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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 >> Back Door cannot be Opened [08/2017 - 08/2019] >> Procedure

Back Door cannot be Opened [08/2017 - 08/2019]: Procedure

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the O30 power back door ECU connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY603281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      O30-8 (IG) - Body ground Ignition switch ON 11 to 14 V
      O30-10 (ECUB) - Body ground Always 11 to 14 V
      O30-12 (B) - Body ground Always 11 to 14 V
    3. Reconnect the power back door ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (BODY GROUND) 
    1. Disconnect the O30 power back door ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY557692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      O30-11 (GND) - Body ground Always Below 1 Ω
    3. Reconnect the power back door ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM 
    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 Open Handle SW Back door opener switch / ON or OFF ON: Back door opener switch is pushed
      OFF: Back door opener switch is not pushed      		 -

      OK

      The back door opener switch functions as specified in the normal condition.

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. INSPECT BACK DOOR LOCK 
    GTY541719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the back door lock (Refer to REMOVAL [08/2015 - ] ).
    2. Apply battery voltage and check operation of the door lock motor.

      Apply Battery Voltage

      Measurement Condition Specified Condition
      Battery positive (+) → Terminal 2 (ACT-)
      Battery negative (-) → Terminal 1 (ACT+)      		 Latch turns to open-latch position
      Battery positive (+) → Terminal 1 (ACT+)
      Battery negative (-) → Terminal 2 (ACT-)      		 Latch turns to full-latch position
    3. 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) Over-latch Below 1 Ω
      5 (CLS) - 3 (E) Open-latch 10 kΩ or higher
      5 (CLS) - 3 (E) Full-latch 10 kΩ or higher
      5 (CLS) - 3 (E) Half-latch 10 kΩ or higher

      Standard Resistance

      Sector Switch

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

      Standard Resistance

      Back Door Courtesy Switch

      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  5

  5. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU AND BACK DOOR ECU) 
    1. Disconnect the V5 back door lock connector.
      GTY544498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the O30, V2 and V3 ECU connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V5-1 (ACT+) - O30-1 (DC-) Always Below 1 Ω
      V5-2 (ACT-) - O30-2 (DC+) Always Below 1 Ω
      V5-5 (CLS) - O30-22 (HAF) Always Below 1 Ω
      V5-4 (FSW) - O30-24 (POS) Always Below 1 Ω
      V5-6 (S) - V3-10 (BDCY) Always Below 1 Ω
      V5-3 (E) - V3-20 (CTYE) Always Below 1 Ω
      V2-17 (OCTY) - O30-20 (FUL) Always Below 1 Ω
      O30-1 (DC-) - Body ground Always 10 kΩ or higher
      O30-2 (DC+) - Body ground Always 10 kΩ or higher
      O30-22 (HAF) - Body ground Always 10 kΩ or higher
      O30-24 (POS) - Body ground Always 10 kΩ or higher
      O30-20 (FUL) - Body ground Always 10 kΩ or higher
    4. Reconnect the back door lock connector.
    5. Reconnect the ECU connectors.
      RESULT

      Result Proceed to
      NG A
      OK B

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    See step  8

  6. INSPECT BACK DOOR OPENER SWITCH 
    1. Remove the back door opener switch (Refer to DISASSEMBLY [08/2015 - 08/2019] ).
      GTY215777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      1 - 2 Back door opener switch free 10 kΩ or higher
      1 - 2 Back door opener switch pushed Below 1 Ω

    Result: 

    NG 

    REPLACE BACK DOOR OPENNER SWITCH. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BACK DOOR ECU) 
    1. Disconnect the V6 switch connector.
      GTY584441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the V3 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V6-1 - V3-15 (HSW+) Always Below 1 Ω
      V6-2 - V3-24 (HSW-) Always Below 1 Ω
      V6-1 or V3-15 (HSW+) - Body ground Always 10 kΩ or higher
      V6-2 or V3-24 (HSW-) - Body ground Always 10 kΩ or higher
    4. Reconnect the switch and ECU connectors.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. REPLACE BACK DOOR ECU 
    1. Temporarily replace the back door ECU with a new or normally functioning one (Refer to DISASSEMBLY [08/2015 - 08/2019] ).

    Result: 

    NEXT 

    See step  9

  9. CHECK BACK DOOR CLOSER SYSTEM (OPERATION) 
    1. Check that the back door closer operates normally.

      Refer to OPERATION CHECK [08/2015 - ]

      OK

      It operates normally.

    Result: 

    OK 

    END (BACK DOOR ECU DEFECTIVE) 

    Result: 

    NG 

    See step  10

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

    Result: 

    NEXT 

    See step  11

  11. CHECK BACK DOOR CLOSER SYSTEM (OPERATION) 
    1. Check that the back door closer operates normally.

      Refer to OPERATION CHECK [08/2015 - ]

      OK

      It operates normally.

    Result: 

    OK 

    END (POWER BACK DOOR DRIVE UNIT [POWER BACK DOOR ECU] DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2017 - 08/2019] 

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