SEAT HEATER SYSTEM, Diagnostic DTC:B14C2

DTC Code DTC Name
B14C2 Rear Right Seat Heat Sensor Circuit

DESCRIPTION

Power supply to the temperature sensor built into the rear seat cushion heater stops if one of the following occurs: 1) an open or short occurs in the temperature sensor circuit; or 2) the temperature sensor is damaged and its output value does not change.

DTC No. Detection Item DTC Detection Condition Trouble Area
B14C2 Rear Right Seat Heat Sensor Circuit Seat heater temperature sensor malfunction

  • Air conditioning amplifier assembly

  • Bench type rear seat cushion cover

  • Harness or connector

WIRING DIAGRAM

B002J7JE03
*a Bench Type Rear Seat Cushion Cover
*b Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note


  • If the auxiliary 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 auxiliary battery, referring to On-vehicle Inspection for the charging system.

    Tech Tips

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

    Click here

    Click here

  • If the auxiliary 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

  • When the auxiliary battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    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 B14C2 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. READ VALUE USING GTS (RR SEAT HEATER TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the power 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
      RR Seat Heater Temperature Rear seat RH heater temperature -29.7°C to 59.55°C

      • HI: 41 to 42 °C (106 to 108 °F)

      • MID: 37 to 38 °C (99 to 100 °F)

      • LO: 35 to 36 °C (95 to 97 °F)

      		 Refreshing seat switch (for Rear seat RH) is on (w/ Rear Seat Heater)

      Body Electrical > Air Conditioner > Data List
      Tester Display
      RR Seat Heater Temperature
      OK
      On the GTS screen, the seat heater temperature is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  4. INSPECT BENCH TYPE REAR SEAT CUSHION COVER


    1. Remove the bench type rear seat cushion cover.


    2. Inspect the bench type rear seat cushion cover.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BENCH TYPE REAR SEAT CUSHION COVER for Manual Seat: Click here for Power Seat: Click here

    OK

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


    1. Disconnect the I54 air conditioning amplifier assembly connector.

    2. Disconnect the h6 bench type rear seat cushion cover connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I54-5 (TFAR) - h6-3 Always Below 1 Ω
      I54-5 (TFAR) or h6-3 - Body ground Always 10 kΩ or higher
      I54-23 (SG-7) - h6-2 Always Below 1 Ω
      I54-23 (SG-7) or h6-2 - 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