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 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: Engine switch on (IG)

  • Malfunction status: Lost communication with integration control and panel assembly

  • Detection time: Continuously for 10 seconds or more

  • Harness or connector

  • Integration control and panel assembly

  • Air conditioning amplifier assembly

 Memorized

WIRING DIAGRAM

B000WO6E06

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.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - BATTERY AND BODY GROUND)


    1. B000YG2C03
      *a

      Front view of wire harness connector

      (to Integration Control and Panel Assembly)

      Disconnect the integration control and panel assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P73-1 (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
      P73-8 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the P58 air conditioning amplifier assembly connector.

    2. Disconnect the P73 integration control and panel assembly connector.

    3. Disconnect the P20 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
      P58-14 (LIN1) - P73-6 (LIN1) Always Below 1 Ω
      P58-14 (LIN1) or P73-6 (LIN1) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. B000X8AC02
      *a

      Component with harness connected

      (Integration Control and Panel Assembly)

      Using an oscilloscope, check the waveform.

      Item Content
      Tester Connection P73-6 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition Engine switch on (IG)
      OK
      The waveform displays properly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  4. CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY (OUTPUT SIGNAL)


    1. Using an oscilloscope, check the waveform.

      B000YKRC04
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      		 - -
      Item Content
      Tester Connection P58-14 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition Engine switch on (IG)
      OK
      The waveform displays properly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE) Click here