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 assembly LH 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 Code DTC Detection Condition Trouble Area
B14C1 Seat heater temperature sensor malfunction

  • Air conditioning amplifier assembly

  • Front seat cushion heater assembly LH

  • Seat heater control sub-assembly LH

  • Harness or connector

WIRING DIAGRAM

B00186JE39
*a SHL
*b Front Seat Cushion Heater Assembly LH
*c Seat Heater Control Sub-assembly LH
*d Air Conditioning Amplifier Assembly

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B14C1 is not output.

    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.

      Air Conditioner
      Tester Display Measurement Item/Display Range Normal Condition Diagnostic Note
      FL Seat Heater Temperature Front seat LH side seat 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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  4. INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH


    1. Remove the front seat cushion heater assembly LH Click here.

    2. Inspect the front seat cushion heater assembly LH Click here.


    NG

    REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH Click here

    OK

  5. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. B001APDE01
      Text in Illustration
      *a

      Seat Heater Control Sub-assembly LH

      (to Air Conditioning Amplifier Assembly)
      *b

      Seat Heater Control Sub-assembly LH

      (to Front Seat Cushion Heater Assembly LH)

      Remove the seat heater control sub-assembly LH connector Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c13-5 (THL) - SHL-2 (TH1) Always Below 1 Ω
      c13-2 (PL) - SHL-3 (TH2) Always Below 1 Ω
      c13-5 (THL) or SHL-2 (TH1) - Body ground Always 10 kΩ or higher
      c13-2 (PL) or SHL-3 (TH2) - Body ground Always 10 kΩ or higher

    NG

    REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH

    OK

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


    1. Disconnect the E35 air conditioning amplifier assembly connector.

    2. Disconnect the c13 seat heater control sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E35-19 (TSL) - c13-5 (THL) Always Below 1 Ω
      E35-34 (SG-4) - c13-2 (PL) - Always Below 1 Ω
      E35-19 (TSL) or c13-5 (THL) - Body ground Always 10 kΩ or higher
      E35-34 (SG-4) or c13-2 (PL) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR