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Home >> Lexus >> 2008 >> LS 460L >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Climate Control Seat System >> DTC B14F5 Overcurrent Detected in Seat Heater >> Inspection Procedure

Inspection Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      DTC is output (Driver seat climate control ECU) A
      DTC is output (Passenger seat climate control ECU) B
      DTC is output (Rear seat climate control ECU LH) C
      DTC is output (Rear seat climate control ECU RH) D

    B: Go to step  4

    C: Go to step  6

    D: Go to step  8

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - FRONT SEAT CUSHION COVER LH) 
    1. Disconnect the e35 ECU connector.
    2. Disconnect the e42 cushion cover connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      e35-1 (B) - e42-2 (B) Always Below 1 Ω
      e35-1 (B) - Body ground Always 10 kΩ or higher
      e35-5(E) - e42-4 (L) Always Below 1 Ω
      e35-5 (E) - Body ground Always 10 kΩ or higher
      e35-1 (B) - e35-5(E) Always 10 kΩ or higher
      Fig 1: Identifying e35 ECU And e42 Cushion Cover Connector Terminals
      G04952657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK SEAT CLIMATE CONTROL ECU (OPERATION) 
    1. Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.

      OK: DTC is not output 

    NG: REPLACE FRONT SEAT CUSHION COVER LH  (See REMOVAL  )

    OK: REPLACE SEAT CLIMATE CONTROL ECU  (See REMOVAL  )

  4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - FRONT SEAT CUSHION COVER RH) 
    1. Disconnect the e3 ECU connector.
    2. Disconnect the e9 cushion cover connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      e3-1 (B) - e9-2 (B) Always Below 1 Ω
      e3-1 (B) - Body ground Always 10 kΩ or higher
      e3-5 (E) - e9-4 (L) Always Below 1 Ω
      63-5 (E) - Body ground Always 10 kΩ or higher
      e3-1 (B) - e3-5 (E) Always 10 kΩ or higher
      Fig 2: Identifying e3 ECU And e9 Cushion Cover Connector Terminals
      G04952658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK SEAT CLIMATE CONTROL ECU (OPERATION) 
    1. Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.

      OK: DTC is not output 

    NG: REPLACE FRONT SEAT CUSHION COVER RH  (See REMOVAL  )

    OK: REPLACE SEAT CLIMATE CONTROL ECU  (See REMOVAL  )

  6. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER LH) 
    1. Disconnect the f27 ECU connector.
    2. Disconnect the f23 seatback cover connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      f27-1 (B) - f23-1 (B) Always Below 1 Ω
      f27-1 (B) - Body ground Always 10 kΩ or higher
      f27-5 (E) - f23-3 (L) Always Below 1 Ω
      f27-5 (E) - Body ground Always 10 kΩ or higher
      f27-1 (B) - f27-5 (E) Always 10 kΩ or higher
      Fig 3: Identifying f27 ECU And f23 Seatback Cover Connector Terminals
      G04952659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK SEAT CLIMATE CONTROL ECU (OPERATION) 
    1. Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.

      OK: DTC is not output 

    NG: REPLACE REAR SEATBACK COVER LH  (See DISASSEMBLY  )

    OK: REPLACE SEAT CLIMATE CONTROL ECU  (See DISASSEMBLY  )

  8. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER RH) 
    1. Disconnect the f7 ECU connector.
    2. Disconnect the f3 seatback cover connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      f7-1 (B) - f3-1 (B) Always Below 1 Ω
      f7-1 (B) - Body ground Always 10 kΩ or higher
      f7-5 (E) - f3-3 (L) Always Below 1 Ω
      f7-5 (E) - Body ground Always 10 kΩ or higher
      f7-1 (B) - f7-5 (E) Always 10 kΩ or higher
      Fig 4: Identifying f7 ECU And f3 Seatback Cover Connector Terminals
      G04952660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK SEAT CLIMATE CONTROL ECU (OPERATION) 
    1. Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.

      OK: DTC is not output 

      Result 

      RESULT CHART

      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG (w/o Ottoman) C
      NG (w/ Ottoman) D

    B: REPLACE SEAT CLIMATE CONTROL ECU  (See DISASSEMBLY  )

    C: REPLACE REAR SEATBACK COVER RH  (See DISASSEMBLY  )

    D: REPLACE REAR SEATBACK COVER RH  (See DISASSEMBLY  )

    A: REPLACE SEAT CLIMATE CONTROL ECU  (See DISASSEMBLY  )

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