SEAT HEATER SYSTEM Driver Side Seat Heater does not Operate

DESCRIPTION

When the refreshing seat switch is operated, the air conditioning amplifier assembly receives the signal. The refreshing seat switch sends the signal to the air conditioning amplifier assembly through LIN communication. The air conditioning amplifier assembly receives the signal and operates the seat heater.

WIRING DIAGRAM


  1. for LHD:

    A01FSUGE01

  2. for RHD:

    A01FSUGE02

INSPECTION PROCEDURE

Note


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

  • If the auxiliary battery voltage becomes low, seat heater operation is canceled to prioritize supplying power to the power steering system.

Tech Tips

Since the seat heater system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B14B5 and B14C1*1 or B14C0*2 is not output A
      DTC B14B5 or B14C1*1 or B14C2*2 is output B

      • *1: for LHD

      • *2: for RHD


    B

    GO TO DTC CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SEPARATE TYPE FRONT SEAT CUSHION COVER - BATTERY AND BODY GROUND)


    1. A01FRT3E03
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Separate Type Front Seat Cushion Cover)

      Disconnect the separate type front seat cushion cover connector.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      d22-2 (B) - Body ground Power switch on (IG) 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      c22-2 (B1) - Body ground Power switch on (IG) 11 to 14 V
      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      d22-3 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      c22-3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER


    1. Remove the separate type front seat cushion cover.


    2. Inspect the separate type front seat cushion cover.


      Result
      Result Proceed to
      OK A
      NG (for Standard Seat Type) B
      NG (for Sports Seat Type) C
      NG (for Luxury Seat Type) D

    B

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION COVER Click here

    C

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION COVER Click here

    D

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION COVER Click here

    A

  4. INSPECT SEPARATE TYPE FRONT SEAT BACK COVER


    1. Remove the separate type front seat back cover.


    2. Inspect the separate type front seat back cover.


      Result
      Result Proceed to
      OK A
      NG (for Standard Seat Type) B
      NG (for Sports Seat Type) C
      NG (for Luxury Seat Type) D

    B

    REPLACE SEPARATE TYPE FRONT SEAT BACK COVER Click here

    C

    REPLACE SEPARATE TYPE FRONT SEAT BACK COVER Click here

    D

    REPLACE SEPARATE TYPE FRONT SEAT BACK COVER Click here

    A

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEPARATE TYPE FRONT SEAT CUSHION COVER)


    1. Disconnect the N78 and N157 air conditioning amplifier assembly connectors.

    2. Disconnect the c22*2 or d22*1 separate type front seat cushion cover connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      N78-16 (SHD+) - d22-5 (SWL) Always Below 1 Ω
      N157-19 (TSL) - d22-1 (THL) Always Below 1 Ω
      N157-35 (SG-4) - d22-7 (PL) Always Below 1 Ω
      N78-16 (SHD+) - Body ground Always 10 kΩ or higher
      N157-19 (TSL) - Body ground Always 10 kΩ or higher
      N157-35 (SG-4) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      N78-15 (SHP+) - c22-5 (SWR) Always Below 1 Ω
      N157-20 (TSR) - c22-1 (THR) Always Below 1 Ω
      N157-34 (SG-3) - c22-7 (PR) Always Below 1 Ω
      N78-15 (SHP+) - Body ground Always 10 kΩ or higher
      N157-20 (TSR) - Body ground Always 10 kΩ or higher
      N157-34 (SG-3) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  6. REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. Temporarily replace the seat heater control sub-assembly LH with a new or normally functioning one.



    NEXT

  7. CHECK SEAT HEATER SYSTEM


    1. Check the seat heater system Click here.

      OK
      Seat heater system operates normally

    NG

    REPLACE REFRESHING SEAT SWITCH Click here

    OK

    END (SEAT HEATER CONTROL SUB-ASSEMBLY LH WAS DEFECTIVE)

  8. REPLACE REFRESHING SEAT SWITCH


    1. Temporarily replace the refreshing seat switch with a new or normally functioning one Click here.


    NEXT

  9. CHECK SEAT HEATER SYSTEM


    1. Check the seat heater system Click here.

      OK
      Seat heater system operates normally

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (REFRESHING SEAT SWITCH WAS DEFECTIVE)

  10. REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH


    1. Temporarily replace the seat heater control sub-assembly RH with a new or normally functioning one.



    NEXT

  11. CHECK SEAT HEATER SYSTEM


    1. Check the seat heater system Click here.

      OK
      Seat heater system operates normally

    NG

    REPLACE REFRESHING SEAT SWITCH Click here

    OK

    END (SEAT HEATER CONTROL SUB-ASSEMBLY RH WAS DEFECTIVE)

  12. REPLACE REFRESHING SEAT SWITCH


    1. Temporarily replace the refreshing seat switch with a new or normally functioning one Click here.


    NEXT

  13. CHECK SEAT HEATER SYSTEM


    1. Check the seat heater system Click here.

      OK
      Seat heater system operates normally

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (REFRESHING SEAT SWITCH WAS DEFECTIVE)