. PERFORM ACTIVE TEST USING GTS (Trunk and Back-Door Open)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Trunk and Back-Door Open Back door lock motor OFF/ON -

      Body Electrical > Main Body > Active Test
      Tester Display
      Trunk and Back-Door Open
      OK
      The back door lock assembly unlatches when ON is selected.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 8 Click here

    OK

  5. READ VALUE USING GTS (Back Door Open Handle SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    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 Handle SW Back door opener switch signal ON or OFF

      ON: Back door opener switch pushed

      OFF: Back door opener switch not pushed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Open Handle SW
      OK
      The GTS indicates ON or OFF according to the switch operation shown in the table.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

  6. 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

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)


    1. Disconnect the G78 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U7-3 (UL) - G78-23 (BDSU) Always Below 1 Ω
      U7-2 (E) - Body ground
      U7-3 (UL) or G78-23 (BDSU) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. 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

  9. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)


    1. Disconnect the 3E instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U12-2 (ACT+) - 3E-8 (TR+) Always Below 1 Ω
      U12-3 (D+) - 3E-33 (BCTY)
      U12-1 (ACT-) - Body ground
      U12-2 (ACT+) or 3E-8 (TR+) - Body ground Always 10 kΩ or higher
      U12-3 (D+) or 3E-33 (BCTY) - Body ground
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Replace the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK BACK DOOR OPEN OPERATION


    1. Check that the back door can be opened.

      OK
      The back door can be opened.
      Result
      Proceed to
      OK
      NG

    OK

    END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here