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

A005JWWE02

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 - IG CIRCUIT)

    A005J7EE01
    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 Condition Specified Condition
      F40-5 (IG+) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A005ILOE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

    1. 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 AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the F42 air conditioning amplifier assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F40-2 (LIN1) - F42-37 (LIN1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F40-2 (LIN1) - Body ground Always 10 kΩ or higher
      F42-37 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


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

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

      Result
      Result Proceed to
      Air conditioning control assembly functions properly A
      Air conditioning control assembly malfunctions B

    A

    END (AIR CONDITIONING CONTROL ASSEMBLY FUNCTIONS PROPERLY)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here