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LIN Communication Circuit [12/2015 - 08/2016]: Procedure

  1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) - EACH ECU) 
    GTY687785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TEXT IN ILLUSTRATION

    *a Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly (A/C ECU))    		 *b Front view of wire harness connector
    (to Air Conditioning Control Assembly)
    *c Front view of wire harness connector
    (to No. 2 Air Conditioning Control Assembly)    		 - -
    1. Disconnect the D75 and D74 air conditioning amplifier assembly (A/C ECU) connectors.
    2. Disconnect the D69 air conditioning control assembly connector.
    3. Disconnect the T7 No. 2 air conditioning control assembly connector.
    4. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      D75-37 (LIN1) - D69-8 (LIN1) Always Below 1 Ω
      D74-13 (RLIN) - T7-2 (RLIN) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      D75-37 (LIN1) - Body ground Always 10 kΩ or higher
      D74-13 (RLIN) - Body ground Always 10 kΩ or higher

      Standard Voltage

      Tester Connection Condition Specified Condition
      D75-37 (LIN1) - Body ground Always Below 1 V
      D74-13 (RLIN) - Body ground Always Below 1 V

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY NO. 2 - BATTERY AND BODY GROUND) 
    1. Disconnect the T7 No. 2 air conditioning control assembly connector.
      GTY705261Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      T7-4 (E) - Body ground Always Below 1 Ω

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      T7-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 2 Air Conditioning Control Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. REPLACE NO. 2 AIR CONDITIONING CONTROL ASSEMBLY 
    1. Temporarily replace the No. 2 air conditioning control assembly with a new or normally functioning one (Refer to REMOVAL [12/2015 - ] ).
    2. Check that the No. 2 air conditioning control assembly function is normal.

      OK

      No. 2 Air conditioning control assembly function is normal.

    Result: 

    OK 

    END (AIR CONDITIONING CONTROL ASSEMBLY NO. 2 IS MALFUNCTIONING) 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the D69 air conditioning control assembly connector.
      GTY693057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D69-5 (GND) - Body ground Always Below 1 Ω

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D69-4 (IG+) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Air Conditioning Control Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. REPLACE AIR CONDITIONING CONTROL ASSEMBLY 
    1. Temporarily replace the air conditioning control assembly with a new or normally functioning one (Refer to REMOVAL [12/2015 - ] ).
    2. Check that the front air conditioning control assembly function is normal.

      OK

      Front air conditioning control assembly function is normal.

    Result: 

    OK 

    END (AIR CONDITIONING CONTROL ASSEMBLY IS MALFUNCTIONING) 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) 

    (Refer to REMOVAL [12/2015 - ] )

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