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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat >> Climate Control Seat System >> DTC B14F4 Overcurrent Detected in Seatback Peltier >> Inspection Procedure

Inspection Procedure

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

      Result 

      RESULT CHART

      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 - SEAT CLIMATE CONTROL CONTROLLER LH) 
    1. Disconnect the e34 ECU connector.
    2. Disconnect the e51 climate control controller connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      e34-10 (TDB+) - e51-1 (TDB+) Always Below 1 Ω
      e34-10 (TDB+) - Body ground Always 10 kΩ or higher
      e34-9 (TDB-) - e51-2 (TDB-) Always Below 1 Ω
      e34-9 (TDB-) - Body ground Always 10 kΩ or higher
      634-10 (TDB+) - e34-9 (TDB-) Always 10 kΩ or higher
      Fig 1: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Control Controller LH)
      G04952651Courtesy 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 SEAT CLIMATE CONTROL CONTROLLER LH (See  DISASSEMBLY   ) 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER RH) 
    1. Disconnect the e4 ECU connector.
    2. Disconnect the e21 climate control controller connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      e4-10 (TDB+) - e21-1 (TDB+) Always Below 1 Ω
      e4-10 (TDB+) - Body ground Always 10 kΩ or higher
      e4-9 (TDB-) - e21-2 (TDB-) Always Below 1 Ω
      e4-9 (TDB-) - Body ground Always 10 kΩ or higher
      e4-10 (TDB+) - e4-9 (TDB-) Always 10 kΩ or higher
      Fig 2: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Control Controller RH)
      G06194361Courtesy 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 SEAT CLIMATE CONTROL CONTROLLER RH (See  DISASSEMBLY   ) 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  6. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH) 
    1. Disconnect the f.28 ECU connector.
    2. Disconnect the f32 climate control blower connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      f28-10 (TDB+) - f32-1 (TDB+) Always Below 1 Ω
      f28-10 (TDB+) - Body ground Always 10 kΩ or higher
      f28-9 (TDB-) - f32-2 (TDB-) Always Below 1 Ω
      f28-9 (TDB-) - Body ground Always 10 kΩ or higher
      f28-10 (TDB+) - f32-9 (TDB-) Always 10 kΩ or higher
      Fig 3: Checking Harness And Connector (Seat Climate Control ECU - Rear Seatback Climate Control Blower LH)
      G04952653Courtesy 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 CLIMATE CONTROL BLOWER LH (See  DISASSEMBLY   ) 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  8. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER RH) 
    1. Disconnect the f8 ECU connector.
    2. Disconnect the f12 climate control blower connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      f8-10 (TDB+) - f12-1 (TDB+) Always Below 1 Ω
      f8-10 (TDB+) - Body ground Always 10 kΩ or higher
      f8-9 (TDB-) - f12-2 (TDB-) Always Below 1 Ω
      f8-9 (TDB-) - Body ground Always 10 kΩ or higher
      f8-10 (TDB+) - f12-9 (TDB-) Always 10 kΩ or higher
      Fig 4: Checking Harness And Connector (Seat Climate Control ECU - Rear Seatback Climate Control Blower RH)
      G04952654Courtesy 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 CLIMATE CONTROL BLOWER RH (See  DISASSEMBLY   ) 

      D: REPLACE REAR SEATBACK CLIMATE CONTROL BLOWER RH (See  DISASSEMBLY   ) 

      A: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

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