CLIMATE CONTROL SEAT SYSTEM Climate Control Seat System does not Operate

DESCRIPTION

When the engine switch is on and the refreshing seat switch is operated, the air conditioning amplifier assembly receives refreshing seat switch position signals and then sends airflow amount signals to each seat cushion climate control blower assembly.

WIRING DIAGRAM

B006YWRE15

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • The climate control seat system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the climate control seat system after confirming that the communication system is functioning properly.

    Click here

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

    B

    GO TO SEAT HEATER SYSTEM Click here

    A

  2. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      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

    B

    CHECK CLIMATE CONTROL SEAT OPERATION (FRONT RH SEAT) Click here

    C

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REFRESHING SEAT SWITCH - BODY GROUND) Click here

    A

  3. CHECK CLIMATE CONTROL SEAT OPERATION (FRONT LH SEAT)


    1. Check the climate control seat operation.

      Click here

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

    B

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH Click here

    C

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - BODY GROUND) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - SEATBACK CLIMATE CONTROL BLOWER LH)


    1. Disconnect the c3 seatback climate control blower LH connector.

    2. Disconnect the b8 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
      c3-1 (IG) - b8-5 (CTB) Always Below 1 Ω
      c3-1 (IG) or b8-5 (CTB) - Body ground Always 10 kΩ or higher
      c3-3 (BFB+) - b8-6 (BBS) Always Below 1 Ω
      c3-3 (BFB+) or b8-6 (BBS) - Body ground Always 10 kΩ or higher
      c3-4 (GND) - b8-4 (BFB-) Always Below 1 Ω
      c3-4 (GND) or b8-4 (BFB-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE SEATBACK CLIMATE CONTROL BLOWER LH


    1. Temporarily replace the seatback climate control blower LH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)

    NG

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH Click here

  7. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - BODY GROUND)


    1. B006Z18C20
      *a

      Front view of wire harness connector

      (to Seat Cushion Climate Control Blower Assembly LH)

      Disconnect the b8 seat cushion climate control blower assembly LH connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      b8-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      b8-1 (IG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      b8-8 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the K54 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
      b8-7 (SIGN) - K54-24 (LOUT) Always Below 1 Ω
      b8-7 (SIGN) or K54-24 (LOUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the K54 air conditioning amplifier assembly connector.

    2. B006Z60C09
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the b8 seat cushion climate control blower assembly LH connector.

    3. Using an oscilloscope, check the input signal waveform.

      Measurement Condition
      Item Content
      Tester Connection K54-24 (LOUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Refreshing seat switch on

        (blower position)
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH Click here

    NG

  10. REPLACE REFRESHING SEAT SWITCH


    1. Temporarily replace the refreshing seat switch with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (REFRESHING SEAT SWITCH WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  12. CHECK CLIMATE CONTROL SEAT OPERATION (FRONT RH SEAT)


    1. Check the climate control seat operation.

      Click here

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

    B

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH Click here

    C

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - BODY GROUND) Click here

    A

  13. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - SEATBACK CLIMATE CONTROL BLOWER RH)


    1. Disconnect the o3 seatback climate control blower RH connector.

    2. Disconnect the a9 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
      a9-5 (CTB) - o3-1 (IG) Always Below 1 Ω
      a9-5 (CTB) or o3-1 (IG) - Body ground Always 10 kΩ or higher
      a9-6 (BBS) - o3-3 (BFB+) Always Below 1 Ω
      a9-6 (BBS) or o3-3 (BFB+) - Body ground Always 10 kΩ or higher
      o3-4 (GND) - a9-4 (BFB-) Always Below 1 Ω
      o3-4 (GND) or a9-4 (BFB-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. REPLACE SEATBACK CLIMATE CONTROL BLOWER RH


    1. Temporarily replace the seatback climate control blower RH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (SEATBACK CLIMATE CONTROL BLOWER RH WAS DEFECTIVE)

    NG

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH Click here

  16. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - BODY GROUND)


    1. B006Z18C21
      *a

      Front view of wire harness connector

      (to Seat Cushion Climate Control Blower Assembly RH)

      Disconnect the a9 seat cushion climate control blower assembly RH connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      a9-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      a9-1 (IG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      a9-8 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the K54 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
      a9-7 (SIGN) - K54-23 (ROUT) Always Below 1 Ω
      a9-7 (SIGN) or K54-23 (ROUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the K54 air conditioning amplifier assembly connector.

    2. B006Z60C10
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the a9 seat cushion climate control blower assembly RH connector.

    3. Using an oscilloscope, check the input signal waveform.

      Measurement Condition
      Item Content
      Tester Connection K54-23 (ROUT) - Body ground
      Tool Setting 1 V/DIV., 0.5 ms/DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Refreshing seat switch on

        (blower position)
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH Click here

    NG

  19. REPLACE REFRESHING SEAT SWITCH


    1. Temporarily replace the refreshing seat switch with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  20. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (REFRESHING SEAT SWITCH WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  21. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REFRESHING SEAT SWITCH - BODY GROUND)


    1. Disconnect the K49 refreshing seat switch connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      K49-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      K49-1 (IG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      K49-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  22. REPLACE REFRESHING SEAT SWITCH


    1. Temporarily replace the refreshing seat switch with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  23. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (REFRESHING SEAT SWITCH WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here