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Climate Control Seat System does not Operate: Procedure

WARNING: This page is about a different car, the 2009 Lexus GS 460 and 2009 Lexus GS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. SYSTEM CHECK 
    1. Check the climate control seat operation.

      Result

      Result Proceed to
      Climate control seat does not operate (Front LH) A
      Climate control seat does not operate (Front RH) B
      Both climate control seats do not operate C

    C → See step   18 

    B → See step   10 

    A: Go to next step 

  2. SYSTEM CHECK 
    1. Check the climate control operation again.

      Result

      Result Proceed to
      Only seat back climate control blower LH does not operate A
      Both climate control blower do not operate B

    B → See step   5 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the b14 connector.
      Fig 1: Identifying B14 Connector
      GTY104411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      b14-2 (IG) - b14-1 (GND) Engine switch on (IG)
      Blower switch ON (Vol: 1 to 3)      		 6.7 to 9.3 V

    NG → See step   4 

    OK → See step   20 

  4. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the b11 connector.
      Fig 2: Identifying B11 & B14 Connectors
      GTY104172Courtesy 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
      b14-2 (IG) - b11-2 (CTB) Always Below 1 Ω
      b14-2 (IG) - Body ground Always Below 1 Ω
      b14-1 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   21 

  5. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the b11 connector.
      Fig 3: Identifying B11 Connector
      GTY101758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage and Resistance

      Tester Connection Condition Specified Condition
      b11-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      b11-4 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the b11 connector.
      Fig 4: Identifying B11 Connector
      GTY102104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the input signal waveform.
      1. Connect the oscilloscope to terminal 3 and body ground with the climate control blower LH connector still connected.
      2. Check the signal waveform according to the condition(s) in the table below.
        Terminal No. b11-3 (SIGN) - Body ground
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition Engine switch on (IG), seat hater switch ON

    NG → See step   7 

    OK → See step   22 

  7. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the b11 and K51 connectors.
      Fig 5: Identifying B11 & K51 Connectors
      GTY101921Courtesy 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
      b11-3 (SIGN) - J59-16 (LOUT) Always Below 1 Ω
      b11-3 (SIGN) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. INSPECT SEAT HEATER SWITCH 
    1. Remove the seat heater switch.
      Fig 6: Identifying Seat Heater Switch Connector
      GTY100569Courtesy 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
      K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kΩ or higher
      K40-7 (BLLH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kΩ
      K40-7 (BLLH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 Ω

    NG → REPLACE SEAT HEATER SWITCH 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 7: Identifying K40 & K51 Connector
      GTY100598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      K40-7(BLLH) - K51-2 (SW 5) Always Below 1 Ω
      K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 Ω
      K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 Ω
      K40-12 (E) - Body ground Always Below 1 Ω
      K40-7 (BLLH) - Body ground Always 10 kΩ or higher
      K40-8 (SVS5) - Body ground Always 10 kΩ or higher
      K40-10 (SVSG) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   23 

  10. SYSTEM CHECK 
    1. Check the climate control operation again.

      Result

      Result Proceed to
      Only seat back climate control blower RH does not operate A
      Both climate control blower do not operate B

    B → See step   13 

    A: Go to next step 

  11. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the a14 connector.
    2. Measure the voltage according to the value(s) in the table below.
      Fig 8: Identifying A14 Connector
      GTY103430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      a14-2 (IG) - a14-1 (GND) Engine switch on (IG)
      Blower switch ON (Vol: 1 to 3)      		 6.7 to 9.3 V

    NG → See step   12 

    OK → See step   24 

  12. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the a11 connector.
      Fig 9: Identifying A11 & A14 Connector
      GTY102246Courtesy 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
      a14-2 (IG) - a11-2 (CTB) Always Below 1 Ω
      a14-2 (IG) - Body ground Always Below 1 Ω
      a14-1 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   25 

  13. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the a11 connector.
      Fig 10: Identifying A11 Connector
      GTY101757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage and Resistance

      Tester Connection Condition Specified Condition
      a11-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      a11-4 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  14. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the a11 connector.
      Fig 11: Identifying A11 Connector
      GTY102105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the input signal waveform.
      1. Connect the oscilloscope to terminal 3 and body ground with the climate control blower RH connector still connected.
      2. Check the signal waveform according to the condition(s) in the table below.
        Terminal No. a11-3 (SIGN) - Body ground
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition Engine switch on (IG), seat hater switch ON

    NG → See step   15 

    OK → See step   26 

  15. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the a11 and K51 connectors.
      Fig 12: Identifying A11 & K51 Connectors
      GTY101920Courtesy 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
      a11-3 (SIGN) - J59-8 (ROUT) Always Below 1 Ω
      a11-3 (SIGN) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  16. INSPECT SEAT HEATER SWITCH 
    1. Remove the seat heater switch.
      Fig 13: Identifying Seat Heater Switch Connector
      GTY100568Courtesy 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
      K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kΩ
      K40-9 (BLRH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kΩ
      K40-9 (BLRH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 Ω

    NG → REPLACE SEAT HEATER SWITCH 

    OK: Go to next step 

  17. CHECK HARNESS AND CONNECTOR 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 14: Identifying K40 & K51 Connectors
      GTY100601Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      K40-9(BLRH) - K51-3 (SW 4) Always Below 1 Ω
      K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 Ω
      K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 Ω
      K40-12 (E) - Body ground Always Below 1 Ω
      K40-9 (BLRH) - Body ground Always 10 kΩ or higher
      K40-8 (SVS5) - Body ground Always 10 kΩ or higher
      K40-10 (SVSG) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   27 

  18. INSPECT SEAT HEATER SWITCH 
    1. Remove the seat heater switch.
      Fig 15: Identifying Seat Heater Switch Connector
      GTY103819Courtesy 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
      K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kΩ
      K40-9 (BLRH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kΩ
      K40-9 (BLRH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 Ω
      K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kΩ
      K40-7 (BLLH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kΩ
      K40-7 (BLLH) - K40-10 (SVSG) Blower switch ON (Vol. 3) Below 111 Ω

    NG → REPLACE SEAT HEATER SWITCH 

    OK: Go to next step 

  19. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the K51 connector.
      Fig 16: Identifying K40 & K51
      GTY100603Courtesy 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
      K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 Ω
      K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 Ω
      K40-8 (SVS5) - Body ground Always 10 kΩ or higher
      K40-10 (SVSG) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   28 

  20. REPLACE SEAT BACK CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY - Step 23 
  21. REPLACE SEAT CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY - Step 25 
  22. REPLACE SEAT CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY - Step 25 
  23. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  24. REPLACE SEAT BACK CLIMATE CONTROL BLOWER RH. Refer to  DISASSEMBLY - Step 23 
  25. REPLACE SEAT CLIMATE CONTROL BLOWER RH. Refer to  DISASSEMBLY - Step 25 
  26. REPLACE SEAT CLIMATE CONTROL BLOWER RH. Refer to  DISASSEMBLY - Step 25 
  27. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  28. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
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