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Home >> Lexus >> 2009 >> LS 460L RWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat >> Climate Control Seat System >> DTC B14F0 Cushion Peltier Temperature Sensor Malfunction >> 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  5

      C:  Go to step  8

      D:  Go to step  11

      A: Go to next step 

  2. READ VALUE USING TECHSTREAM (SEAT CUSHION TEMPERATURE SENSOR) 
    1. Check the Data List for proper functioning of the temperature sensor.

      Front Left Seat A/C 

      DIAGNOSTIC NOTE

      Item Measurement Item/Range Normal Condition Diagnostic Note
      Cushion Temp Seat cushion temperature sensor signal/MIN: 0°C (32°F), MAX: 85°C (185°F) Within range from 0 to 85°C (32 to 185°F) -

      OK: 

      The display is as specified in the normal condition. 

      NG:  Go to step  3

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  3. INSPECT SEAT CLIMATE CONTROL CONTROLLER LH 
    1. Remove the e33 climate control controller connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 (TC5) - 4 (TCS) Outside air temperature 10 to 30°C (50 to 86°F) 1.85 to 0.8 kΩ
      Fig 1: Identifying Seat Climate Control Controller LH Connector Terminals
      G04952611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SEAT CLIMATE CONTROL CONTROLLER LH (See  DISASSEMBLY   ) 

      OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH AND BODY GROUND) 
    1. Disconnect the e34 ECU connector.
    2. Disconnect the e33 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
      e34-19 (TC5) - e33-3 (TC5) Always Below 1 Ω
      e34-16 (TCS) - e33-4 (TCS) Always Below 1 Ω
      634-19 (TC5) - Body ground Always 10 kΩ or higher
      e34-16 (TCS) - Body ground Always 10 kΩ or higher
      Fig 2: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Control Controller LH And Body Ground)
      G04952612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  5. READ VALUE USING TECHSTREAM (SEAT CUSHION TEMPERATURE SENSOR) 
    1. Check the Data List for proper functioning of the temperature sensor.

      Front Right Seat A/C 

      DIAGNOSTIC NOTE

      Item Measurement Item/Range Normal Condition Diagnostic Note
      Cushion Temp Seat cushion temperature sensor signal/MIN: 0°C (32°F), MAX: 85°C (185°F) Within range from 0 to 85°C (32 to 185°F) -

      OK: 

      The display is as specified in the normal condition. 

      NG: Go to step 6 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  6. INSPECT SEAT CLIMATE CONTROL CONTROLLER RH 
    1. Remove the e2 climate control controller connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 (TC5) - 4 (TCS) Outside air temperature 10 to 30°C (50 to 86°F) 1.85 to 0.8 kΩ
      Fig 3: Identifying Seat Climate Control Controller RH Connector Terminals
      G04952613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SEAT CLIMATE CONTROL CONTROLLER RH (See  DISASSEMBLY   ) 

      OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER RH AND BODY GROUND) 
    1. Disconnect the e4 ECU connector.
    2. Disconnect the e2 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
      e4-19 (TC5) - e2-3 (TC5) Always Below 1 Ω
      e4-16 (TCS) - e2-4 (TCS) Always Below 1 Ω
      e4-19 (TC5) - Body ground Always 10 kΩ or higher
      e4-16 (TCS) - Body ground Always 10 kΩ or higher
      Fig 4: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Control Controller RH And Body Ground)
      G06194323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  8. READ VALUE USING TECHSTREAM (SEAT CUSHION TEMPERATURE SENSOR) 
    1. Check the Data List for proper functioning of the temperature sensor.

      Rear Left Seat A/C 

      DIAGNOSTIC NOTE

      Item Measurement Item/Range Normal Condition Diagnostic Note
      Cushion Temp Seat cushion temperature sensor signal/MIN: 0°C (32°F), MAX: 85°C (185°F) Within range from 0 to 85°C (32 to 185°F) -

      OK: 

      The display is as specified in the normal condition. 

      NG: Go to step 9 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

  9. INSPECT REAR SEAT CLIMATE CONTROL CONTROLLER LH 
    1. Remove the p3 climate control controller LH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 (TC5) - 4 (TCS) Outside air temperature 10 to 30°C (50 to 86°F) 1.85 to 0.8 kΩ
      Fig 5: Identifying Rear Seat Climate Control Controller LH Connector Terminals
      G04952615Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE REAR SEAT CLIMATE CONTROL CONTROLLER LH (See  DISASSEMBLY   ) 

      OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (HEATER BLOWER WIRE) 
    1. Disconnect the fp2 joining connector.
    2. Disconnect the p3 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
      fp2-3 (TC 5) - p3-3 (TC5) Always Below 1 Ω
      fp2-4 (TCS) - p3-4 (TCS) Always Below 1 Ω
      fp2-3 (TC5) - Body ground Always 10 kΩ or higher
      fp2-4 (TCS) - Body ground Always 10 kΩ or higher
      Fig 6: Checking Harness And Connector (Heater Blower Wire)
      G04952616Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATER BLOWER WIRE) 

      OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEAT CLIMATE CONTROL ECU - JOINING CONNECTOR) 

  11. READ VALUE USING TECHSTREAM (SEAT CUSHION TEMPERATURE SENSOR) 
    1. Check the Data List for proper functioning of the temperature sensor.

      Rear Right Seat A/C 

      DIAGNOSTIC NOTE

      Item Measurement Item/Range Normal Condition Diagnostic Note
      Cushion Temp Seat cushion temperature sensor signal/MINI: 0°C (32°F), MAX: 85°C (185°F) Within range from 0 to 85°C (32 to 185°F) -

      OK: 

      The display is as specified in the normal condition. 

      Result 

      RESULT CHART

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

      B: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

      C: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

      A: Go to next step 

  12. INSPECT REAR SEAT CLIMATE CONTROL CONTROLLER RH 
    1. Remove the p1 climate control controller connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 (TC5) - 4 (TCS) Outside air temperature 10 to 30°C (50 to 86°F) 1.85 to 0.8 kΩ

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (w/o Ottoman) B
      NG (w/ Ottoman) C
      Fig 7: Identifying Rear Seat Climate Control Controller RH Connector Terminals
      G04952617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      B: REPLACE REAR SEAT CLIMATE CONTROL CONTROLLER RH (See  DISASSEMBLY   ) 

      C: REPLACE SEAT CLIMATE CONTROL CONTROLLER RH (See  DISASSEMBLY   ) 

      A: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (HEATER BLOWER WIRE) 
    1. Disconnect the fp1 joining connector.
    2. Disconnect the p1 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
      fp1-3 (TC5) - p1-3 (TC5) Always Below 1 Ω
      fp1-4 (TCS) - p1-4 (TCS) Always Below 1 Ω
      fp1-3 (TC5) - Body ground Always 10 kΩ or higher
      fp1-4 (TCS) - Body ground Always 10 kΩ or higher
      Fig 8: Checking Harness And Connector (Heater Blower Wire)
      G04952648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATER BLOWER WIRE) 

      OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEAT CLIMATE CONTROL ECU - JOINING CONNECTOR) 

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