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 conditioninging amplifier assembly through the LIN communication system.

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

DTC No. Detection Item DTC Detection conditioning Trouble Area Memory Note
B14B2 Lost Communication with Front Panel LIN Lost communication with the air conditioning control assembly.

  • Harness or connector

  • LIN communication system

  • Air conditioning control assembly

  • Air conditioninging amplifier assembly

 Memorized (10 seconds or more) -

Tech Tips

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the parentheses.

WIRING DIAGRAM

B006NSLE01

CAUTION / NOTICE / HINT

Note


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

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

    Click here

PROCEDURE


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


    1. B006MA5C12
      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      Disconnect the 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
      G30-4 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G30-5 (IG+) - Body ground Engine switch off Below 1 V
      G30-5 (IG+) - Body ground Engine switch on (IG)

      11 to 14 V*1

      10.5 to 16 V*2

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the G30 air conditioning control assembly connector.

    2. Disconnect the G36 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
      G30-3 (LIN1) - G36-37 (LIN1) Always Below 1 Ω
      G30-3 (LIN1) or G36-37 (LIN1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the air conditioning control assembly.

      Click here

    2. When troubleshooting according to the DTC:


      1. Check for DTCs.

        Click here


        Body Electrical > Air Conditioner > Trouble Codes
        OK
        DTC B14B2 is not output.

    3. When troubleshooting according to Problem Symptoms Table:


      1. Check the air conditioning control assembly operates normally.

        Tech Tips

        Since the air conditioning control assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning control assembly with a new or known good one and check that the condition returns to normal.

        OK
        Air conditioning control assembly operation returns to normal.
      Result
      Result Proceed to
      OK A
      NG (When troubleshooting according to the DTC) B
      NG (When troubleshooting according to Problem Symptoms Table) C

    A

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here

    C

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