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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Body & Frame >> Seats >> Climate Control Seat System - Diagnostics & Symptom Tests >> Climate Control Seat System >> Climate Control Seat System does not Operate [11/2023 - ] >> Procedure

Climate Control Seat System does not Operate [11/2023 - ]: Procedure

  1. CHECK CLIMATE CONTROL SEAT OPERATION 
    1. Check the climate control seat operation.

      Refer to ON-VEHICLE INSPECTION [12/2019 - ] 

      Result

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

    Result: 

    B 

    See step  13

    Result: 

    C 

    See step  24

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Left Seat Blower Front LH seat blower operation OFF or ON -

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Front Left Seat Blower

      Result

      Result Proceed to
      Both front LH seat cushion blower and front LH seatback blower operate A
      Only front LH seatback blower does not operate B
      Only front LH seat cushion blower does not operate C
      Both front LH seat cushion blower and front LH seatback blower do not operate D

    Result: 

    A 

    GO TO AIR CONDITIONING SYSTEM 

    For HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

    For Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

    Result: 

    C 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2023 - ] 

    Result: 

    D 

    See step  6

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - SEATBACK CLIMATE CONTROL BLOWER LH) 
    1. Disconnect the g3 seatback climate control blower LH connector.
    2. Disconnect the e20 seat cushion climate control blower assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      g3-1 (IG) - e20-5 (CTB) Always Below 1 Ω
      g3-1 (IG) or e20-5 (CTB) - Body ground Always 10 kΩ or higher
      g3-3 (BFB+) - e20-6 (BBS) Always Below 1 Ω
      g3-3 (BFB+) or e20-6 (BBS) - Body ground Always 10 kΩ or higher
      g3-4 (GND) - e20-4 (BFB-) Always Below 1 Ω
      g3-4 (GND) or e20-4 (BFB-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. REPLACE SEATBACK CLIMATE CONTROL BLOWER LH 
    1. Temporarily replace the seatback climate control blower LH with a new or known good one.

      Refer to DISASSEMBLY [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK CLIMATE CONTROL SEAT OPERATION 
    1. Check the climate control seat operation.

      Refer to ON-VEHICLE INSPECTION [12/2019 - ] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2023 - ] 

  6. INSPECT S/HTR F/L RELAY 

    Refer to ON-VEHICLE INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE S/HTR F/L RELAY 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (POWER SUPPLY - S/HTR F/L RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      S/HTR F/L relay holder terminal 1 - Body ground Ignition switch ON 11 V to 14 V
      S/HTR F/L relay holder terminal 3 - Body ground Always 11 V to 14 V
      GTY938109Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a S/HTR F/L Relay Holder

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (S/HTR F/L RELAY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH) 
    1. Disconnect the e20 seat cushion climate control blower assembly LH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S/HTR F/L relay holder terminal 5 - e20-1 (IG) Always Below 1 Ω
      S/HTR F/L relay holder terminal 5 or e20-1 (IG) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (S/HTR F/L RELAY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S/HTR F/L relay holder terminal 2 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - BODY GROUND) 
    1. Disconnect the e20 seat cushion climate control blower assembly LH connector.
      GTY866934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Seat Cushion Climate Control Blower Assembly LH)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e20-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      e20-1 (IG) - Body ground Ignition switch off Below 1 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      e20-8 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the H62 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e20-7 (SIGN) - H62-14 (LOUT) Always Below 1 Ω
      e20-7 (SIGN) or H62-14 (LOUT) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the H62 air conditioning amplifier assembly connector.
      GTY1178659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Air Conditioning Amplifier Assembly)
    2. Reconnect the e20 seat cushion climate control blower assembly LH connector.
    3. Using an oscilloscope, check the input signal waveform.
      MEASUREMENT CONDITION

      Item Content
      Tester Connection H62-14 (LOUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition
      • Ignition switch ON
      • Climate control switch on

      OK

      Waveform is similar to that shown in the illustration.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2023 - ] 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  13. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Right Seat Blower Front RH seat blower operation OFF or ON -

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Front Right Seat Blower

      Result

      Result Proceed to
      Both front RH seat cushion blower and front RH seatback blower operate A
      Only front RH seatback blower does not operate B
      Only front RH seat cushion blower does not operate C
      Both front RH seat cushion blower and front RH seatback blower do not operate D

    Result: 

    A 

    GO TO AIR CONDITIONING SYSTEM 

    For HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

    For Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

    Result: 

    C 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH. Refer to  DISASSEMBLY [11/2023 - ] 

    Result: 

    D 

    See step  17

    Result: 

    B 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (SEATBACK CLIMATE CONTROL BLOWER RH - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH) 
    1. Disconnect the g1 seatback climate control blower RH connector.
    2. Disconnect the e9 seat cushion climate control blower assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      g1-1 (IG) - e9-5 (CTB) Always Below 1 Ω
      g1-1 (IG) or e9-5 (CTB) - Body ground Always 10 kΩ or higher
      g1-3 (BFB+) - e9-6 (BBS) Always Below 1 Ω
      g1-3 (BFB+) or e9-6 (BBS) - Body ground Always 10 kΩ or higher
      g1-4 (GND) - e9-4 (BFB-) Always Below 1 Ω
      g1-4 (GND) or e9-4 (BFB-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. REPLACE SEATBACK CLIMATE CONTROL BLOWER RH 
    1. Temporarily replace the seatback climate control blower RH with a new or known good one.

      Refer to DISASSEMBLY [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK CLIMATE CONTROL SEAT OPERATION 
    1. Check the climate control seat operation.

      Refer to ON-VEHICLE INSPECTION [12/2019 - ] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (SEATBACK CLIMATE CONTROL BLOWER RH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH. Refer to  DISASSEMBLY [11/2023 - ] 

  17. INSPECT S/HTR F/R RELAY 

    Refer to ON-VEHICLE INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE S/HTR F/R RELAY 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (POWER SUPPLY - S/HTR F/R RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      S/HTR F/R relay holder terminal 1 - Body ground Ignition switch ON 11 V to 14 V
      S/HTR F/R relay holder terminal 3 - Body ground Always 11 V to 14 V
      GTY938109Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a S/HTR F/R Relay Holder

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (S/HTR F/R RELAY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH) 
    1. Disconnect the e9 seat cushion climate control blower assembly RH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S/HTR F/R relay holder terminal 5 - e9-1 (IG) Always Below 1 Ω
      S/HTR F/R relay holder terminal 5 or e9-1 (IG) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (S/HTR F/R RELAY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S/HTR F/R relay holder terminal 2 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - BODY GROUND) 
    1. Disconnect the e9 seat cushion climate control blower assembly RH connector.
      GTY866933Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Seat Cushion Climate Control Blower Assembly RH)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e9-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      e9-1 (IG) - Body ground Ignition switch off Below 1 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      e9-8 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  22

  22. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the H62 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e9-7 (SIGN) - H62-13 (ROUT) Always Below 1 Ω
      e9-7 (SIGN) or H62-13 (ROUT) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  23

  23. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the H62 air conditioning amplifier assembly connector.
    2. Reconnect the e9 seat cushion climate control blower assembly RH connector.
      GTY1178649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Air Conditioning Amplifier Assembly)
    3. Using an oscilloscope, check the input signal waveform.
      MEASUREMENT CONDITION

      Item Content
      Tester Connection H62-13 (ROUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition
      • Ignition switch ON
      • Climate control switch on

      OK

      Waveform is similar to that shown in the illustration.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH. Refer to  DISASSEMBLY [11/2023 - ] 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  24. REPLACE CLIMATE CONTROL SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) 
    1. Temporarily replace the climate control switch (air conditioning control assembly) with a new or known good one.

      Refer to REMOVAL [12/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  25

  25. CHECK CLIMATE CONTROL SEAT OPERATION 
    1. Check the climate control seat operation.

      Refer to ON-VEHICLE INSPECTION [12/2019 - ] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (CLIMATE CONTROL SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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