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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Back Door Closer System - Diagnostic Codes & Symptom Tests >> Back Door Closer System >> DTC B2251: Back Door Closer Switch Malfunction [08/2015 - 08/2019] >> Procedure

DTC B2251: Back Door Closer Switch Malfunction [08/2015 - 08/2019]: Procedure

  1. READ VALUE USING TECHSTREAM (HALF LATCH SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Back Door / Data List /
    5. According to the display on the Techstream, read the Data List.
      BACK DOOR (POWER BACK DOOR ECU)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Half Latch SW Latch switch signal / ON or OFF ON: Back door lock motor is open-latch or over-latch
      OFF: Back door lock motor is full-latch or half-latch      		 -

      OK

      The display is as specified in the normal condition.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (BACK DOOR COURTESY LIGHT SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Back Door / Data List /
    5. According to the display on the Techstream, read the Data List.
      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.

    Result: 

    OK 

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

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR ECU - POWER BACK DOOR ECU) 
    1. Disconnect the V2 back door ECU connector.
      GTY565185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the O30 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
      V2-17 (OCTY) - O30-20 (FUL) Always Below 1 Ω
      V2-17 (OCTY) or O30-20 (FUL) - Body ground Always 10 kΩ or higher
    4. Reconnect the back door ECU connector.
    5. Reconnect the power back door ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING BACK DOOR ECU (BACK DOOR COURTESY LIGHT SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Back Door P/W / Data List /
    5. According to the display on the Techstream, read the Data List.
      BACK DOOR P/W (BACK DOOR ECU)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door 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.

    Result: 

    OK 

    REPLACE BACK DOOR ECU 

    (Refer to DISASSEMBLY [08/2015 - 08/2019] )

    Result: 

    NG 

    See step  5

  5. INSPECT BACK DOOR LOCK (BACK DOOR COURTESY LIGHT SWITCH) 
    GTY541716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the back door lock (Refer to REMOVAL [08/2015 - ] ).
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Door Lock Latch Position Specified Condition
      6 (S) - 3 (E) Open-latch Below 1 Ω
      6 (S) - 3 (E) Half-latch Below 1 Ω
      6 (S) - 3 (E) Full-latch 10 kΩ or higher
      6 (S) - 3 (E) Over-latch 10 kΩ or higher

    Result: 

    NG 

    REPLACE BACK DOOR LOCK 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - BACK DOOR ECU AND BODY GROUND) 
    1. Disconnect the V5 door lock connector.
      GTY589422Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the V2 and V3 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V5-6 (S) - V3-10 (BDCY) Always Below 1 Ω
      V5-3 (E) - V3-20 (CTYE) Always Below 1 Ω
      V2-6 (GND) - Body ground Always Below 1 Ω
      V5-6 (S) or V3-10 (BDCY) - Body ground Always 10 kΩ or higher
    4. Reconnect the door lock and ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. REPLACE POWER BACK DOOR DRIVE UNIT 
    1. Temporarily replace the power back door drive unit with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).

    Result: 

    NEXT 

    See step  8

  8. CLEAR DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

    Result: 

    NEXT 

    See step  9

  9. CHECK DTC OUTPUT 
    1. Check the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC not output B2251.

    Result: 

    OK 

    END (POWER BACK DOOR DRIVE UNIT DEFECTIVE) 

    Result: 

    NG 

    REPLACE BACK DOOR ECU 

    (Refer to DISASSEMBLY [08/2015 - 08/2019] )

  10. INSPECT BACK DOOR LOCK (LATCH SWITCH) 
    GTY541717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the back door lock (Refer to REMOVAL [08/2015 - ] ).
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Latch Switch

      Tester Connection Door Lock Latch Position Specified Condition
      5 (CLS) - 3 (E) Open-latch Below 1 Ω
      5 (CLS) - 3 (E) Half-latch 10 kΩ or higher
      5 (CLS) - 3 (E) Full-latch 10 kΩ or higher
      5 (CLS) - 3 (E) Over-latch Below 1 Ω

    Result: 

    NG 

    REPLACE BACK DOOR LOCK 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the V5 door lock connector.
      GTY598822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the O30, V2 and V3 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V5-3 (E) - V3-20 (CTYE) Always Below 1 Ω
      V5-5 (CLS) - O30-22 (HAF) Always Below 1 Ω
      V2-6 (GND) - Body ground Always Below 1 Ω
      V5-5 (CLS) or O30-22 (HAF) - Body ground Always 10 kΩ or higher
    4. Reconnect the door lock and ECU connector.

    Result: 

    OK 

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

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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