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Home >> Lexus >> 2010 >> IS 250C Standard >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Retractable Hardtop (Diagnostic Codes (B2536-B256E) & Circuit Tests) >> Retractable Hardtop System >> DTC B2538: Abnormal Roof Drive Motor RH Pulse >> Procedure

DTC B2538: Abnormal Roof Drive Motor RH Pulse: Procedure

  1. READ VALUE USING TECHSTREAM (ROOF PULSE/RH VALUE) 
    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 / Retractable Hardtop / Data List.
    5. Read the Data List according to the display on the Techstream.
      RETRACTABLE HARDTOP (SLIDING ROOF CONTROL ECU ASSEMBLY)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Roof Pulse/Rh Value Roof motor RH pulse/Min.: -4000, Max.: 4000 -4000 to 4000 -

      OK

      The Techstream display changes according to condition as shown in the table.

    NG → See step   2 

    OK → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

  2. CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR RH - SLIDING ROOF CONTROL ECU) 
    1. Disconnect the P53 connectors.
      Fig 1: Identifying P56 & P53 Connectors
      GTY285207Courtesy 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
      P56-3 (RPRB) - P53-27 (RPRB) Always Below 1 Ω
      P56-6 (RPR) - P53-14 (RPR) Always Below 1 Ω
      P56-7 (RPRE) - P53-30 (RPRE) Always Below 1 Ω
      P53-27 (RPRB) - P53-30 (RPRE) Always 10 kΩ or higher
      P53-14 (RPR) - P53-30 (RPRE) Always 10 kΩ or higher
      P53-27 (RPRB) - Body ground Always 10 kΩ or higher
      P53-14 (RPR) - Body ground Always 10 kΩ or higher
      P53-30 (RPRE) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Sliding Roof Drive Gear Assembly RH)
      *2 Front view of wire harness connector
      (to Sliding Roof Control ECU Assembly)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT SLIDING ROOF DRIVE GEAR ASSEMBLY RH (ROOF MOTOR RH) 
    1. Disconnect the P56 connector.
      Fig 2: Identifying P56 Connector
      GTY275416Courtesy 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
      P56-3 (RPRB) - Body ground Always 10 kΩ or higher
      P56-6 (RPR) - Body ground Always 10 kΩ or higher
      P56-7 (RPRE) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Component without harness connected
      (Sliding Roof Drive Gear Assembly RH)

    NG → REPLACE SLIDING ROOF DRIVE GEAR ASSEMBLY RH (ROOF MOTOR RH) 

    OK: Go to next step 

  4. CHECK SLIDING ROOF CONTROL ECU ASSEMBLY 
    1. Reconnect the P53 connector.
      Fig 3: Identifying P53 Connector
      GTY268423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the P56 connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P56-3 (RPRB) - P56-7 (RPRE) Always 6 to 10 V
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Sliding Roof Drive Gear Assembly RH)

    NG → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

    OK → REPLACE SLIDING ROOF DRIVE GEAR ASSEMBLY RH (ROOF MOTOR RH) 

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