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 half-latch switch, position switch, pawl switch and latch courtesy switch, which are built into the back door lock assembly. Based on these 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 system is operating, a malfunction in the position information from the latch courtesy switch is detected within a certain amount of time.

  • Back door lock assembly

  • Multiplex network door ECU

  • Harness or connector

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note


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

  • If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors has been disconnected, initialize the power back door system.

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PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Back Door / Data List.

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


      Body Electrical > Back Door > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Courtesy SW Latch courtesy switch signal OFF or ON

      OFF: Back door closed

      ON: Back door open

      		 *

      Body Electrical > Back Door > Data List
      Tester Display
      Courtesy SW

      *: Refer to Construction and Operation.

      Click here

      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 Z7 back door lock assembly connector.

    2. Disconnect the Z16 multiplex network door ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z7-8 (CTY) - Z16-11 (FUL) Always Below 1 Ω
      Z7-7 (E) - Body ground Always Below 1 Ω
      Z7-8 (CTY) or Z16-11 (FUL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR