BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION


The back door motor unit*1 or multiplex network door ECU*2 receives signals from the half latch switch, initial 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

  • Back door motor unit*1

  • Multiplex network door ECU*2

WIRING DIAGRAM


  1. w/ Power Back Door System

    A01IFNZE03

  2. w/o Power Back Door System

    A01IFNZE04

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
      Result Proceed to
      OK (w/ Power Back Door System) A
      OK (w/o Power Back Door System) B
      NG C

    A

    REPLACE BACK DOOR MOTOR UNIT Click here

    B

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    C

  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
      Result Proceed to
      OK (w/ Power Back Door System) A
      OK (w/o Power Back Door System) B
      NG C

    B

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

    C

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - BACK DOOR MOTOR UNIT AND BODY GROUND)


    1. Disconnect the U9 back door lock assembly connector.

    2. Disconnect the K22 back door motor unit connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-8 (CTY) - K22-20 (FUL) Always Below 1 Ω
      U9-7 (E) - Body ground Always Below 1 Ω
      U9-8 (CTY) or K22-20 (FUL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BACK DOOR MOTOR UNIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the U9 back door lock assembly connector.

    2. Disconnect the K21 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
      U9-8 (CTY) - K21-12 (FUL) Always Below 1 Ω
      U9-7 (E) - Body ground Always Below 1 Ω
      U9-8 (CTY) or K21-12 (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