SEAT HEATER SYSTEM, Diagnostic DTC:B14C1

DTC Code DTC Name
B14C1 Front Left Seat Heat Sensor Circuit

DESCRIPTION

Output to the front seat cushion heater temperature sensor stops if one of the following occurs: 1) the temperature sensor is open or shorted; or 2) the temperature sensor is damaged and its output value does not change.

DTC No. Detection Item DTC Detection Condition Trouble Area
B14C1 Front Left Seat Heat Sensor Circuit Seat heater temperature sensor malfunction

  • Air conditioning amplifier assembly

  • Separate type front seat cushion cover LH*1

  • Seat heater control sub-assembly LH*1

  • Front seat cushion pad with cover LH*2

  • Harness and connector

WIRING DIAGRAM


  1. for L-Sport Seat Type


    1. for LHD:


      1. for Power Seat

        B008JEWE07
        *a SHL
        *b Separate Type Front Seat Cushion Cover LH
        *c Seat Heater Control Sub-assembly LH
        *d Air Conditioning Amplifier Assembly

      2. for Manual Seat

        B008JEWE11
        *a SHL
        *b Separate Type Front Seat Cushion Cover LH
        *c Seat Heater Control Sub-assembly LH
        *d Air Conditioning Amplifier Assembly

    2. for RHD:


      1. for Power Seat:

        B008JEWE08
        *a SHL
        *b Separate Type Front Seat Cushion Cover LH
        *c Seat Heater Control Sub-assembly LH
        *d Air Conditioning Amplifier Assembly

      2. for Manual Seat:

        B008JEWE12
        *a SHL
        *b Separate Type Front Seat Cushion Cover LH
        *c Seat Heater Control Sub-assembly LH
        *d Air Conditioning Amplifier Assembly

  2. for F-Sport Seat Type


    1. for LHD:

      B008JFJE05
      *a TH
      *b Front Seat Cushion Pad with Cover LH
      *c Air Conditioning Amplifier Assembly

    2. for RHD:

      B008JFJE06
      *a TH
      *b Front Seat Cushion Pad with Cover LH
      *c Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note


  • If the battery voltage is low, the seat heater system may not operate. When "High Power Consumption / Partial Limit On AC/Heater Operation." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.

    Click here

    Tech Tips

    If the battery voltage is low, "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2) is counted.

    Click here


  • If the battery voltage is low, the seat heater system may not operate. Refer to Data List for the power steering system.


    • for Manual Tilt and Manual Telescopic Steering Column: Click here

    • for Power Tilt and Power Telescopic Steering Column: Click here

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14C1 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. READ VALUE USING GTS (FL Seat Heater Temperature)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FL Seat Heater Temperature Front seat LH heater temperature -29.7°C to 59.55°C Within range from 32 to 43°C (89 to 109°F) Front seat heater is on

      Body Electrical > Air Conditioner > Data List
      Tester Display
      FL Seat Heater Temperature
      OK
      On the GTS screen, the seat heater temperature is as specified in the normal condition column.
      Result
      Result Proceed to
      OK A
      NG (for L-Sports Seat Type) B
      NG (for F-Sports Seat Type) C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    INSPECT FRONT SEAT CUSHION PAD WITH COVER LH Click here

    B

  4. INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER LH


    1. Remove the separate type front seat cushion cover LH.


    2. Inspect the separate type front seat cushion cover LH.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION COVER LH for Manual Seat: Click here for Power Seat: Click here

    OK

  5. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. B008H9CC16
      *A for Power Seat
      *B for Manual Seat
      *a

      Seat Heater Control Sub-assembly LH

      (to Air Conditioning Amplifier Assembly)
      *b

      Seat Heater Control Sub-assembly LH

      (to Separate Type Front Seat Cushion Cover LH)

      Disconnect the g5*1 or Q48*2 and SHL seat heater control sub-assembly LH connectors.


      • *1: for Power Seat

      • *2: for Manual Seat

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

      Standard Resistance
      for Power Seat
      Tester Connection Condition Specified Condition
      g5-5 (THR) - SHL-2 (TH1) Always Below 1 Ω
      g5-5 (THR) or SHL-2 (TH1) - Body ground Always 10 kΩ or higher
      g5-2 (PR) - SHL-3 (TH2) Always Below 1 Ω
      g5-2 (PR) or SHL-3 (TH2) - Body ground Always 10 kΩ or higher
      for Manual Seat
      Tester Connection Condition Specified Condition
      Q48-5 (THR) - SHL-2 (TH1) Always Below 1 Ω
      Q48-5 (THR) or SHL-2 (TH1) - Body ground Always 10 kΩ or higher
      Q48-2 (PR) - SHL-3 (TH2) Always Below 1 Ω
      Q48-2 (PR) or SHL-3 (TH2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH for Manual Seat: Click here for Power Seat: Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)


    1. Disconnect the I54 air conditioning amplifier assembly connector.

    2. Disconnect the g5*1 or Q48*2 seat heater control sub-assembly LH connector.


      • *1: for Power Seat

      • *2: for Manual Seat

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

      Standard Resistance
      for LHD (for Power Seat)
      Tester Connection Condition Specified Condition
      I54-4 (TSL) - g5-5 (THR) Always Below 1 Ω
      I54-4 (TSL) or g5-5 (THR) - Body ground Always 10 kΩ or higher
      I54-8 (SG-6) - g5-2 (PR) Always Below 1 Ω
      I54-8 (SG-6) or g5-2 (PR) - Body ground Always 10 kΩ or higher
      for LHD (for Manual Seat)
      Tester Connection Condition Specified Condition
      I54-4 (TSL) - Q48-5 (THR) Always Below 1 Ω
      I54-4 (TSL) or Q48-5 (THR) - Body ground Always 10 kΩ or higher
      I54-8 (SG-6) - Q48-2 (PR) Always Below 1 Ω
      I54-8 (SG-6) or Q48-2 (PR) - Body ground Always 10 kΩ or higher
      for RHD (for Power Seat)
      Tester Connection Condition Specified Condition
      I54-3 (TSR) - g5-5 (THR) Always Below 1 Ω
      I54-3 (TSR) or g5-5 (THR) - Body ground Always 10 kΩ or higher
      I54-7 (SG-3) - g5-2 (PR) Always Below 1 Ω
      I54-7 (SG-3) or g5-2 (PR) - Body ground Always 10 kΩ or higher
      for RHD (for Manual Seat)
      Tester Connection Condition Specified Condition
      I54-3 (TSR) - Q48-5 (THR) Always Below 1 Ω
      I54-3 (TSR) or Q48-5 (THR) - Body ground Always 10 kΩ or higher
      I54-7 (SG-3) - Q48-2 (PR) Always Below 1 Ω
      I54-7 (SG-3) or Q48-2 (PR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT FRONT SEAT CUSHION PAD WITH COVER LH


    1. Remove the front seat cushion pad with cover LH.

      Click here

    2. Inspect the front seat cushion pad with cover LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT CUSHION PAD WITH COVER LH Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION PAD WITH COVER LH)


    1. Disconnect the I54 air conditioning amplifier assembly connector.

    2. Disconnect the g14 front seat cushion pad with cover LH connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I54-4 (TSL) - g14-5 (TH) Always Below 1 Ω
      I54-4 (TSL) or g14-5 (TH) - Body ground Always 10 kΩ or higher
      I54-8 (SG-6) - g14-2 (P) Always Below 1 Ω
      I54-8 (SG-6) or g14-2 (P) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      I54-3 (TSR) - g14-5 (TH) Always Below 1 Ω
      I54-3 (TSR) or g14-5 (TH) - Body ground Always 10 kΩ or higher
      I54-7 (SG-3) - g14-2 (P) Always Below 1 Ω
      I54-7 (SG-3) or g14-2 (P) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR