BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The back door motor unit (power back door ECU)*1 or multiplex network door ECU (back door closer ECU)*2 receives signals from the latch switch, sector switch and back door courtesy switch, which are built into the back door lock. Based on these switch signals, the latch position of the back door lock is determined.


DTC No. DTC Detection Condition Trouble Area
B2251 While back door closer is operating, a malfunction is detected in position information from back door courtesy switch within specified amount of time

  • Back door lock assembly

  • Wire harness or connector

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

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

WIRING DIAGRAM

A01CGGJE11

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BACK DOOR COURTESY SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Check if the switch is functioning 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 BACK DOOR MOTOR UNIT (POWER BACK DOOR ECU) Click here

    C

    REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU) Click here

    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.

      A01CFLPE11
      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. Disconnect the N18*1 or N33*2 connector.


      • *1: w/ Power Back Door System

      • *2: w/o Power Back Door System

    2. w/ Power Back Door System


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

        A01CFYQE12
        Standard Resistance
        Tester Connection Condition Specified Condition
        U13-3 (CTY) - N18-20 (FUL) Always Below 1 Ω
        U13-4 (E) - Body ground Always Below 1 Ω
        U13-3 (CTY) - Body ground Always 10 kΩ or higher

    3. w/o Power Back Door System


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

        A01CDVUE11
        Standard Resistance
        Tester Connection Condition Specified Condition
        U13-3 (CTY) - N33-6 (FUL) Always Below 1 Ω
        U13-4 (E) - Body ground Always Below 1 Ω
        U13-3 (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 BACK DOOR MOTOR UNIT (POWER BACK DOOR ECU) Click here

    C

    REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU) Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR