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


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A001WWSN03

    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
    F72-1 (B) - Body ground V - Body ground Power source (Back-up) Always 11 to 14 V
    F72-3 (LIN1) - F72-29 (GND)

    L - W-B*4

    BE - W-B*5

    		 LIN communication signal (Air conditioning control assembly) Ignition switch ON

    Pulse generation

    (See waveform 1)
    F72-5 (IG+) - Body ground B - Body ground Power Source (IG) Ignition switch ON 11 to 14 V
    Ignition switch off Below 1 V
    F72-9 (CANH) - F72-10 (CANL) P - SB CAN communication CAN communication is performed Pulse generation
    F72-15 (SOL-) - F72-29 (GND) L - W-B Compressor solenoid operation

    • Engine running

    • Blower switch: Lo

    • A/C switch: On

    Pulse generation

    (See waveform 2)
    F72-17 (NAIN) - F72-29 (GND)*1 W - W-B Input of status of ion generator sub-assembly

    • Ignition switch ON

    • Blower switch: Off

    		 3.5 to 5 V

    • Ignition switch ON

    • Blower switch: Lo

    		 Below 2 V
    F72-19 (PTC1) - F72-29 (GND)*2 L - W-B Output for driving PTC1 heater relay

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

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

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

    • Light control switch off

    • Blower switch: Lo

    		 Below 1 V

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

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

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    F72-20 (PTC3) - F72-29 (GND)*2 BR - W-B Output for driving PTC3 heater relay

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

    • Ambient temperature: -7°C (19°F) or lower

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

    • Light control switch off

    • Blower switch: Lo

    		 Below 1 V

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

    • Ambient temperature: -7°C (19°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    F72-29 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    F72-30 (TR) - F72-31 (SG-1) B - LG Cooler (room temp. sensor) thermistor

    • Ignition switch ON

    • Cabin temperature: 25°C (77°F)

    		 1.8 to 1.6 V

    • Ignition switch ON

    • Cabin temperature: 40°C (104°F)

    		 1.0 to 0.8 V
    F72-31 (SG-1) - Body ground LG - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    F72-32 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    F72-33 (PRE) - F72-32 (SG-2)*6 V - G Input from refrigerant gas sensor

    • Ignition switch ON

    • Air conditioning system operating

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

    		 4.61 V or higher

    • Ignition switch ON

    • Air conditioning system operating

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

    		 Below 0.74 V

    • Ignition switch ON

    • 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
    F72-33 (PRE) - F72-32 (SG-2)*7 V - G Input from refrigerant gas sensor

    • Ignition switch ON

    • Air conditioning system operating

    • Refrigerant pressure: Abnormal pressure (more than 2812 kPa (28.7 kgf/cm2, 408 psi))

    		 4.61 V or higher

    • Ignition switch ON

    • Air conditioning system operating

    • Refrigerant pressure: Abnormal pressure (less than 195 kPa (2.0 kgf/cm2, 28 psi))

    		 Below 0.74 V

    • Ignition switch ON

    • Air conditioning system operating

    • Refrigerant pressure: Normal pressure (less than 2812 kPa (28.7 kgf/cm2, 408 psi) and more than 195 kPa (2.0 kgf/cm2, 28 psi))

    		 0.74 to 4.61 V
    F72-34 (S5-3) - F72-32 (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
    F72-37 (NANO) - F72-29 (GND)*1 R - W-B Output for driving ion generator sub-assembly

    • Ignition switch ON

    • Blower switch: Lo

    		 3.5 to 5 V

    • Ignition switch ON

    • Blower switch: Lo

    		 Below 2 V
    F72-39 (PTC2) - F72-29 (GND)*2 V - W-B Output for driving PTC2 heater relay

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

    • Ambient temperature: 16°C (61°F) or lower

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

    • Light control switch off

    • Blower switch: Lo

    		 Below 1 V

    • Ignition switch ON

    • ECO mode: off

    • Temperature setting: MAX HOT

    • Ambient temperature: 16°C (61°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    F7A-1 (SHUNT1) - Body ground - Set HVAC double layer

    • Ignition switch ON

    • Double Layer*3

    		 11 to 14 V

    • Ignition switch ON

    • Single Layer

    		 Below 1 V
    F7A-2 (B2AI) - Body ground - Output for driving the motor to switch inlet/outlet B2

    • Ignition switch ON

    • No. 1 blower damper servo sub-assembly (fresh/recirculation) operating

    Pulse generation

    (See waveform 3)
    F7A-3 (A2AI) - Body ground - Output for driving the motor to switch inlet/outlet A2

    • Ignition switch ON

    • No. 1 blower damper servo sub-assembly (fresh/recirculation) operating

    Pulse generation

    (See waveform 3)
    F7A-4 (A2AO) - Body ground - Output for driving the motor to switch mode A2

    • Ignition switch ON

    • No. 2 air conditioning radiator damper servo sub-assembly (mode switching) operating

    Pulse generation

    (See waveform 4)
    F7A-6 (B2AO) - Body ground - Output for driving the motor to switch mode B2

    • Ignition switch ON

    • No. 2 air conditioning radiator damper servo sub-assembly (mode switching) operating

    Pulse generation

    (See waveform 4)
    F7A-8 (B1AO) - Body ground - Output for driving the motor to switch mode B1

    • Ignition switch ON

    • No. 2 air conditioning radiator damper servo sub-assembly (mode switching) operating

    Pulse generation

    (See waveform 4)
    F7A-9 (A1AI) - Body ground - Output for driving the motor to switch inlet/outlet A1

    • Ignition switch ON

    • No. 1 blower damper servo sub-assembly (fresh/recirculation) operating

    Pulse generation

    (See waveform 3)
    F7A-10 (B1AI) - Body ground - Output for driving the motor to switch inlet/outlet B1

    • Ignition switch ON

    • No. 1 blower damper servo sub-assembly (fresh/recirculation) operating

    Pulse generation

    (See waveform 3)
    F7A-12 (BLU) - Body ground - Power supply to the air mix motor in left upper layer Ignition switch ON 11 to 14 V
    F7A-13 (BAI) - Body ground - Power supply to the motor to switch inlet/outlet Ignition switch ON 11 to 14 V
    F7A-14 (BLL) - Body ground - Power supply to the air mix motor in left lower layer Ignition switch ON 11 to 14 V
    F7A-16 (A1AO) - Body ground - Output for driving the motor to switch mode A1

    • Ignition switch ON

    • No. 2 air conditioning radiator damper servo sub-assembly (mode switching) operating

    Pulse generation

    (See waveform 4)
    F7A-18 (B2LL) - Body ground - Output for driving the air mix motor in left lower layer B2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*5

    Pulse generation

    (See waveform 5)
    F7A-19 (B1LU) - Body ground - Output for driving the air mix motor in left upper layer B1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*5

    Pulse generation

    (See waveform 6)
    F7A-20 (A1LL) - Body ground - Output for driving the air mix motor in left lower layer A1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*5

    Pulse generation

    (See waveform 5)
    F7A-21 (SHUNT2) - Body ground - Set HVAC double layer

    • Ignition switch ON

    • Double Layer*3

    		 11 to 14 V

    • Ignition switch ON

    • Single Layer

    		 Below 1 V
    F7A-22 (B1RU) - Body ground - Output for driving the air mix motor in right upper layer B1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*5

    Pulse generation

    (See waveform 8)
    F7A-23 (A2RL) - Body ground - Output for driving the air mix motor in right lower layer A2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*5

    Pulse generation

    (See waveform 7)
    F7A-24 (A1RU) - Body ground - Output for driving the air mix motor in right upper layer A1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*5

    Pulse generation

    (See waveform 8)
    F7A-25 (B2RL) - Body ground - Output for driving the air mix motor in right lower layer B2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*5

    Pulse generation

    (See waveform 7)
    F7A-26 (B1RL) - Body ground - Output for driving the air mix motor in right lower layer B1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*5

    Pulse generation

    (See waveform 7)
    F7A-27 (A2RU) - Body ground - Output for driving the air mix motor in right upper layer A2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*5

    Pulse generation

    (See waveform 8)
    F7A-28 (A1RL) - Body ground - Output for driving the air mix motor in right lower layer A1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*5

    Pulse generation

    (See waveform 7)
    F7A-29 (B2RU) - Body ground - Output for driving the air mix motor in right upper layer B2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*5

    Pulse generation

    (See waveform 8)
    F7A-30 (A2LU) - Body ground - Output for driving the air mix motor in left upper layer A2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*5

    Pulse generation

    (See waveform 6)
    F7A-31 (B2LU) - Body ground - Output for driving the air mix motor in left upper layer B

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*5

    Pulse generation

    (See waveform 6)
    F7A-32 (BAO) - Body ground - Power supply to the motor to switch mode Ignition switch ON 11 to 14 V
    F7A-33 (BRU) - Body ground - Power supply to the air mix motor in right upper layer Ignition switch ON 11 to 14 V
    F7A-34 (BRL) - Body ground - Power supply to the air mix motor in right lower layer Ignition switch ON 11 to 14 V
    F7A-35 (B1LL) - Body ground - Output for driving the air mix motor in left lower layer B1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*5

    Pulse generation

    (See waveform 5)
    F7A-36 (A1LU) - Body ground - Output for driving the air mix motor in left upper layer A1

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*5

    Pulse generation

    (See waveform 6)
    F7A-37 (A2LL) - Body ground - Output for driving the air mix motor in left lower layer A2

    • Ignition switch ON

    • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*4

    • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*5

    Pulse generation

    (See waveform 5)
    F7A-38 (TEA) - F7A-39 (SGA) - Input No. 1 cooler thermistor

    • Ignition switch ON

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

    		 0.5 V

    • Ignition switch ON

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

    		 1.6 V
    F7A-39 (SGA) - Body ground - Ground for No. 1 cooler thermistor Always Below 1 V
    F7A-40 (BLW) - F72-29 (GND) - Output for driving Blower motor

    • Ignition switch ON

    • Blower switch: Lo

    Pulse generation

    (See waveform 9)

    • *1: w/ Ion Generator

    • *2: w/ PTC Heater

    • *3: w/ Headlight Cleaner System

    • *4: for LHD

    • *5: for RHD

    • *6: for HFC-134a (R134a)

    • *7: for HFO-1234yf (R1234yf)


    1. A001T4YN04

      Waveform 1:

      Item Content
      Terminal No. F72-3 (LIN1) - F72-29 (GND)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Vehicle Condition Ignition switch ON
    2. A001WY5N02

      Waveform 2:

      Item Content
      Terminal No. F72-15 (SOL-) - F72-29 (GND)
      Tool Setting 5 V/DIV., 1 ms./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: Lo

      • A/C switch: On
    3. A001TZ3N01

      Waveform 3:

      Item Content
      Terminal No. F7A-2 (B2AI) - Body ground
      F7A-3 (A2AI) - Body ground
      F7A-9 (A1AI) - Body ground
      F7A-10 (B1AI) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 1 blower damper servo sub-assembly (fresh/recirculation) operating
    4. A001TZ3N05

      Waveform 4:

      Item Content
      Terminal No. F7A-4 (A2AO) - Body ground
      F7A-6 (B2AO) - Body ground
      F7A-8 (B1AO) - Body ground
      F7A-16 (A1AO) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 2 air conditioning radiator damper servo sub-assembly (mode switching) operating
    5. A001TZ3N06

      Waveform 5:

      Item Content
      Terminal No. F7A-18 (B2LL) - Body ground
      F7A-20 (A1LL) - Body ground
      F7A-35 (B1LL) - Body ground
      F7A-37 (A2LL) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*1

      • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*2

      • *1: LHD

      • *2: RHD

    6. A001TZ3N07

      Waveform 6:

      Item Content
      Terminal No. F7A-19 (B1LU) - Body ground
      F7A-30 (A2LU) - Body ground
      F7A-31 (B2LU) - Body ground
      F7A-36 (A1LU) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*1

      • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*2

      • *1: LHD

      • *2: RHD

    7. A001TZ3N08

      Waveform 7:

      Item Content
      Terminal No. F7A-23 (A2RL) - Body ground
      F7A-25 (B2RL) - Body ground
      F7A-26 (B1RL) - Body ground
      F7A-28 (A1RL) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operating*1

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) operating*2

      • *1: LHD

      • *2: RHD

    8. A001TZ3N09

      Waveform 8:

      Item Content
      Terminal No. F7A-22 (B1RU) - Body ground
      F7A-24 (A1RU) - Body ground
      F7A-27 (A2RU) - Body ground
      F7A-29 (B2RU) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • No. 1 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operating*1

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operating*2

      • *1: LHD

      • *2: RHD

    9. A001WY5N03

      Waveform 9:

      Item Content
      Terminal No. F7A-40 (BLW) - F72-29 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Vehicle Condition

      • Ignition switch ON

      • Blower switch: Lo

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A001UHDN01

    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
    F61-2 (LIN1) - Body ground L - Body ground LIN communication Ignition switch ON Pulse generation (See waveform 1)
    F61-10 (IG+) - Body ground BE - Body ground Power source (IG) Ignition switch off Below 1 V
    Ignition switch ON 11 to 14 V
    F61-16 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V

    1. A001T4YN09

      Waveform 1:

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