BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The power back door ECU (power back door motor unit)*1 or back door closer ECU (multiplex network door ECU)*2 receives signals from the latch switch, sector 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. DTC Detection Condition Trouble Area
B2251 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

  • Wire harness or connector

  • Power back door ECU (Power back door motor unit)*1

  • Back door closer ECU (Multiplex network door ECU)*2

WIRING DIAGRAM

A01EKMME03

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS (BACK DOOR COURTESY SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check if the switch functions properly.

      Back Door (Power Back Door ECU*1 or Back Door Closer ECU*2)
      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

      		 -

      • *1: w/ Power Back Door System

      • *2: w/o Power Back Door System

      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (w/ Power Back Door System) B
      OK (w/o Power Back Door System) C

    B

    REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) Click here

    C

    REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

    A

  2. INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY SWITCH)


    1. Remove the back door lock assembly Click here.

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

      A01EITFE11
      Standard Resistance
      Back Door Courtesy Switch
      Tester Connection Condition Specified Condition
      3 (CTY) - 4 (E) Open-latch Below 1 Ω
      3 (CTY) - 4 (E) Half-latch Below 1 Ω
      3 (CTY) - 4 (E) Full-latch 10 kΩ or higher
      3 (CTY) - 4 (E) Over-latch 10 kΩ or higher

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU OR BACK DOOR CLOSER ECU)


    1. A01EMFFE22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Lock Assembly)
      *2

      Front view of wire harness connector

      (to Power Back Door ECU)

      w/ Power Back Door System


      1. Disconnect the R1 back door lock assembly connector and L20 power back door ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R1-3 (CTY) - L20-20 (FUL) Always Below 1 Ω
        R1-4 (E) - Body ground Always Below 1 Ω
        R1-3 (CTY) - Body ground Always 10 kΩ or higher
    2. A01EM9ME05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Back Door Lock Assembly)
      *2

      Front view of wire harness connector

      (to Back Door Closer ECU)

      w/o Power Back Door System


      1. Disconnect the R1 back door lock assembly connector and L21 back door closer ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R1-3 (CTY) - L21-6 (FUL) Always Below 1 Ω
        R1-4 (E) - Body ground Always 10 kΩ or higher
        R1-3 (CTY) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (w/ Power Back Door System) B
      OK (w/o Power Back Door System) C

    B

    REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) Click here

    C

    REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR