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Sliding Roof ECU Power Source Circuit: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 350 and 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (SLIDING ROOF OPERATION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Perform the Active Test according to the display on the Techstream.

      Slide Roof

      Tester Display Test Part Control Range Diagnostic Note
      Slide Roof Operate sliding roof CLOS/UP / OFF -
      Slide Roof Operate sliding roof OPN/DWN / OFF -

      OK 

      Sliding roof operates normally.

    NG → See step   2 

    OK → See step   6 

  2. INSPECT FUSE (S/ROOF, ECU-IG LH) 
    1. Remove the S/ROOF fuse from the cowl side J/B LH.
    2. Remove the ECU-IG LH fuse from the cowl side J/B LH.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Fuse Condition Specified Condition
      S/ROOF Always Below 1 Ω
      ECU-IG LH Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. CHECK SLIDING ROOF ECU (POWER SOURCE) 
    1. Disconnect the R6 sliding roof ECU connector.
      Fig 1: Identifying R6 Sliding Roof ECU Connector Terminals
      GTY141869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      R6-5 (B) - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK SLIDING ROOF ECU (POWER SOURCE) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying Sliding Roof ECU Connector View
      GTY125577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      R6-6 (IG) - Body ground Always 10 to 14 V

    NG → See step   8 

    OK: Go to next step 

  5. CHECK SLIDING ROOF ECU (GROUND) 
    1. Disconnect the R6 sliding roof ECU connector.
      Fig 3: Identifying R6 Sliding Roof ECU Connector Terminals
      GTY120694Courtesy 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
      R6-7 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE  
  7. REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (SLIDING ROOF ECU). Refer to  REMOVAL 
  8. INSPECT MAP LIGHT ASSEMBLY (SLIDING ROOF SWITCH ASSEMBLY) 
    1. Remove the map light assembly (sliding roof switch assembly).
      Fig 4: Identifying Map Light Assembly & Map Light Assembly Connector View
      GTY143199Courtesy 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
      R5-21 (IG) - R5-24 (IG3) Always Below 1 Ω
      R5-21 (IG) - Body ground Always 10 kΩ or higher

    NG → REPLACE MAP LIGHT ASSEMBLY (SLIDING ROOF SWITCH ASSEMBLY) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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