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


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A0026ZAN01

    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
    F80-1 (IG+) - F80-14 (GND) V - BR Power source (IG) Ignition switch ON 11 to 14 V
    Ignition switch off Below 1 V
    F80-2 (SOL+) - F80-14 (GND) R - BR Compressor solenoid operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: on

    Pulse generation

    (See waveform 1)
    F80-3 (PTC2) - F80-14 (GND)*1 G - BR Quick heater assembly operation signal

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 70°C (158°F) or lower

    • Light control switch off

    • Blower switch: on

    		 Below 1 V

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 70°C (158°F) or lower

    • Light control switch off

    • Blower switch: off

    		 11 to 14 V
    F80-5 (TAM) - F80-13 (SG-2) W - L Thermistor assembly signal

    • Ignition switch ON

    • Ambient temperature: 25°C (77°F)

    		 1.35 to 1.75 V

    • Ignition switch ON

    • Ambient temperature: 40°C (104°F)

    		 0.9 to 1.2 V
    F80-8 (LOCK) - F80-13 (SG-2)*2 G - L A/C lock sensor signal

    • Engine running

    • Blower switch: LO

    • A/C switch: on

    		 Pulse generation (See waveform 2)
    F80-9 (PRE) - F80-13 (SG-2) SB - L Air conditioner tube and accessory assembly signal

    • Engine running

    • Air conditioning system operating

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

    		 4.71 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 4.71 V
    F80-10 (S5-3) - F80-13 (SG-2) GR - L Power supply for air conditioner tube and accessory assembly Ignition switch ON 4.75 to 5.25 V
    Ignition switch off Below 1 V
    F80-11 (CANH) - F80-12 (CANL) BE - W CAN communication system CAN communication is performed Pulse generation
    F80-13 (SG-2) - Body ground L - Body ground Ground for air conditioner tube and accessory assembly, thermistor assembly, A/C lock sensor*2 Always Below 1 V
    F80-14 (GND) - Body ground BR - Body ground Ground for main power supply Always Below 1 V
    F80-20 (MGC) - F80-14 (GND)*2 LG - BR Magnetic clutch operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: off

    		 11 to 14 V

    • Engine running

    • Blower switch: LO

    • A/C switch: on

    		 Below 1 V
    F80-21 (B) - F80-14 (GND) P - BR Power source (Back-up) Always 11 to 14 V
    F80-22 (BLW) - F80-14 (GND) Y - BR Blower motor speed control signal

    • Ignition switch ON

    • Blower switch: LO

    Pulse generation

    (See waveform 3)
    F80-29 (TR) - F80-34 (SG-4) BR - 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
    F80-34 (SG-4) - Body ground LG - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    F80-36 (PTC3) - F80-14 (GND)*1 Y - BR Quick heater assembly operation signal

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 65°C (149°F) or lower

    • Light control switch off

    • Blower switch: on

    		 Below 1 V

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 65°C (149°F) or lower

    • Light control switch off

    • Blower switch: off

    		 11 to 14 V
    F80-37 (LIN1) - F80-14 (GND) BE - BR LIN communication signal (for Front side) Ignition switch ON Pulse generation
    F80-40 (PTC1) - F80-14 (GND)*1 L - BR Quick heater assembly operation signal

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 75°C (167°F) or lower

    • Light control switch off

    • Blower switch: on

    		 Below 1 V

    • Engine running

    • Temperature setting: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 75°C (167°F) or lower

    • Light control switch off

    • Blower switch: off

    		 11 to 14 V
    F81-1 (R BUS) - F81-25 (R BUG) B - GR Power supply for BUS IC (for Rear side) Always 11 to 14 V
    F81-5 (TEC) - F81-7 (SGND) BE - BR Rear evaporator temperature sensor signal

    • Ignition switch ON

    • Rear evaporator temperature: 0°C (32°F)

    		 2.0 to 2.4 V

    • Ignition switch ON

    • Rear evaporator temperature: 15°C (59°F)

    		 1.4 to 1.8 V
    F81-7 (SGND) - Body ground BR - Body ground Ground for rear evaporator temperature sensor Always Below 1 V
    F81-8 (RGND) - Body ground L - Body ground Ground for cooler (No. 2 room temp. sensor) thermistor Always Below 1 V
    F81-16 (RLIN) - F81-24 (GND2) L - BR LIN communication signal (for Rear side) Ignition switch ON Pulse generation
    F81-20 (TR) - F81-8 (RGND) P - L Cooler (No. 2 room temp. sensor) thermistor signal

    • Ignition switch ON

    • Rear cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V

    • Ignition switch ON

    • Rear cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    F81-24 (GND2) - Body ground BR - Body ground Ground for rear power supply Always Below 1 V
    F81-25 (R BUG) - Body ground GR - Body ground Ground for BUS IC (for Rear side) Always Below 1 V
    F81-26 (BLWH) - F81-24 (GND2) Y - BR Rear blower motor speed control signal

    • Ignition switch ON

    • Rear blower switch: LO

    Pulse generation

    (See waveform 4)
    F81-27 (R BBU) - F81-25 (R BUG) R - GR BUS IC control signal (for Rear side) Ignition switch ON Pulse generation
    F81-28 (+B2) - F81-24 (GND2) P - BR Rear power source (Back-up) Always 11 to 14 V
    z3-2 (BUS G) - Body ground - Ground for BUS IC (for Front side) Always Below 1 V
    z3-3 (BUS) - z3-2 (BUS G) - BUS IC control signal (for Front side) Ignition switch ON Pulse generation
    z3-4 (B BUS) - z3-2 (BUS G) - Power supply for BUS IC (for Front side) Always 11 to 14 V
    z3-5 (SGA) - Body ground - Ground for No. 1 cooler thermistor Always Below 1 V
    z3-6 (TEA) - z3-5 (SGA) - No. 1 cooler thermistor signal

    • Ignition switch ON

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

    		 2.0 to 2.4 V

    • Ignition switch ON

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

    		 1.4 to 1.8 V

    • *1: w/ PTC Heater

    • *2: for 2GR-FKS


    1. A0028TCN07

      Waveform 1:

      Item Content
      Terminal No. F80-2 (SOL+) - F80-14 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: on
    2. A002BEBN06

      Waveform 2:

      Item Content
      Terminal No. F80-8 (LOCK) - F80-13 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: on
    3. A002BV7N01

      Waveform 3:

      Item Content
      Terminal No. F80-22 (BLW) - F80-14 (GND)
      Tool Setting 1 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Ignition switch ON

      • Blower switch: LO
    4. A002BV7N01

      Waveform 4:

      Item Content
      Terminal No. F81-26 (BLWH) - F81-24 (GND2)
      Tool Setting 1 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Ignition switch ON

      • Rear blower switch: LO

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A0027AJN14

    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
    F32-1 (ILL-) - Body ground W - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position Pulse generation
    F32-3 (ILL+) - Body ground R - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position 11 to 14 V
    F32-4 (IG+) - F32-5 (GND) V - BR Power source (IG) Ignition switch off Below 1 V
    Ignition switch ON 11 to 14 V
    F32-5 (GND) - Body ground BR - Body ground Ground for air conditioning control assembly Always Below 1 V
    F32-8 (LIN1) - Body ground BE - Body ground LIN communication signal (for Front side) Ignition switch ON Pulse generation

  3. NO. 2 AIR CONDITIONING CONTROL ASSEMBLY

    A0029FFN01

    Tech Tips

    Check from the rear of the connector while it is connected to the No. 2 air conditioning control assembly.

    Terminal No.

    (Symbol)

    		 Wiring Color Terminal Description Condition Specified Condition
    U1-1 (ILL-) - Body ground W - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position Pulse generation
    U1-5 (ILL+) - Body ground R - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position 11 to 14 V
    U1-6 (IG) - U1-7 (E) V - W-B Power source (IG) Ignition switch off Below 1 V
    Ignition switch ON 11 to 14 V
    U1-7 (E) - Body ground W-B - Body ground Ground for No. 2 air conditioning control assembly Always Below 1 V
    U1-12 (RLIN) - U1-7 (E) L - W-B LIN communication signal (for Rear side) Ignition switch ON Pulse generation