SEAT HEATER SYSTEM, Diagnostic DTC:B14B5

DTC Code DTC Name
B14B5 Lost Communication with Front Seat Temperature Adjustment Switch LIN

DESCRIPTION

The seat heater switch (air conditioning control assembly) communicates with the air conditioning amplifier assembly via LIN communication.

If the LIN communication system is malfunctioning, the air conditioning amplifier assembly will not operate even if the seat heater switch (air conditioning control assembly) is operated.

DTC No. Detection Item DTC Detection Condition Trouble Area
B14B5 Lost Communication with Front Seat Temperature Adjustment Switch LIN Lost communication with the seat heater switch (air conditioning control assembly)

  • Seat heater switch (air conditioning control assembly)

  • Air conditioning amplifier assembly

  • Wire harness or connector

WIRING DIAGRAM

B008KPHE01

CAUTION / NOTICE / HINT

Note


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

  • When DTC B14B2 and B14B5 are output simultaneously, first perform troubleshooting for the air conditioning system.


    • for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor

      Click here

    • for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor

      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 B14B5 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - BODY GROUND)


    1. B008LYFC13
      *a

      Front view of wire harness connector

      (to Seat Heater Switch (Air Conditioning Control Assembly))

      Disconnect the seat heater switch (air conditioning control assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F61-10 (IG+) - Body ground Ignition switch ON

      11 to 14 V*1

      10.5 to 16 V*2
      Ignition switch off Below 1 V

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F61-16 (GND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System) C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    GO TO STOP AND START SYSTEM Click here

    A

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY))


    1. Disconnect the F61 seat heater switch (air conditioning control assembly) connector.

    2. Disconnect the F72*1 or F73*2 air conditioning amplifier assembly connector.


      • *1: for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor

      • *2: for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor

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

      Standard Resistance
      for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor
      Tester Connection Condition Specified Condition
      F61-2 (LIN1) - F72-3 (LIN1) Always Below 1 Ω
      F61-2 (LIN1) or F72-3 (LIN1) - Body ground Always 10 kΩ or higher
      for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor
      Tester Connection Condition Specified Condition
      F61-2 (LIN1) - F73-14 (LIN1) Always Below 1 Ω
      F61-2 (LIN1) or F73-14 (LIN1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)


    1. Temporarily replace the seat heater switch (air conditioning control assembly) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      OK
      DTC B14B5 is not output.
      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14B5 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here