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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Heater, Ventilator And A/C) >> Heater & Air Conditioner System (For Automatic Air Conditioning System) >> ECM Terminal Arrangement

ECM Terminal Arrangement

  1. Air conditioner control ASSY
    G12591568Courtesy of SUBARU OF AMERICA, INC.

    Standard value

    STANDARD VALUE SPECIFICATION - CONNECTOR D19

    Terminal No. (Terminal symbol) Input/Output Item Measuring conditions Standard value
    D19-1 (ACC)←→D19-16 (GND) Input Voltage IG ACC 10 to 16 V
    D19-2 (PSW)←→D19-6 (SG) Input Waveform When refrigerant pressure is normal 10 to 16 V
    When refrigerant pressure is abnormal Less than 1 V
    D19-6 (SG) ←→Chassis ground - Resistance Always Less than 1 Ω
    D19-8 (HR)←→D19-16 (GND) Input Voltage IG ON Blower switch OFF →LO Less than 1 V →10 to 16 V
    D19-9 (+B)←→D19-16 (GND) Input Voltage Always 10 to 16 V
    D19-10 (IG)←→D19-16 (GND) Input Voltage IG ON 10 to 16 V
    D19-11 (ILL+)←→D19-16 (GND) Input Voltage Night illumination ON 10 to 16 V
    Night illumination OFF Less than 1 V
    D19-12 (CANL)←→D19-16 (GND) Input/Output Waveform IG ON Pulse generation
    D19-13 (CANH)←→D19-16 (GND) Input/Output Waveform IG ON Pulse generation
    D19-14 (BLW)←→D19-16 (GND) Output Waveform IG ON Blower switch LO Pulse generation (waveform 1)
    D19-15 (ILL-)←→D19-16 (GND) Input - IG ON Rheostat 10 to 16 V
    D19-16 (GND) ←→Chassis ground - Resistance Always Less than 1 Ω
    STANDARD VALUE SPECIFICATION - CONNECTOR D20

    Terminal No. (Terminal symbol) Input/Output Item Measuring conditions Standard value
    D20-2 (TSD) ←→Chassis ground Input Voltage IG ON
    Put sunlight or light to the sunload sensor.    		 0.8 to 4.3 V (The voltage varies depending on the light strength.)
    D20-29 (S5)←→16 (GND) Output Voltage IG ON 4.75 V to 5.25 V
    G12591569Courtesy of SUBARU OF AMERICA, INC.
    1. Waveform 1
    Item Contents
    Measuring terminal D19-14 (BLW) - D19-16 (GND)
    Equipment setting 1 V/DIV, 500 μs/DIV
    Measuring conditions IG ON, Blower switch: LO, A/C switch: ON
    NOTE: As the blower level is high (increase of air flow), the duty ratio is changed.
  2. Combination meter ASSY
    G12591570Courtesy of SUBARU OF AMERICA, INC.

    Standard value

    STANDARD VALUE SPECIFICATION - CONNECTOR D7

    Terminal No. (Terminal symbol) Input/Output Item Measuring conditions Standard value
    D7-24 (TAM) ←→D7-25 (SG-) Input Voltage IG ON
    External temperature 25°C (77°F)    		 1.4 to 1.6V
    IG ON
    External temperature 50°C (122°F)    		 0.7 to 0.9V
    D7-6 (CANH) ←→Chassis ground Input/Output Waveform IG ON Pulse generation
    D7-7 (CANL) ←→Chassis ground Input/Output Waveform IG ON Pulse generation
  3. Instrument panel junction block ASSY, main body ECM (Network gateway computer)
    G12591571Courtesy of SUBARU OF AMERICA, INC.
    1. Inspection of instrument panel junction block ASSY and main body ECM (network gateway computer)
      1. Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
      2. Check the resistance and voltage between the instrument panel junction block ASSY connector terminals.

        Standard value

        STANDARD VALUE SPECIFICATION - CONNECTOR MB

        Terminal No. (Terminal symbol) Input/Output Item Measuring conditions Standard value
        MB8 ←→Chassis ground Input Voltage IG ON 11 to 14 V
        MB9 ←→Chassis ground Input Voltage IG ACC 11 to 14 V
        MB11 ←→Chassis ground - Resistance Always Less than 1 Ω
        NOTE: If it is out of the standard value, it can be judged as malfunction of the vehicle.
  4. Engine control computer
    G12591572Courtesy of SUBARU OF AMERICA, INC.

    Standard value

    STANDARD VALUE SPECIFICATION - CONNECTOR A33

    Terminal No. (Terminal symbol) Input/Output Item Measuring conditions Standard value
    A33-8 (ACP) ←→Chassis ground Input Voltage When refrigerant pressure is normal 0.63 to 4.73V
    A33-18 (CANL) ←→Chassis ground Input/Output Waveform IG ON Pulse generation
    A33-19 (CANH) ←→Chassis ground Input/Output Waveform IG ON Pulse generation
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