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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 91 (Heating / Air Conditioning System (HV) - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC B14B3-87: Lost Communication with Rear Panel LIN Missing Message [11/2023 - ] >> Procedure

DTC B14B3-87: Lost Communication with Rear Panel LIN Missing Message [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - AUXILIARY BATTERY) 

    Pre-procedure1

    1. Disconnect the T2 No. 2 air conditioning control assembly connector.

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      T2-9 (IG) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

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

    Pre-procedure1

    1. Disconnect the T2 No. 2 air conditioning control assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      T2-7 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

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

    Pre-procedure1

    1. Disconnect the T2 No. 2 air conditioning control assembly connector.
    2. Disconnect the H64 air conditioning amplifier assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      T2-8 (RLIN) - H64-20 (RLIN) Always Below 1 Ω
      T2-8 (RLIN) or H64-20 (RLIN) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT) 

    Pre-procedure1

    1. Disconnect the T2 No. 2 air conditioning control assembly connector.
    2. Connect the H64 air conditioning amplifier assembly connector.

      Procedure1

    3. Using an oscilloscope, check the waveform.
      Item Content
      Tester Connection H64-20 (RLIN) - Body ground
      Tool Setting 2 V/DIV., 20 μs/DIV.
      Condition Ignition switch ON

      OK

      The waveform displays properly.

      GTY829762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    OK 

    See step  5

  5. CHECK NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT) 

    Pre-procedure1

    1. Connect the T2 No. 2 air conditioning control assembly connector.

      Procedure1

    2. Using an oscilloscope, check the waveform.
      Item Content
      Tester Connection T2-8 (RLIN) - Body ground
      Tool Setting 2 V/DIV., 20 μs/DIV.
      Condition Ignition switch ON

      OK

      The waveform displays properly.

      GTY829762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPLACE NO. 2 AIR CONDITIONING CONTROL ASSEMBLY 

    Refer to REMOVAL [12/2019 - ]

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