CLIMATE CONTROL SEAT SYSTEM Climate Control System does not Operate on Rear Left Side

DESCRIPTION

When the seat heater switch is operated, the rear power seat switch receives the signal. The rear power seat switch then sends the signal to the seat climate control ECU through LIN communication. The seat climate control ECU receives the signal and operates the air seat.

WIRING DIAGRAM

A01GWLYE07

INSPECTION PROCEDURE

Note

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no LIN communication malfunctions before troubleshooting this problem.

PROCEDURE


  1. CONFIRM PROBLEM SYMPTOMS

    Result
    Result Proceed to
    Air conditioner and heater do not operate A
    Heater is normal and air conditioner does not operate B
    Air conditioner is normal and heater does not operate C

    B

    CONFIRM TROUBLE AREAS Click here

    C

    READ VALUE USING INTELLIGENT TESTER (REAR POWER SEAT MODULE SWITCH) Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (REAR POWER SEAT MODULE SWITCH)


    1. Check the Data List for proper functioning of the rear power seat module switch Click here.

      Rear Console Switch
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Left Seat A/C Level Adjust Switch (Up) Rear left seat heater switch up signal / ON or OFF

      ON: Rear seat heater switch up ON

      OFF: Rear seat heater switch up OFF

      		 -
      Rear Left Seat A/C Level Adjust Switch (Down) Rear left seat heater switch down signal / ON or OFF

      ON: Rear seat heater switch down ON

      OFF: Rear seat heater switch down OFF

      		 -
      Rear Left Seat A/C Auto Switch Rear left seat heater switch auto signal / ON or OFF

      ON: Rear seat heater switch auto ON

      OFF: Rear seat heater switch auto OFF

      		 -
      OK
      Tester display changes normally when climate control switch (LH side) is operated
      Result
      Result Proceed to
      NG (except 4-Passenger with Ottoman) A
      NG (for 4-Passenger with Ottoman) B
      OK (w/o Ottoman) C
      OK (w/ Ottoman) D

    B

    REPLACE REAR POWER SEAT MODULE SWITCH Click here

    C

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    D

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    A

    REPLACE REAR POWER SEAT MODULE SWITCH Click here

  3. CONFIRM TROUBLE AREAS

    Result
    Result Proceed to
    Cushion and seatback sides do not operate A
    Cushion side does not operate B
    Seatback side does not operate C

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AIRFLOW) Click here

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AIRFLOW) Click here

    A

  4. READ VALUE USING INTELLIGENT TESTER (REAR POWER SEAT MODULE SWITCH)


    1. Check the Data List for proper functioning of the rear power seat module switch Click here.

      Rear Console Switch
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Left Seat A/C Level Adjust Switch (Up) Rear left seat heater switch up signal / ON or OFF

      ON: Rear seat heater switch up ON

      OFF: Rear seat heater switch up OFF

      		 -
      Rear Left Seat A/C Level Adjust Switch (Down) Rear left seat heater switch down signal / ON or OFF

      ON: Rear seat heater switch down ON

      OFF: Rear seat heater switch down OFF

      		 -
      Rear Left Seat A/C Auto Switch Rear left seat heater switch auto signal / ON or OFF

      ON: Rear seat heater switch auto ON

      OFF: Rear seat heater switch auto OFF

      		 -
      OK
      Tester display changes normally when climate control switch (LH side) is operated
      Result
      Result Proceed to
      OK A
      NG (for 4-Passenger with Ottoman) B
      NG (except 4-Passenger with Ottoman) C

    B

    REPLACE REAR POWER SEAT MODULE SWITCH Click here

    C

    REPLACE REAR POWER SEAT MODULE SWITCH Click here

    A

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COOL AIR)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check the climate control seat function Click here.

      Rear Left Seat A/C
      Tester Display Test Part Control Range
      Cool air Cool air operation OFF / ON
      OK
      Cool air operates normally
      Result
      Result Proceed to
      NG A
      OK (w/o Ottoman) B
      OK (w/ Ottoman) C

    B

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    C

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    A

  6. CHECK SEAT CLIMATE CONTROL CONTROLLER LH


    1. w/o Ottoman:

      Replace the seat climate control controller LH Click here.

    2. w/ Ottoman:

      Replace the seat climate control controller LH Click here.

    3. Check if the climate control seat function is normal.

      OK
      Climate control seat function is normal

    NG

    CHECK REAR SEATBACK CLIMATE CONTROL BLOWER LH Click here

    OK

    END (SEAT CLIMATE CONTROL CONTROLLER LH WAS DEFECTIVE)

  7. CHECK REAR SEATBACK CLIMATE CONTROL BLOWER LH


    1. w/o Ottoman:

      Replace the rear seatback climate control blower LH Click here.

    2. w/ Ottoman:

      Replace the rear seatback climate control blower LH Click here.

    3. Check if the climate control seat function is normal.

      OK
      Climate control seat function is normal

    NG

    CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH AND REAR SEATBACK CLIMATE CONTROL BLOWER LH) Click here

    OK

    END (REAR SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)

  8. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH AND REAR SEATBACK CLIMATE CONTROL BLOWER LH)


    1. A01H22PE07

      Disconnect the f28 ECU connector.

    2. Disconnect the z65 climate control controller connector.

    3. Disconnect the f32 climate control blower connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      f28-8 (TDC+) - z65-1 (TDC-) Always Below 1 Ω
      f28-7 (TDC-) - f32-2 (TDB-) Always Below 1 Ω
      z65-2 (TDC+) - f32-1 (TDB+) Always Below 1 Ω
      f28-8 (TDC+) - Body ground Always 10 kΩ or higher
      f28-7 (TDC-) - Body ground Always 10 kΩ or higher
      z65-2 (TDC+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG C

    B

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE SEAT CLIMATE CONTROL ECU Click here

  9. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AIRFLOW)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check the blower motor function Click here.

      Rear Left Seat A/C
      Tester Display Test Part Control Range
      Airflow Airflow operation OFF / Low / High
      OK
      Blower motor operates normally
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG C

    B

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    C

    CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL BLOWER LH) Click here

    A

    REPLACE SEAT CLIMATE CONTROL ECU Click here

  10. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL BLOWER LH)


    1. A01GY6UE15

      Disconnect the f28 ECU connector.

    2. Disconnect the z66 climate control blower connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      f28-4 (BFC+) - z66-2 (BFC+) Always Below 1 Ω
      f28-6 (BFC-) - z66-4 (BFC-) Always Below 1 Ω
      f28-5 (BCS) - z66-3 (BCS) Always Below 1 Ω
      f28-4 (BFC+) - Body ground Always 10 kΩ or higher
      f28-6 (BFC-) - Body ground Always 10 kΩ or higher
      f28-5 (BCS) - Body ground Always 10 kΩ or higher
      f28-4 (BFC+) - f28-6 (BFC-) Always 10 kΩ or higher
      f28-5 (BCS) - f28-4 (BFC+) Always 10 kΩ or higher
      f28-5 (BCS) - f28-6 (BFC-) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK SEAT CLIMATE CONTROL ECU


    1. A01GX2IE12

      Disconnect the z66 climate control blower connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      z66-2 (BFC+) - z66-4 (BFC-) Power switch off → on (IG) Below 1 V → 11 to 14 V
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG (w/o Ottoman) C
      NG (w/ Ottoman) D

    B

    REPLACE SEAT CLIMATE CONTROL BLOWER LH Click here

    C

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    D

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    A

    REPLACE SEAT CLIMATE CONTROL BLOWER LH Click here

  12. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AIRFLOW)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check the blower motor function Click here.

      Rear Left Seat A/C
      Tester Display Test Part Control Range
      Airflow Airflow operation OFF / Low / High
      OK
      Blower motor operates normally
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG C

    B

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    C

    CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH) Click here

    A

    REPLACE SEAT CLIMATE CONTROL ECU Click here

  13. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH)


    1. A01GX64E03

      Disconnect the f28 ECU connector.

    2. Disconnect the f31 climate control blower connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      f28-24 (BFB+) - f31-2 (BFB+) Always Below 1 Ω
      f28-26 (BFB-) - f31-4 (BFB-) Always Below 1 Ω
      f28-25 (BBS) - f31-3 (BBS) Always Below 1 Ω
      f28-24 (BFB+) - Body ground Always 10 kΩ or higher
      f28-26 (BFB-) - Body ground Always 10 kΩ or higher
      f28-25 (BBS) - Body ground Always 10 kΩ or higher
      f28-24 (BFB+) - f28-26 (BFB-) Always 10 kΩ or higher
      f28-25 (BBS) - f28-24 (BFB+) Always 10 kΩ or higher
      f28-25 (BBS) - f28-26 (BFB-) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK SEAT CLIMATE CONTROL ECU


    1. A01GZGTE01

      Disconnect the f31 climate control blower connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      f31-2 (BFB+) - f31-4 (BFB-) Power switch off → on (IG) Below 1 V → 11 to 14 V
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG (w/o Ottoman) C
      NG (w/ Ottoman) D

    B

    REPLACE SEAT CLIMATE CONTROL BLOWER LH Click here

    C

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    D

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    A

    REPLACE SEAT CLIMATE CONTROL BLOWER LH Click here

  15. READ VALUE USING INTELLIGENT TESTER (REAR POWER SEAT MODULE SWITCH)


    1. Check the Data List for proper functioning of the rear power seat module switch Click here.

      Rear Console Switch
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Left Seat A/C Level Adjust Switch (Up) Rear left seat heater switch up signal / ON or OFF

      ON: Rear seat heater switch up ON

      OFF: Rear seat heater switch up OFF

      		 -
      Rear Left Seat A/C Level Adjust Switch (Down) Rear left seat heater switch down signal / ON or OFF

      ON: Rear seat heater switch down ON

      OFF: Rear seat heater switch down OFF

      		 -
      Rear Left Seat A/C Auto Switch Rear left seat heater switch auto signal / ON or OFF

      ON: Rear seat heater switch auto ON

      OFF: Rear seat heater switch auto OFF

      		 -
      OK
      Tester display changes normally when climate control switch (LH side) is operated

    NG

    REPLACE REAR POWER SEAT MODULE SWITCH Click here

    OK

  16. INSPECT REAR SEATBACK COVER LH


    1. Remove the rear seatback cover LH.


    2. Inspect the rear seatback cover LH.


      Result
      Result Proceed to
      OK A
      NG (w/o Ottoman) B
      NG (w/ Ottoman) C

    B

    REPLACE REAR SEATBACK COVER LH Click here

    C

    REPLACE REAR SEATBACK COVER LH Click here

    A

  17. INSPECT REAR SEAT CUSHION COVER LH


    1. Remove the rear seat cushion cover LH.


    2. Inspect the rear seat cushion cover LH.


      Result
      Result Proceed to
      OK A
      NG (w/o Ottoman) B
      NG (w/ Ottoman) C

    B

    REPLACE REAR SEAT CUSHION COVER LH Click here

    C

    REPLACE REAR SEAT CUSHION COVER LH Click here

    A

  18. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER LH AND BODY GROUND)


    1. A01H1A4E15

      Disconnect the f51 ECU connector.

    2. Disconnect the f50 seatback cover connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      f51-1 (AMP) - f50-5 (SWL) Always Below 1 Ω
      f51-1 (AMP) - Body ground Always 10 kΩ or higher
      f50-6 (E) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (w/o Ottoman) A
      OK (w/ Ottoman) B
      NG C

    B

    REPLACE SEAT CLIMATE CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE SEAT CLIMATE CONTROL ECU Click here