AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B14B3

DTC Code DTC Name
B14B3 Lost Communication with Rear Panel LIN

DESCRIPTION

The No. 2 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 No. 2 air conditioning control assembly is operated.

DTC No. DTC Detection Condition Trouble Area
B14B3 Lost communication with the No. 2 air conditioning control assembly.

  • No. 2 air conditioning control assembly

  • Air conditioning amplifier assembly

  • LIN communication system

  • Harness or connector

WIRING DIAGRAM

A01X437E23

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01X8JCE03
      Text in Illustration
      *a

      Front view of harness connector

      (to No. 2 air conditioning control assembly)

      Disconnect the No. 2 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E55-1 (E) - 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
      E55-6 (IG+) - Body ground Ignition switch off Below 1 V
      E55-6 (IG+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the E55 No. 2 air conditioning control assembly connector.

    2. Disconnect the E36 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
      E55-4 (RLIN) - E36-20 (RLIN) Always Below 1 Ω
      E55-4 (RLIN) or E36-20 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK NO. 2 AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the No. 2 air conditioning control assembly with new or known good one Click here.

      Tech Tips

      Since the No. 2 air conditioning control assembly cannot be inspected while it is removed from the vehicle, replace the No. 2 air conditioning control assembly with a new or a known good one and check that the condition returns to normal.

      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    2. When troubleshooting according to the DTC:


      1. Clear the DTCs Click here.

      2. Check for DTCs Click here.

        OK
        DTC B14B3 is not output.

    3. When troubleshooting according to Problem Symptoms Table:


      1. Check that the No. 2 air conditioning control assembly operation returns to normal.

        OK
        No. 2 air conditioning control assembly operation returns to normal.

    A

    END (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

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