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. When a signal received is the main body ECU (multiplex network body ECU) activates the back door lock motor.

WIRING DIAGRAM

A018JB8E09

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • 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/ Smart Entry and Start System:

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

    Click here

  • 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. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Smart Entry and Start System A
      w/ Smart Entry and Start System B

    B

    INSPECT BACK DOOR LOCK ASSEMBLY Click here

    A

  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.

    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 Prohibit or Permit

      Prohibit: Back door locked

      Permit: Back door unlocked

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Open
      OK
      The GTS displays Permit or Prohibit according to the back door lock assembly operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 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.

    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 OFF or ON

      OFF: Back door opener switch not pushed

      ON: Back door opener switch pushed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Open Handle SW
      OK
      The GTS displays ON or OFF according to the back door opener switch assembly operation.
      Result
      Proceed to
      OK
      NG

    OK

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


    1. Disconnect the F19 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
      q1-3 (UL) - F19-18 (BDSU) Always Below 1 Ω
      q1-2 (E) - Body ground Always Below 1 Ω
      q1-3 (UL) or F19-18 (BDSU) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 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 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the 4H 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
      X18-2 (ACT+) - 4H-4 Always Below 1 Ω
      X18-3 (D+) - 4H-33 Always Below 1 Ω
      X18-1 (ACT-) - Body ground Always Below 1 Ω
      X18-2 (ACT+) or 4H-4 - Body ground Always 10 kΩ or higher
      X18-3 (D+) or 4H-33 - Body ground Always 10 kΩ or higher
      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.

      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) Click here