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

DTC Code DTC Name
B14B2 Lost Communication with Front Panel LIN

DESCRIPTION

This circuit consists of the air conditioning control assembly and the air conditioning amplifier assembly. When the air conditioning control assembly is operated, signals are transmitted to the air conditioning amplifier assembly through the LIN communication system.

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

DTC Code DTC Detection Condition Trouble Area
B14B2 Lost communication with the air conditioning control assembly.

  • Harness or connector

  • LIN communication system

  • Air conditioning control assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A002Q15E60

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 - AIR CONDITIONING AMPLIFIER)


    1. A002PS1E04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)
      *2

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      Disconnect the H46 amplifier connector.

    2. Disconnect the H21 air conditioning control connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H21-10 (LIN1) - H46-37 (LIN1) Always Below 1 Ω
      H21-10 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A002PHSE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      Disconnect the H21 air conditioning control connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H21-2 (IG+) - H21-5 (GND) Ignition switch off Below 1 V
      H21-2 (IG+) - H21-5 (GND) Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H21-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY


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


    NEXT

  4. CHECK AIR CONDITIONING CONTROL ASSEMBLY


    1. Operate the air conditioning control to check that it functions properly.

      OK
      Air conditioning control assembly operates normally.

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY IS FAULTY)

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here