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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 B2540: Abnormal Difference Between RH and LH Roof Drive Motor Pulse >> Procedure

DTC B2540: Abnormal Difference Between RH and LH Roof Drive Motor Pulse: Procedure

  1. READ VALUE USING TECHSTREAM (ROOF PULSE/RH VALUE, ROOF PULSE/LH 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 -
      Roof Pulse/Lh Value Roof motor LH 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 P56 and 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. CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR LH - SLIDING ROOF CONTROL ECU) 
    1. Disconnect the Q45 and Q35 connectors.
      Fig 2: Identifying Q45 & Q35 Connectors
      GTY284801Courtesy 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
      Q40-3 (RPLB) - Q35-25 (RPLB) Always Below 1 Ω
      Q40-6 (RPL) - Q35-24 (RPL) Always Below 1 Ω
      Q40-7 (RPLE) - Q35-22 (RPLE) Always Below 1 Ω
      Q35-25 (RPLB) - Q35-22 (RPLE) Always 10 kΩ or higher
      Q35-24 (RPL) - Q35-22 (RPLE) Always 10 kΩ or higher
      Q35-25 (RPLB) - Body ground Always 10 kΩ or higher
      Q35-24 (RPL) - Body ground Always 10 kΩ or higher
      Q35-22 (RPLE) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

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