POWER BACK DOOR SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The power back door unit assembly (power back door ECU) inputs signals from the latch switch, closer position 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 Code DTC Detection Condition Trouble Area
B2251 While back door closer is operating, malfunction is detected in position information from each switch within specified amount of time

  • Back door lock assembly

  • Harness or connector

  • Power back door unit assembly (power back door ECU)

WIRING DIAGRAM

A0156S7E01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BACK DOOR LOCK)


    1. Check the Data List for proper functioning of each switch Click here.

      Back Door
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Half Latch SW Latch switch signal / ON or OFF

      ON: Latch switch is on

      OFF: Latch switch is off

      		 -
      Courtesy SW Back door courtesy switch signal / ON or OFF

      ON: Back door courtesy switch is on

      OFF: Back door courtesy switch is off

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

    NG

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

    OK

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

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


    1. Remove the back door lock assembly Click here.

    2. Inspect the back door lock assembly Click here.


    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - POWER BACK DOOR UNIT ASSEMBLY [POWER BACK DOOR ECU] AND BODY GROUND)


    1. Disconnect the S22 back door lock assembly connector.

    2. Disconnect the L52 power back door unit assembly (power back door ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S22-5 (CLS) - L52-22 (HAF) Always Below 1 Ω
      S22-3 (CTY) - L52-20 (FUL) Always Below 1 Ω
      S22-4 (E) - Body ground Always Below 1 Ω
      S22-5 (CLS) - Body ground Always 10 kΩ or higher
      S22-3 (CTY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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