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AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B2

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DTC Code DTC Name
B14B2 Lost Communication with Front Panel LIN
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DESCRIPTION

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

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. Detection Item DTC Detection Condition Trouble Area Memory
B14B2 Lost Communication with Front Panel LIN

Lost communication with air conditioning control assembly


  • Diagnosis condition: Power switch on (IG)

  • Malfunction status: Lost communication with air conditioning control assembly

  • Detection time: Continuously for 10 seconds or more

  • Harness or connector

  • Air conditioning control assembly

  • Air conditioning amplifier assembly

 Memorized
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • If DTC B14B2 and B14B7 are output at the same time, troubleshoot for DTC B14B7 first.

  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE


  1. Click here

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


    1. 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
      G80-4 (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
      G80-8 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

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


    1. Disconnect the G80 air conditioning control assembly connector.

    2. Disconnect the G65 air conditioning amplifier assembly connector.

    3. Disconnect the G39 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G80-3 (LIN1) - G65-14 (LIN1) Always Below 1 Ω
      G80-3 (LIN1) or G65-14 (LIN1) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. B004V89C02
      *a Waveform

      Disconnect the air conditioning control assembly connector.

    2. Using an oscilloscope, check the waveform.

      Item Content
      Tester Connection G80-3 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition Power switch on (IG)
      OK
      The waveform displays properly.
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT SIGNAL)


    1. B004SHHC02
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)
      *b Waveform

      Using an oscilloscope, check the waveform.

      Item Content
      Tester Connection G65-14 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition Power switch on (IG)
      OK
      The waveform displays properly.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    • NG

      REPLACE AIR CONDITIONING CONTROL ASSEMBLYClick here