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Home >> Lexus >> 2010 >> RX 350 FWD >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Back Door Closer (Diagnostic Codes & Symptom Tests) >> Back Door Closer System >> Back Door cannot be Opened (From 8/2009) >> Procedure

Back Door cannot be Opened (From 8/2009): Procedure

  1. CHECK POWER DOOR LOCK OPERATION (BASIC FUNCTION) 
    1. Check the power door lock basic function. Refer to OPERATION CHECK .

      OK

      The power door lock basic function can be operated normally.

    NG → See step   14 

    OK: Go to next step 

  2. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Data List.
    5. Check if the back door lock functions properly.
      MAIN BODY (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door Open Back door lock/Permit or Prohibit Permit: Back door unlocked
      Prohibit: Back door locked      		 -

      OK

      The back door functions as specified in the normal condition column.

    NG → See step   11 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Back Door / Data List.
    5. Check if the back door lock functions properly.
      BACK DOOR (POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT))

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

      OK

      The back door functions as specified in the normal condition column.

    NG → See step   15 

    OK: Go to next step 

  4. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Smart Access / Data List.
    5. Check if the switch functions properly.
      SMART ACCESS (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tr/B-Door Unlock SW Back door opener switch/ON or OFF ON: Back door opener switch pushed
      OFF: Back door opener switch not pushed      		 -

      OK

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

    NG → See step   9 

    OK: Go to next step 

  5. INSPECT BACK DOOR LOCK ASSEMBLY 
    1. Remove the back door lock assembly. Refer to REMOVAL .
    2. Check the operation of the back door closer motor.
      Fig 1: Identifying back door closer motor
      GTY281190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Apply battery voltage and check the operation of the door lock motor.

        OK

        Measurement Condition Specified Condition
        Battery positive (+) → 1 (M+)
        Battery negative (-) → 4 (M-)        		 Latch turns to full-latch position (clockwise rotation)
        Battery positive (+) → 4 (M-)
        Battery negative (-) → 1 (M+)        		 Latch turns to open-latch position (counterclockwise rotation)
        TEXT IN ILLUSTRATION

        *1 Component without harness connected
        (Back Door Lock Assembly)
        *2 Counterclockwise
        *3 Clockwise
    3. Check operation of the latch switch.
      Fig 2: Identifying latch switch
      GTY262812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        CLOSE OPERATION

        Measurement Condition Condition Specified Condition
        3 (ULSW) - 7 (E) Open-latch Below 1 Ω
        3 (ULSW) - 7 (E) Open-latch → Half-latch Below 1 Ω → 10 kΩ or higher
        3 (ULSW) - 7 (E) Half-latch 10 kΩ or higher
        3 (ULSW) - 7 (E) Full-latch 10 kΩ or higher
        3 (ULSW) - 7 (E) Over stroke 10 kΩ or higher → Below 1 Ω → 10 kΩ or higher
        OPEN OPERATION

        Measurement Condition Condition Specified Condition
        3 (ULSW) - 7 (E) Full-latch 10 kΩ or higher
        3 (ULSW) - 7 (E) Half-latch 10 kΩ or higher
        3 (ULSW) - 7 (E) Half-latch → Open-latch 10 kΩ or higher → Below 1 Ω
        3 (ULSW) - 7 (E) Open-latch Below 1 Ω
    4. Check the operation of the pawl switch.
      Fig 3: Identifying pawl switch
      GTY260170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        CLOSE OPERATION

        Measurement Condition Condition Specified Condition
        2 (FSW) - 7 (E) Open-latch 10 kΩ or higher
        2 (FSW) - 7 (E) Open-latch → Half-latch 10 kΩ or higher → Below 1 Ω → 10 kΩ or higher
        2 (FSW) - 7 (E) Half-latch 10 kΩ or higher
        2 (FSW) - 7 (E) Half-latch → Full-latch 10 kΩ or higher → Below 1 Ω → 10 kΩ or higher
        2 (FSW) - 7 (E) Full-latch 10 kΩ or higher
    5. Check the operation of the back door courtesy switch.
      Fig 4: Identifying back door courtesy switch
      GTY263229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        8 (CTY) - 7 (E) Open-latch Below 1 Ω
        8 (CTY) - 7 (E) Half-latch Below 1 Ω
        8 (CTY) - 7 (E) Full-latch 10 kΩ or higher
    6. Check the operation of the sector switch.
      Fig 5: Identifying sector switch
      GTY255989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        6 (DLSW) - 7 (E) Sector gear in neutral position (sector switch on) Below 1 Ω
        6 (DLSW) - 7 (E) Sector gear not in neutral position (sector switch off) 10 kΩ or higher
        TEXT IN ILLUSTRATION

        *1 Component without harness connected
        (Back Door Lock Assembly)        		 *2 Sector Switch
        *3 Sector Gear - -

    NG → See step   12 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - POWER BACK DOOR ECU) 
    1. Disconnect the Y10 back door lock connector and P33 ECU connector.
      Fig 6: Identifying Y10 back door lock and P33 ECU connector
      GTY253854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y10-1 (M+) - P33-2 (DC+) Always Below 1 Ω
      Y10-4 (M-) - P33-1 (DC-) Always Below 1 Ω
      Y10-3 (ULSW) - P33-22 (HAF) Always Below 1 Ω
      Y10-6 (DLSW) - P33-24 (POS) Always Below 1 Ω
      Y10-8 (CTY) - P33-20 (FUL) Always Below 1 Ω
      Y10-2 (FSW) - P33-16 (PAWL) Always Below 1 Ω
      Y10-7 (E) - Body ground Always Below 1 Ω
      Y10-1 (M+) - Body ground Always 10 kΩ or higher
      Y10-4 (M-) - Body ground Always 10 kΩ or higher
      Y10-3 (ULSW) - Body ground Always 10 kΩ or higher
      Y10-6 (DLSW) - Body ground Always 10 kΩ or higher
      Y10-8 (CTY) - Body ground Always 10 kΩ or higher
      Y10-2 (FSW) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Back Door Lock Assembly)
      *2 Front view of wire harness connector
      (to Power Back Door ECU (Power Back Door Motor Unit))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) 
    1. Replace the power back door ECU (power back door motor unit). Refer to REMOVAL .

    NEXT: Go to next step 

  8. CHECK BACK DOOR OPEN FUNCTION 
    1. Check that the back door can be opened.

      OK

      The back door can be opened normally.

    NG → See step   17 

    OK → END (POWER BACK DOOR ECU WAS DEFECTIVE) 

  9. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY 
    1. Remove the back door opener switch assembly. Refer to REMOVAL .
      Fig 7: Measure the resistance
      GTY255529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (E) - 3 (UL) Back door opener switch not pushed 10 kΩ or higher
      2 (E) - 3 (UL) Back door opener switch pushed Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Component without harness connected
      (Back Door Opener Switch Assembly)

    NG → See step   13 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU) 
    1. Disconnect the Y11 switch connector and F58 ECU connector.
      Fig 8: Identifying Y11 switch and F58 ECU connector
      GTY269144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Y11-3 (UL) - F58-22 (TSW5) Always Below 1 Ω
      Y11-2 (E) - Body ground Always Below 1 Ω
      Y11-3 (UL) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Back Door Opener Switch Assembly)
      *2 Front view of wire harness connector
      (to Certification ECU (Smart Key ECU Assembly))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   17 

  11. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL 
  12. REPLACE BACK DOOR LOCK ASSEMBLY. Refer to  REMOVAL 
  13. REPLACE BACK DOOR OPENER SWITCH ASSEMBLY. Refer to  REMOVAL 
  14. GO TO POWER DOOR LOCK CONTROL SYSTEM. Refer to  PROBLEM SYMPTOMS TABLE 
  15. REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT) 
    1. Replace the power back door ECU (power back door motor unit). Refer to REMOVAL .

    NEXT: Go to next step 

  16. CHECK BACK DOOR OPEN FUNCTION 
    1. Check that the back door can be opened. Refer to OPERATION CHECK .

      OK

      The back door can be opened normally.

    NG → See step   11 

    OK → END (POWER BACK DOOR ECU WAS DEFECTIVE) 

  17. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL 
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