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Home >> Toyota >> 2008 >> Highlander Base, FWD >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> (Door / Hatch) (Except Hybrid) >> Back Door Closer System >> Back Door Cannot Be Opened >> Inspection Procedure

Inspection Procedure

  1. READ VALUE ON TECHSTREAM 
    1. Check the Data List to determine if the back door lock function properly.

      Back Door (Power back door ECU) 

      DIAGNOSTIC NOTE TABLE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Door Lock Status Back door lock condition signal / LOCK or UNLOCK LOCK Back door is locked
      UNLOCK Back door is unlocked      		 -

      OK: The back door functions as specified in the normal condition. 

    NG:  Go to step  7

    OK: Go to next step 

  2. READ VALUE ON TECHSTREAM 
    1. Check the Data List to determine if the back door handle switch function properly.

      Main body ECU (Instrument panel junction block) 

      DIAGNOSTIC NOTE TABLE

      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. 

    NG:  Go to step  5

    OK: Go to next step 

  3. INSPECT BACK DOOR LOCK 
    1. Remove the back door lock (See REMOVAL ).
      Fig 1: Identifying Back Door Lock
      G05420307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Apply battery voltage and check operation of the door lock motor.

      OK 

      MEASUREMENT SPECIFIED CONDITION TABLE

      Measurement Condition Specified Condition
      Battery positive (+) → Terminal 1 (DC+)
      Battery negative (-) → Terminal 2 (DC-)      		 Latch turns to full-latch position
      Battery positive (+) → Terminal 2 (DC-)
      Battery negative (-) → Terminal 1 (DC+)      		 Latch turns to open-latch position
    3. Measure the resistance of the switch.

      Standard resistance: Full-latch switch 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

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

      Sector switch 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

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

      Back door courtesy light switch 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      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  (See REMOVAL )

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU) 
    1. Disconnect the T4 back door lock connector.
    2. Disconnect the O15 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      T4-1 (DC+) - O15-2 (DC+) Always Below 1 Ω
      T4-2 (DC-) - O15-1 (DC-) Always Below 1 Ω
      T4-5 (HAF) - O15-22 (HAF) Always Below 1 Ω
      T4-6 (POS) - O15-24 (POS) Always Below 1 Ω
      T4-3 (BDCY) - O15-20 (FUL) Always Below 1 Ω
      T4-4 (GND) - Body ground Always Below 1 Ω
      T4-1 (DC+) - Body ground Always 10 kΩ or higher
      T4-2 (DC-) - Body ground Always 10 kΩ or higher
      T4-5 (HAF) - Body ground Always 10 kΩ or higher
      T4-6 (POS) - Body ground Always 10 kΩ or higher
      T4-3 (BDCY) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying Harness & Connector (Back Door Lock - Power Back Door ECU)
      G05422023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)  (See REMOVAL  )

  5. INSPECT BACK DOOR OPENER SWITCH 
    1. Remove the back door opener switch (See REMOVAL  ).
      Fig 3: Identifying Back Door Opener Switch
      G05422027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Switch Position Specified Condition
      2 - 3 Back door opener switch not pushed (OFF) 10 kΩ or higher
      2 - 3 Back door opener switch pushed (ON) Below 1 Ω

    NG: REPLACE BACK DOOR OPEN SWITCH 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - MAIN BODY ECU) 
    1. Disconnect the H1 switch connector.
    2. Disconnect the D8 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      H1-3 (BDSU) - D8-26 (BDSU) Always Below 1 Ω
      H1-2 (L) - Body ground Always Below 1 Ω
      H1-3 (BDSU) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying Harness & Connector (Back Door Opener Switch - Main Body ECU)
      G05422028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

  7. REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) 
    1. Replace the power back door drive unit (power back door ECU) (See REMOVAL  ).
  8. CHECK POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) 
    1. Check that the back door closer operates normally.

      OK: It operates normally. 

    NG: REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

    OK: END (REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) DEFECTIVE) 

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