AIR CONDITIONING SYSTEM TERMINALS OF ECU

  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A011Y9OE05

    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) Power switch on (IG) 11 to 14 V
    I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    I77-4 (ECOS) - I77-14 (GND) L - W-B ECO mode switch (eco switch assembly) signal

    Power switch on (IG)

    ECO mode switch (eco switch assembly): on

    		 Below 1 V
    I77-4 (ECOS) - I77-14 (GND) L - W-B ECO mode switch (eco switch assembly) signal

    Power switch on (IG)

    ECO mode switch (eco switch assembly): off

    		 11 to 14 V
    I77-5 (TAM) - I77-13 (SG-2) P - GR Ambient temperature sensor signal

    Power switch on (IG)

    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

    Power switch on (IG)

    Ambient temperature: 40°C (104°F)

    		 0.9 to 1.2 V
    I77-6 (TFG) - I77-14 (GND) B - W-B Glass temperature signal

    Power switch on (IG)

    Glass temperature: 20°C (68°F)

    		 2.200 kΩ
    I77-7 (TNG) - I77-14 (GND) V - W-B Glass surroundings temperature signal

    Power switch on (IG)

    Glass surroundings temperature: 20°C (68°F)

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

    Power switch on (READY)

    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

    Power switch on (READY)

    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

    Power switch on (READY)

    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

    Power switch on (IG)

    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

    Power switch on (IG)

    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 Always Below 1 V
    I77-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    I77-15 (PTC1) - I77-14 (GND) G - W-B Quick heater operation signal

    • Power switch on (READY)

    • ECO mode switch (eco switch assembly) off

    • Blower motor off

    • Temperature settings: MAX HOT

    • Engine coolant temperature 70°C or lower

    • Ambient temperature 10°C or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

    		 11 to 14 V
    I77-16 (PTC2) - I77-14 (GND) L - W-B Quick heater operation signal

    • Power switch on (READY)

    • ECO mode switch (eco switch assembly) off

    • Blower motor off

    • Temperature settings: MAX HOT

    • Engine coolant temperature 70°C or lower

    • Ambient temperature 10°C or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

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

    Power switch on (IG)

    Blower switch: LO

    Pulse generation

    (See waveform 1)
    I77-27 (IDH) - I77-14 (GND) SB - W-B Inverter with converter assembly current over signal Power switch on (IG) 4.75 to 5.25 V
    I77-28 (RH) - I77-14 (GND) LG - W-B Humidity sensor signal

    Power switch on (IG)

    Cabin temperature: 25°C (77°F)

    Humidity: 40%

    		 2.09 V
    I77-28 (RH) - I77-14 (GND) LG - W-B Humidity sensor signal

    Power switch on (IG)

    Cabin temperature: 25°C (77°F)

    Humidity: 60%

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

    Power switch on (IG)

    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

    Power switch on (IG)

    Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    I77-32 (TSP) - I77-14 (GND) Y - W-B Solar sensor signal (for front passenger side)

    Power switch on (IG)

    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)

    Power switch on (IG)

    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)

    Power switch on (IG)

    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)

    Power switch on (IG)

    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
    I77-35 (SG-4) - Body ground W - Body ground Ground for ECO mode switch (eco switch assembly) Always Below 1 V
    I77-37 (LIN1) - I77-14 (GND) V - W-B LIN communication signal Power switch on (IG) 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 Power switch on (IG) Pulse generation
    z1-4 (B BUS) - z1-2 (BUS G) - Power supply for BUS IC Power switch off 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

    Power switch on (IG)

    Evaporator temperature: 0°C (32°F)

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

    Power switch on (IG)

    Evaporator temperature: 15°C (59°F)

    		 0.9 to 1.3 V

    1. Waveform 1:

      A011WJVE01
      Item Content
      Terminal No. I77-22 (BLW) - I77-14 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Power switch on (IG)

      Blower switch: LO

  2. POWER MANAGEMENT CONTROL ECU Click here

  3. INVERTER WITH CONVERTER ASSEMBLY Click here

  4. AIR CONDITIONING CONTROL ASSEMBLY

    A011VIVE04

    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) Power switch off Below 1 V
    I56-2 (IG+) - I56-6 (GND) R - W-B Power source (IG) Power switch on (IG) 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 Power switch on (IG) 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