AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) TERMINALS OF ECU

  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A011RV1E10

    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
    I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Ignition switch ON 11 to 14 V
    I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Ignition switch off Below 1 V
    I77-2 (SOL+) - I77-14 (GND) W - W-B Compressor solenoid operation signal

    Engine running

    A/C switch: on

    Blower switch: LO

    Pulse generation

    (See waveform 1)
    I77-5 (TAM) - I77-13 (SG-2) P - GR Ambient temperature sensor signal

    Ignition switch ON

    Ambient temperature: 25°C (77°F)

    		 1.35 to 1.75 V
    I77-5 (TAM) - I77-13 (SG-2) P - GR Ambient temperature sensor signal

    Ignition switch ON

    Ambient temperature: 40°C (104°F)

    		 0.9 to 1.2 V
    I77-7 (FLOQ) - I77-13 (SG-2) G - GR A/C flow sensor signal

    Ignition switch ON

    A/C switch: off

    		 3.8 to 4.2 V
    I77-7 (FLOQ) - I77-13 (SG-2) G - GR A/C flow sensor signal

    Ignition switch ON

    A/C switch: on

    Blower switch: HI

    		 0.7 to 3.8 V
    I77-8 (LOCK) - I77-14 (GND)*1 SB - W-B A/C lock sensor signal

    Engine running

    Blower switch: LO

    A/C switch: on

    Pulse generation

    (See waveform 2)
    I77-9 (PRE) - I77-13 (SG-2) R - GR Air conditioning pressure sensor signal

    Engine running

    A/C system operating

    Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.9 kgf/cm2, 439 psi))

    		 4.80 V or higher
    I77-9 (PRE) - I77-13 (SG-2) R - GR Air conditioning pressure sensor signal

    Engine running

    A/C system operating

    Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm2, 25 psi))

    		 Below 0.50 V
    I77-9 (PRE) - I77-13 (SG-2) R - GR Air conditioning pressure sensor signal

    Engine running

    A/C system operating

    Refrigerant pressure: Normal pressure (less than 3025 kPa (30.9 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 25 psi))

    		 0.50 to 4.80 V
    I77-10 (S5-3) - I77-13 (SG-2) V - GR Power supply for air conditioning pressure sensor

    Ignition switch ON

    A/C switch: on

    		 4.75 to 5.25 V
    I77-10 (S5-3) - I77-13 (SG-2) V - GR Power supply for air conditioning pressure sensor

    Ignition switch ON

    A/C switch: off

    		 Below 1 V
    I77-11 (CANH) - I77-12 (CANL) V - W CAN communication system CAN communication occurring Pulse generation
    I77-13 (SG-2) - Body ground GR - Body ground Ground for air conditioning pressure sensor, ambient temperature sensor, A/C lock sensor Always Below 1 V
    I77-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    I77-20 (MGC) - I77-14 (GND)*1 B - W-B Magnetic clutch operation signal

    Engine running

    Blower switch: LO

    A/C switch: off

    		 11 to 14 V
    I77-20 (MGC) - I77-14 (GND)*1 B - W-B Magnetic clutch operation signal

    Engine running

    Blower switch: LO

    A/C switch: on

    		 Below 1 V
    I77-21 (B) - I77-14 (GND) Y - W-B Power source (Back-up) Always 11 to 14 V
    I77-22 (BLW) - I77-14 (GND) R - W-B Blower motor speed control signal

    Ignition switch ON

    Blower switch: LO

    Pulse generation

    (See waveform 3)
    I77-29 (TR) - I77-34 (SG-1) P - LG Room temperature sensor signal

    Ignition switch ON

    Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V
    I77-29 (TR) - I77-34 (SG-1) P - LG Room temperature sensor signal

    Ignition switch ON

    Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    I77-30 (S5-1) - I77-13 (SG-2) B - GR Power supply for A/C flow sensor Ignition switch off Below 1 V
    I77-30 (S5-1) - I77-13 (SG-2) B - GR Power supply for A/C flow sensor Ignition switch ON 4.5 to 5.5 V
    I77-32 (TSP) - I77-14 (GND) Y - W-B Solar sensor signal (for Front passenger side)

    Ignition switch ON

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    I77-32 (TSP) - I77-14 (GND) Y - W-B Solar sensor signal (for Front passenger side)

    Ignition switch ON

    Solar sensor covered with a cloth

    		 Below 0.8 V
    I77-33 (TSD) - I77-14 (GND) R - W-B Solar sensor signal (for Driver side)

    Ignition switch ON

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    I77-33 (TSD) - I77-14 (GND) R - W-B Solar sensor signal (for Driver side)

    Ignition switch ON

    Solar sensor covered with a cloth

    		 Below 0.8 V
    I77-34 (SG-1) - Body ground LG - Body ground Ground for room temperature sensor Always Below 1 V
    I77-37 (LIN1) - I77-14 (GND) V - W-B LIN communication signal Ignition switch ON Pulse generation
    z1-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z1-3 (BUS) - z1-2 (BUS G) - BUS IC control signal Ignition switch ON Pulse generation
    z1-4 (B BUS) - z1-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V
    z1-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
    z1-6 (TEA) - z1-5 (SGA) - Evaporator temperature sensor signal

    Ignition switch ON

    Evaporator temperature: 0°C (32°F)

    		 1.7 to 2.1 V
    z1-6 (TEA) - z1-5 (SGA) - Evaporator temperature sensor signal

    Ignition switch ON

    Evaporator temperature: 15°C (59°F)

    		 0.9 to 1.3 V

    • *1: for 2GR-FE

    1. Waveform 1:

      A011RPWE02
      Item Content
      Terminal No. I77-2 (SOL+) - I77-14 (GND)
      Tool Setting 5 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Engine running

      A/C switch: on

      Blower switch: LO

    2. Waveform 2:

      A011UP2E01
      Item Content
      Terminal No. I77-8 (LOCK) - I77-13 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      Engine running

      Blower switch: LO

      A/C switch: on

    3. Waveform 3:

      A011S1YE01
      Item Content
      Terminal No. I77-22 (BLW) - I77-14 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Ignition switch ON

      Blower switch: LO

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A011VA3E05

    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
    I56-2 (IG+) - I56-6 (GND) R - W-B Power source (IG) Ignition switch off Below 1 V
    I56-2 (IG+) - I56-6 (GND) R - W-B Power source (IG) Ignition switch ON 11 to 14 V
    I56-6 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    I56-9 (LIN1) - Body ground V - Body ground LIN communication signal Ignition switch ON Pulse generation
    I56-11 (ILL+) - Body ground G - Body ground Illumination signal Light control switch off Below 1 V
    I56-11 (ILL+) - Body ground G - Body ground Illumination signal Light control switch tail or head position 11 to 14 V
    I56-15 (ILL-) - Body ground SB - Body ground Illumination signal Light control switch off Below 1 V
    I56-15 (ILL-) - Body ground SB - Body ground Illumination signal Light control switch tail or head position Pulse generation