BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The multiplex network door ECU receives signals from the latch switch, sector switch, pawl switch and back door courtesy switch, which are built into the back door lock assembly. Based on these switch signals, the latch position of the back door lock assembly is determined.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2251

Back Door Closer Switch Malfunction

While the back door closer is operating, a malfunction is detected in position information from the back door courtesy switch within a specified amount of time.

  • Back door lock assembly

  • Harness or connector

  • Multiplex network door ECU

  • Instrument panel junction block assembly

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note:

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

  • If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.

    Click here

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

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

PROCEDURE

  1. READ VALUE USING GTS

    1. Read the Data List according to the display on the GTS.

      Click here

      Body Electrical > Back Door > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Courtesy SW

      Back door courtesy switch signal

      ON or OFF

      ON: Back door open

      OFF: Back door closed

      *: Refer to "CONSTRUCTION AND OPERATION"

      *: Refer to "CONSTRUCTION AND OPERATION"

      Click here

      Body Electrical > Back Door > Data List

      Tester Display

      Courtesy SW

      OK

      The display is as specified in the normal condition column.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU

    Click here

    NG

  2. 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

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

    1. Disconnect the U27 back door lock assembly connector.

    2. Disconnect the U29 multiplex network door ECU connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      U27-4 (CTY) - U29-11 (FUL)

      Always

      Below 1 Ω

      3E-33 - U29-11 (FUL)

      Always

      Below 1 Ω

      U27-1 (E) - Body ground

      Always

      Below 1 Ω

      U27-4 (CTY) or U29-11 (FUL) - Body ground

      Always

      10 kΩ or higher

      3E-33 or U29-11 (FUL) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. READ VALUE USING GTS

    1. Disconnect the U28 multiplex network door ECU connector.

    2. Read the Data List according to the display on the GTS.

      Click here

      Body Electrical > Main Body > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Back Door Courtesy SW

      Back door courtesy switch signal

      ON or OFF

      ON: Back door open

      OFF: Back door closed

      -

      Body Electrical > Main Body > Data List

      Tester Display

      Back Door Courtesy SW

      OK

      The display is as specified in the normal condition column.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU

    Click here

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here