CLIMATE CONTROL SEAT SYSTEM Climate Control Seat System does not Operate

DESCRIPTION

The air conditioning amplifier assembly receives refreshing seat switch position signals when the power switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

WIRING DIAGRAM

A011O44E03

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

  • If the auxiliary battery voltage is low, the seat climate control seat system may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the auxiliary battery, referring to On-vehicle Inspection for the charging system.

    Click here

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      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 again.

      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 climate control 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 d1 seatback climate control blower LH connector.

    2. Disconnect the b6 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
      d1-1 (IGB) - b6-3 (IGB) Always Below 1 Ω
      d1-1 (IGB) - Body ground Always 10 kΩ or higher
      b6-3 (IGB) - Body ground Always 10 kΩ or higher
      d1-2 (VS) - b6-4 (VS) Always Below 1 Ω
      d1-2 (VS) - Body ground Always 10 kΩ or higher
      b6-4 (VS) - Body ground Always 10 kΩ or higher
      d1-3 (GND) - b6-2 (GND2) Always Below 1 Ω
      d1-3 (GND) - Body ground Always 10 kΩ or higher
      b6-2 (GND2) - 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. Disconnect the b6 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
      b6-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      b6-1 (IG) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      b6-6 (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 K10 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
      b6-5 (SI) - K10-10 (LOUT) Always Below 1 Ω
      b6-5 (SI) - Body ground Always 10 kΩ or higher
      K10-10 (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 K10 air conditioning amplifier assembly connector.

    2. A011PJNC05
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the b6 seat cushion climate control blower assembly LH connector.

    3. Check the input signal waveform.


      1. Connect an oscilloscope to terminal K10-10 (LOUT) and body ground with the air conditioning amplifier assembly connector still connected.

      2. Check the signal waveform according to the condition(s) in the table below.

        Measurement Condition
        Item Content
        Tester Connection K10-10 (LOUT) - Body ground
        Tool Setting 1 V/DIV., 1 ms/DIV.
        Vehicle Condition

        • Power switch on (IG)

        • Refreshing seat switch (for LH) 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 again.

      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 climate control 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 c1 seatback climate control blower RH connector.

    2. Disconnect the a10 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
      c1-1 (IGB) - a10-3 (IGB) Always Below 1 Ω
      c1-1 (IGB) - Body ground Always 10 kΩ or higher
      a10-3 (IGB) - Body ground Always 10 kΩ or higher
      c1-2 (VS) - a10-4 (VS) Always Below 1 Ω
      c1-2 (VS) - Body ground Always 10 kΩ or higher
      a10-4 (VS) - Body ground Always 10 kΩ or higher
      c1-3 (GND) - a10-2 (GND2) Always Below 1 Ω
      c1-3 (GND) - Body ground Always 10 kΩ or higher
      a10-2 (GND2) - 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 operation again.

      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. Disconnect the a10 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
      a10-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      a10-1 (IG) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      a10-6 (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 K10 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
      a10-5 (SI) - K10-11 (ROUT) Always Below 1 Ω
      a10-5 (SI) - Body ground Always 10 kΩ or higher
      K10-11 (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 K10 air conditioning amplifier assembly connector.

    2. A011PJNC06
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the a10 seat cushion climate control blower assembly RH connector.

    3. Check the input signal waveform.


      1. Connect an oscilloscope to terminal K10-11 (ROUT) and body ground with the air conditioning amplifier assembly connector still connected.

      2. Check the signal waveform according to the condition(s) in the table below.

        Measurement Condition
        Item Content
        Tester Connection K10-11 (ROUT) - Body ground
        Tool Setting 1 V/DIV., 1 ms/DIV.
        Vehicle Condition

        • Power switch on (IG)

        • Refreshing seat switch (for RH) 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 K99 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
      K99-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      K99-1 (IG) - Body ground Power switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      K99-4 (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