POWER DOOR LOCK CONTROL SYSTEM Only Back Door cannot be Opened

DESCRIPTION

The body ECU receives signals from the certification ECU (smart key ECU assembly). Then, the body ECU activates the back door lock motor.

WIRING DIAGRAM

B003RS7E01

CAUTION / NOTICE / HINT

Note


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

  • If the body ECU has been replaced, it is necessary to initialize the body ECU.

    Click here

  • Before performing the inspection, check that DTC B27B0 (Smart Entry and Start System) (for Entry Function) is not output.*

  • As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.

    Click here


PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specification.

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

    w/ Smart Entry and Start System

    CHECK SMART ENTRY AND START SYSTEM (for Entry Function) Click here

    w/o Smart Entry and Start System

  2. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. Remove the back door opener switch assembly.

    2. Inspect the back door opener switch assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)


    1. Disconnect the V2 back door lock assembly connector.

    2. Disconnect the 2M 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
      V10-3 (UL) - 2D-4 Always Below 1 Ω
      V10-3 (UL) or 2D-4 - Body ground Always 10 kΩ or higher
      V10-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

    2. Remove the body ECU from the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

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

      B003K0TC01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-17 (BDSU) - 2D-4 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 7 Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here

  5. CHECK SMART ENTRY AND START SYSTEM (for Entry Function)


    1. Check the smart entry and start system (for Entry Function).

      Click here

      OK
      Smart entry and start system (for Entry Function) operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO SMART ENTRY AND START SYSTEM (for Entry Function) 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 - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)


    1. Disconnect the V2 back door lock assembly connector.

    2. Disconnect the 2M 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
      V2-1 (ACT+) - 2M-1 Always Below 1 Ω
      V2-1 (ACT+) or 2M-1 - Body ground Always 10 kΩ or higher
      V2-2 (ACT-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

    2. Remove the body ECU from the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

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

      B003OB0C01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-4 (TR+) - 2M-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BODY ECU for LHD: Click here
    REPLACE BODY ECU for RHD: Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here