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Home >> Toyota >> 2021 >> Avalon Touring >> Repair and Diagnosis >> Accessories & Equipment >> Seats >> Climate Control Seat - Diagnostics & Symptom Tests (Except Hybrid) >> CLIMATE CONTROL SEAT SYSTEM (for Gasoline Model) >> Symptom Tests >> Climate Control Seat System does not Operate [04/2018 -] >> Procedure

Climate Control Seat System does not Operate [04/2018 -]: Procedure

  1. CHECK DTC OUTPUT 
    1. Clear DTCs.

      Body Electrical > Air Conditioner > Clear DTCs 

    2. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      DTC B14B5 is not output A
      DTC B14B5 output B

    Result: 

    B 

    GO TO SEAT HEATER SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 -] 

    Result: 

    A 

    See step  2

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      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  12

    Result: 

    C 

    See step  21

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      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

      OK

      The seat blower operates normally.

      Result

      Result Proceed to
      Only seatback climate control blower LH does not operate A
      Only seat cushion climate control blower LH does not operate B
      Both seat blowers do not operate C

    Result: 

    B 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

    Result: 

    C 

    See step  7

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - SEATBACK CLIMATE CONTROL BLOWER LH) 
    1. Disconnect the a11 seatback climate control blower LH connector.
    2. Disconnect the R34 seat cushion climate control blower LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      a11-1 (CTB) - R34-5 (CTB) Always Below 1 Ω
      a11-1 (CTB) or R34-5 (CTB) - Body ground Always 10 kΩ or higher
      a11-3 (BBS) - R34-6 (BBS) Always Below 1 Ω
      a11-3 (BBS) or R34-6 (BBS) - Body ground Always 10 kΩ or higher
      a11-4 (BFB-) - R34-4 (BFB-) Always Below 1 Ω
      a11-4 (BFB-) or R34-4 (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  5

  5. 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 [04/2018 - 08/2020] , or refer to DISASSEMBLY [08/2020 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      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 LH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

  7. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER LH - BODY GROUND) 
    1. Disconnect the R34 seat cushion climate control blower LH connector.
      GTY866980Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Seat Cushion Climate Control Blower LH)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      R34-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      R34-1 (IG) - Body ground Engine switch off Below 1 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      R34-8 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G35 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
      R34-7 (SIGN) - G35-24 (LOUT) Always Below 1 Ω
      R34-7 (SIGN) or G35-24 (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  9

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the G35 air conditioning amplifier assembly connector.
    2. Reconnect the R34 seat cushion climate control blower LH connector.
      GTY928659Courtesy 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 G35-24 (LOUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition
      • Engine switch on (IG)
      • Climate control switch on

        (blower position)

      OK

      Waveform is similar to that shown in the illustration.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

    Result: 

    NG 

    See step  10

  10. REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Temporarily replace the climate control switch (radio and display receiver assembly) with a new or known good one.

      Refer to REMOVAL [04/2018 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 -] 

  12. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      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

      OK

      The seat blower operates normally.

      Result

      Result Proceed to
      Only seatback climate control blower RH does not operate A
      Only seat cushion climate control blower RH does not operate B
      Both seat blowers do not operate C

    Result: 

    B 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

    Result: 

    C 

    See step  16

    Result: 

    A 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER RH - SEATBACK CLIMATE CONTROL BLOWER RH) 
    1. Disconnect the a5 seatback climate control blower RH connector.
    2. Disconnect the R15 seat cushion climate control blower RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R15-5 (CTB) - a5-1 (CTB) Always Below 1 Ω
      R15-5 (CTB) or a5-1 (CTB) - Body ground Always 10 kΩ or higher
      R15-6 (BBS) - a5-3 (BBS) Always Below 1 Ω
      R15-6 (BBS) or a5-3 (BBS) - Body ground Always 10 kΩ or higher
      a5-4 (BFB-) - R15-4 (BFB-) Always Below 1 Ω
      a5-4 (BFB-) or R15-4 (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  14

  14. 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 [04/2018 - 08/2020] , or refer to DISASSEMBLY [08/2020 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      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 RH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

  16. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER RH - BODY GROUND) 
    1. Disconnect the R15 seat cushion climate control blower RH connector.
      GTY866981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Seat Cushion Climate Control Blower RH)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      R15-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      R15-1 (IG) - Body ground Engine switch off Below 1 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      R15-8 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER RH - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the G35 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
      R15-7 (SIGN) - G35-23 (ROUT) Always Below 1 Ω
      R15-7 (SIGN) or G35-23 (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  18

  18. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the G35 air conditioning amplifier assembly connector.
    2. Reconnect the R15 seat cushion climate control blower RH connector.
      GTY849379Courtesy 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 G35-23 (ROUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition
      • Engine switch on (IG)
      • Climate control switch on

        (blower position)

      OK

      Waveform is similar to that shown in the illustration.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH. Refer to  DISASSEMBLY [04/2018 - 08/2020]  , or refer to  DISASSEMBLY [08/2020 -] 

    Result: 

    NG 

    See step  19

  19. REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Temporarily replace the climate control switch (radio and display receiver assembly) with a new or known good one.

      Refer to REMOVAL [04/2018 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  20

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 -] 

  21. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) - BODY GROUND) 
    1. Disconnect the G20 climate control switch (radio and display receiver assembly) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G20-2 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
      G20-2 (IG+) - Body ground Engine switch off Below 1 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      G20-6 (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. REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Temporarily replace the climate control switch (radio and display receiver assembly) with a new or known good one.

      Refer to REMOVAL [04/2018 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  23

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

      Refer to ON-VEHICLE INSPECTION [04/2018 -] 

      OK

      The climate control seat operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 -] 

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