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

A003TC0E01

INSPECTION PROCEDURE

PROCEDURE


  1. 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 OTHER PROBLEM (Proceed to Problem Symptoms table) Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (DOOR LOCK STATUS)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Read the Data List according to the display on the intelligent tester.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      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 intelligent tester indicates "Permit" or "Prohibt" according to the door lock operation shown in the table.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Perform the Active Test according to the display on the intelligent tester.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Test Part Control Range Diagnostic Note
      Trunk and Back-Door Open Operate back door lock motor ON or OFF -
      OK
      The back door lock assembly unlatches when ON is selected.

    NG

    INSPECT BACK DOOR LOCK ASSEMBLY Click here

    OK

    GO TO ENTRY AND START SYSTEM Click here

  4. INSPECT BACK DOOR LOCK ASSEMBLY


    1. A003UBME30
      Text in Illustration
      *1

      Component without harness connected

      (Back Door Lock Assembly)
      *a Lock
      *b 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 battery voltage to the door lock motor and check the operation of the door lock motor.

        OK
        Connection Result

        Battery positive (+) → Terminal 2(ACT+)

        Battery negative (-) → Terminal 1(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 Switch Condition Specified Condition
        1 (ACT-) - 3 (D+) Locked 10 kΩ or higher
        1 (ACT-) - 3 (D+) Unlocked Below 1 Ω

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MAIN BODY ECU)


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

    2. Disconnect the 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
      R3-2 (ACT+) - 2D-9 (TR+) Always Below 1 Ω
      R3-2 (ACT+) - Body ground Always 10 kΩ or higher
      R3-3 (D+) - E120-19 (BCTY) Always Below 1 Ω
      R3-3 (D+) - Body ground Always 10 kΩ or higher
      R3-1 (ACT-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Replace the instrument panel junction block assembly.


    NEXT

  7. CHECK BACK DOOR OPEN OPERATION


    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    OK

    END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)