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

A0040V8E14

INSPECTION PROCEDURE

Note


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

  • w/ Entry System Back Door Open Function:

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

PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Entry System Back Door Open Function A
      w/ Entry System Back Door Open Function 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 function Click here.

      OK
      The power door lock basic functions operate normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. READ VALUE USING GTS (DOOR LOCK STATUS)


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door Open Back door lock/Permit or Prohibt

      Permit: Back door unlocked

      Prohibt: Back door locked

      		 -
      OK
      The GTS indicates Permit or Prohibit according to the door lock operation shown in the table.

    NG

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

    OK

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Trunk and Back-Door Open Back door lock motor OFF/ON -
      OK
      The back door lock assembly unlatches when ON is selected.

    NG

    INSPECT BACK DOOR LOCK ASSEMBLY Click here

    OK

  5. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.

      Main Body
      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

      		 -
      OK
      The GTS indicates ON or OFF according to the switch operation shown in the table.

    NG

    INSPECT BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

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

  6. INSPECT BACK DOOR LOCK ASSEMBLY


    1. A0040NSE17
      Text in Illustration
      *a

      Component without harness connected

      (Back Door Lock Assembly)
      *b Lock
      *c Unlock

      Remove the back door lock assembly Click here.

    2. Check the operation of the door lock motor.


      1. Move the door lock to the lock position.

      2. Apply auxiliary battery voltage to the door lock motor and check the operation of the door lock motor.

        OK
        Connection Result

        Auxiliary battery positive (+) → Terminal 4 (ACT+)

        Auxiliary battery negative (-) → Terminal 3 (ACT-)

        		 Unlocks

    3. Check the operation of the door courtesy switch.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        2 (+) - 1 (E) Locked 10 kΩ or higher
        2 (+) - 1 (E) Unlocked Below 1 Ω

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

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


    1. Disconnect the L7 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the 2D instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R18-4 (ACT+) - 2D-9 Always Below 1 Ω
      R18-4 (ACT+) - Body ground Always 10 kΩ or higher
      R18-2 (+) - L7-19 (BCTY) Always Below 1 Ω
      R18-2 (+) - Body ground Always 10 kΩ or higher
      R18-3 (ACT-) - Body ground Always Below 1 Ω
      R18-1 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Replace the instrument panel junction block assembly Click here.


    NEXT

  9. CHECK BACK DOOR OPEN OPERATION


    1. Check that the back door can be opened.

      OK
      The back door can be opened normally.

    NG

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

    OK

    END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)

  10. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. A004313E05
      Text in Illustration
      *a

      Component without harness connected

      (Back Door Opener Switch Assembly)

      Remove the back door opener switch assembly Click here.

    2. Check the operation of the opener switch.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (E) - 3 (UL) Back door opener switch not pushed 10 kΩ or higher
      2 (E) - 3 (UL) Back door opener switch pushed Below 1 Ω

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the L7 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
      V4-3 (UL) - L7-23 (BDSU) Always Below 1 Ω
      V4-3 (UL) - Body ground Always 10 kΩ or higher
      V4-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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