BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The power back door drive unit (power back door ECU) inputs signals from the full-latch switch, sector switch and back door courtesy light 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, malfunction is detected in position information from each switch within specified amount of time

  • Back door lock

  • Wire harness

  • Power back door drive unit (Power back door ECU)

WIRING DIAGRAM

A017CK9E05

INSPECTION PROCEDURE

PROCEDURE


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


    1. Check the Data List to determine if the back door courtesy light switch function properly.

      Back door (Power back door ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Courtesy SW Back door courtesy light switch signal / ON or OFF

      ON: Back door is open

      OFF: Back door is closed

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

    NG

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

    OK

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

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

    A017F60E10

    1. Remove the back door lock. Click here

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

      Standard resistance
      Back door courtesy light switch
      Tester Connection Door lock latch Position Specified Condition
      3 (BDCY) - 4 (GND) Open-latch Below 1 Ω
      3 (BDCY) - 4 (GND) Half-latch Below 1 Ω
      3 (BDCY) - 4 (GND) Full-latch 10 kΩ or higher
      3 (BDCY) - 4 (GND) Over-latch 10 kΩ or higher

    NG

    REPLACE BACK DOOR LOCK Click here

    OK

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


    1. A017F0NE06

      Disconnect the T4 door lock connector.

    2. Disconnect the O14 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      T4-3 (BDCY) - O14-20 (FUL) Always Below 1 Ω
      T4-4 (GND) - Body ground Always Below 1 Ω
      T4-3 (BDCY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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