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 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

WIRING DIAGRAM

B338300E02

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. READ VALUE USING GTS

    1. Check the Data List for proper functioning of the back door courtesy switch.

      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

      -

      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 U13 back door lock assembly connector.

    2. Disconnect the U18 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

      U13-3 (CTY) - U18-19 (FUL)

      Always

      Below 1 Ω

      U13-4 (E) - Body ground

      Always

      Below 1 Ω

      U13-3 (CTY) or U18-19 (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