AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B14B2

DTC Code DTC Name
B14B2 Lost Communication with Front Panel LIN

DESCRIPTION

The air conditioning control assembly communicates with the air conditioning amplifier assembly through the LIN communication system.

If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the air conditioning control assembly is operated.

DTC No. DTC Detection Condition Trouble Area
B14B2 Lost communication with the air conditioning control assembly.

  • LIN communication system

  • Air conditioning control assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01VKFPE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - IG1 NO. 1 RELAY)

    A01VH0LE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

    1. Disconnect the F40 air conditioning control assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F40-5 (IG+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND)


    1. A01VJ1SE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the F40 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F40-8 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the F40 air conditioning control assembly connector.

    2. Disconnect the F42 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F40-3 (LIN1) - F42-37 (LIN1) Always Below 1 Ω
      F40-3 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the air conditioning control assembly with a new or normally functioning one Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B14B2 is not output

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here