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) receives signals from the latch switch, sector switch, back door courtesy switch and pawl 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 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)

WIRING DIAGRAM

A01NCVEE02

INSPECTION PROCEDURE

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Check if the switch functions properly.

      Back Door (Power Back Door ECU (Power Back Door Motor Unit))
      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

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY SWITCH) Click here

    OK

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

  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.

      A01ND3EE01
      Standard Resistance
      Tester Connection Condition Specified Condition
      8 (CTY) - 7 (E) Open-latch Below 1 Ω
      8 (CTY) - 7 (E) Half-latch Below 1 Ω
      8 (CTY) - 7 (E) Full-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)


    1. A01NE6YE05
      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 (Power Back Door Motor Unit))

      Disconnect the Y10 back door lock connector and P33 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y10-8 (CTY) - P33-20 (FUL) Always Below 1 Ω
      Y10-7 (E) - Body ground Always Below 1 Ω
      Y10-8 (CTY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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