POWER BACK DOOR SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The power back door unit (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. Based on these switch signals, the latch position of the back door lock 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

  • Harness or connector

  • Power back door unit

WIRING DIAGRAM

A01ES5FE01

INSPECTION PROCEDURE

PROCEDURE


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


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

      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 Click here

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

    A01ERWEE04

    1. Remove the back door lock Click here.

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

      Standard Resistance
      Latch Switch
      Tester Connection Condition Specified Condition
      5 (CLS) - 4 (E) Over-latch Below 1 Ω
      5 (CLS) - 4 (E) Full-latch 10 kΩ or higher
      5 (CLS) - 4 (E) Half-latch 10 kΩ or higher
      5 (CLS) - 4 (E) Open-latch 10 kΩ or higher
      Back Door Courtesy Switch
      Tester Connection Condition Specified Condition
      3 (CTY) - 4 (E) Over-latch 10 kΩ or higher
      3 (CTY) - 4 (E) Full-latch 10 kΩ or higher
      3 (CTY) - 4 (E) Half-latch Below 1 Ω
      3 (CTY) - 4 (E) Open-latch Below 1 Ω

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (LOCK - UNIT AND BODY GROUND)

    A01EQR6E09

    1. Disconnect the S19 door lock connector.

    2. Disconnect the L36 unit connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S19-5 (CLS) - L36-22 (HAF) Always Below 1 Ω
      S19-3 (CTY) - L36-20 (FUL) Always Below 1 Ω
      S19-4 (E) - Body ground Always Below 1 Ω
      S19-5 (CLS) - Body ground Always 10 kΩ or higher
      S19-3 (CTY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER BACK DOOR UNIT ASSEMBLY Click here