AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor) TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    B008MBCN05

    Tech Tips

    Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

    Terminal No.

    (Symbol)

    Wiring Color Terminal Description Condition Specified Condition
    F71-1 (SG-1) - Body ground LG - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    F71-2 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    F71-6 (S5-3) - F71-2 (SG-2) GR - G Power supply for air conditioner pressure sensor Ignition switch ON 4.75 to 5.25 V
    Ignition switch off Below 1 V
    F71-14 (TR) - F71-1 (SG-1) B - LG Cooler (room temp. sensor) thermistor signal
    • Ignition switch ON

    • Cabin temperature: 25°C (77°F)

    1.8 to 2.2 V

    • Ignition switch ON

    • Cabin temperature: 40°C (104°F)

    1.2 to 1.6 V
    F71-24 (PRE) - F71-2 (SG-2) V - G Air conditioner pressure sensor signal
    • Engine running

    • Air conditioning system operating

    • Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm2, 439 psi))

    4.61 V or higher

    • Engine running

    • Air conditioning system operating

    • Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm2, 26 psi))

    Below 0.74 V

    • Engine running

    • Air conditioning system operating

    • Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))

    0.74 to 4.61 V
    F73-1 (B) - F73-4 (GND) V - W-B Power source (Back-up) Always 11 to 14 V
    F73-2 (IG+) - F73-4 (GND) B - W-B Power source (IG) Ignition switch ON 11 to 14 V
    Ignition switch off Below 1 V
    F73-3 (SOL+) - F73-4 (GND) B - W-B Compressor solenoid operation signal
    • Engine running

    • Blower switch: Lo

    • A/C switch: On

    Pulse generation

    (See waveform 1)

    F73-4 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    F73-6 (BLW) - F73-4 (GND) Y - W-B Blower motor speed control signal
    • Ignition switch ON

    • Blower switch: Lo

    Pulse generation

    (See waveform 2)

    F73-11 (CANH) - F73-12 (CANL) P - SB CAN communication signal CAN communication is performed Pulse generation
    F73-14 (LIN1) - F73-4 (GND) BE - W-B LIN communication signal (Air conditioning control assembly) Ignition switch ON

    Pulse generation

    (See waveform 3)

    F73-7 (NANO) - F73-4 (GND)*1 R - W-B Ion generator sub-assembly operation signal
    • Ignition switch ON

    • Blower switch: Lo

    • "nanoe" switch: On

    Below 1 V

    • Ignition switch ON

    • Blower switch: Lo

    • "nanoe" switch: off

    11 to 14 V
    F73-26 (NAIN) - F73-4 (GND)*1 W - W-B Ion generator sub-assembly operation condition signal
    • Ignition switch ON

    • Blower switch: Lo

    • "nanoe" switch: On

    Below 1 V

    • Ignition switch ON

    • Blower switch: Lo

    • "nanoe" switch: off

    4.75 to 5.25 V
    m1-2 (BUS G) - Body ground B - Body ground Ground for BUS IC Always Below 1 V
    m1-3 (BUS) - m1-2 (BUS G) L - B BUS IC control signal Ignition switch ON

    Pulse generation

    (See waveform 4)

    m1-4 (BUSB) - m1-2 (BUS G) R - B Power supply for BUS IC Always 11 to 14 V
    m1-5 (SG-3) - Body ground GR - Body ground Ground for No. 1 cooler thermistor (evaporator temperature sensor) Always Below 1 V
    m1-6 (TE) - m1-5 (SG-3) GR - GR No. 1 cooler thermistor (evaporator temperature sensor)
    • Ignition switch ON

    • Evaporator temperature: 0°C (32°F)

    1.7 to 2.1 V

    • Ignition switch ON

    • Evaporator temperature: 15°C (59°F)

    0.9 to 1.3 V

    • *1: w/ Ion Generator


    1. A001U6TE24

      Waveform 1:

      Item Content
      Terminal No. (Symbol) F73-3 (SOL+) - F73-4 (GND)
      Tool Setting 5 V/DIV., 500 μs/DIV.
      Vehicle Condition
      • Engine running

      • Blower switch: Lo

      • A/C switch: on

    2. A001WY5N04

      Waveform 2:

      Item Content
      Terminal No. F73-6 (BLW) - F73-4 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Vehicle Condition
      • Ignition switch ON

      • Blower switch: Lo

    3. A001T4YN07

      Waveform 3:

      Item Content
      Terminal No. F73-14 (LIN1) - F73-4 (GND)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Vehicle Condition Ignition switch ON
    4. A001UPWN15

      Waveform 4:

      Item Content
      Terminal No. m1-3 (BUS) - m1-2 (BUS G)
      Tool Setting 2 V/DIV., 2 ms./DIV.
      Vehicle Condition Ignition switch ON
  2. AIR CONDITIONING CONTROL ASSEMBLY

    A001UHDN02

    Tech Tips

    Check from the rear of the connector while it is connected to the air conditioning control assembly.

    Terminal No.

    (Symbol)

    Wiring Color Terminal Description Condition Specified Condition
    F61-16 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    F61-2 (LIN1) - Body ground BE - Body ground LIN communication signal Ignition switch ON

    Pulse generation

    (See waveform 1)

    F61-10 (IG+) - F61-16 (GND) BE - W-B Power source (IG) Ignition switch off Below 1 V
    Ignition switch ON 11 to 14 V

    1. A001T4YN07

      Waveform 1:

      Item Content
      Terminal No. F61-2 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Vehicle Condition Ignition switch ON