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


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A00YW55N12

    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
    G81-1 (IG+) - Body ground GR - Body ground Power source (IG) Ignition switch ON 11 to 14 V
    G81-1 (IG+) - Body ground GR - Body ground Power source (IG) Ignition switch off Below 1 V
    G81-2 (SOL+) - Body ground BR - Body ground Compressor solenoid operation signal

    Engine running

    A/C switch on

    Blower switch LO

    Pulse generation

    (See waveform 1)
    G81-3 (PTC2) - Body ground*1 GR - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 65°C or less

    Light control switch assembly off

    Blower switch on

    		 Below 1 V
    G81-3 (PTC2) - Body ground*1 GR - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 65°C or less

    Light control switch assembly off

    Blower switch off

    		 11 to 14 V
    G81-8 (LOCK) - Body ground*3 W - Body ground Air conditioning lock sensor signal

    Engine running

    Blower switch LO

    A/C switch on

    Pulse generation

    (See waveform 2)
    G81-9 (PRE) - G81-13 (SG-2) BE - G Air conditioner pressure sensor signal

    Engine running

    Air conditioning system operating

    Refrigerant pressure: Abnormal pressure (higher than 3025 kPa [30.8 kgf/cm2, 439 psi])

    		 4.73 V or higher
    G81-9 (PRE) - G81-13 (SG-2) BE - G Air conditioner pressure sensor signal

    Engine running

    Air conditioning system operating

    Refrigerant pressure: Abnormal pressure (below 176 kPa [1.8 kgf/cm2, 26 psi])

    		 Below 0.62 V
    G81-9 (PRE) - G81-13 (SG-2) BE - G Air conditioner pressure sensor signal

    Engine running

    Air conditioning system operating

    Refrigerant pressure: Normal pressure (below 3025 kPa [30.8 kgf/cm2, 439 psi] and higher than 176 kPa [1.8 kgf/cm2, 26 psi])

    		 0.62 to 4.73 V
    G81-10 (S5-3) - G81-13 (SG-2) B - G Power supply for air conditioner pressure sensor

    Ignition switch ON

    A/C switch on

    		 4.75 to 5.25 V
    G81-10 (S5-3) - G81-13 (SG-2) B - G Power supply for air conditioner pressure sensor

    Ignition switch ON

    A/C switch off

    		 Below 1 V
    G81-11 (CANH) B CAN communication line - -
    G81-12 (CANL) W CAN communication line - -
    G81-13 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor, ambient temperature sensor, air conditioning lock sensor Always Below 1 V
    G81-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
    G81-20 (MGC) - Body ground*3 V - Body ground Magnet clutch operation signal

    Engine running

    Blower switch LO

    A/C switch off

    		 11 to 14 V
    G81-20 (MGC) - Body ground*3 V - Body ground Magnet clutch operation signal

    Engine running

    Blower switch LO

    A/C switch on

    		 Below 1 V
    G81-21 (B) - Body ground GR - Body ground Power source (Back-up) Always 11 to 14 V
    G81-22 (BLW) - Body ground R - Body ground Blower motor speed control signal

    Ignition switch ON

    Blower switch LO

    Pulse generation

    (See waveform 3)
    G81-24 (ECOS) - Body ground*2 R - Body ground Combination switch assembly (ECO mode switch) signal

    Ignition switch ON

    Combination switch assembly (ECO mode switch) on

    		 Below 1 V
    G81-24 (ECOS) - Body ground*2 R - Body ground Combination switch assembly (ECO mode switch) signal

    Ignition switch ON

    Combination switch assembly (ECO mode switch) off

    		 11 to 14 V
    G81-29 (TR) - G81-34 (SG-1) GR - V Room temperature sensor signal

    Ignition switch ON

    Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V
    G81-29 (TR) - G81-34 (SG-1) GR - V Room temperature sensor signal

    Ignition switch ON

    Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    G81-32 (TSP) - Body ground P - Body ground Solar sensor signal (for Front passenger side)

    Ignition switch ON

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    G81-32 (TSP) - Body ground P - Body ground Solar sensor signal (for Front passenger side)

    Ignition switch ON

    Solar sensor covered with a cloth

    		 Below 0.8 V
    G81-33 (TSD) - Body ground L - Body ground Solar sensor signal (for Driver side)

    Ignition switch ON

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    G81-33 (TSD) - Body ground L - Body ground Solar sensor signal (for Driver side)

    Ignition switch ON

    Solar sensor covered with a cloth

    		 Below 0.8 V
    G81-34 (SG-1) - Body ground V - Body ground Ground for room temperature sensor Always Below 1 V
    G81-37 (LIN1) - Body ground B - Body ground LIN communication signal Ignition switch ON Pulse generation
    G81-39 (PTC3) - Body ground*1 R - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 70°C or less

    Light control switch assembly off

    Blower switch on

    		 Below 1 V
    G81-39 (PTC3) - Body ground*1 R - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 70°C or less

    Light control switch assembly off

    Blower switch off

    		 11 to 14 V
    G81-40 (PTC1) - Body ground*1 BR - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 75°C or less

    Light control switch assembly off

    Blower switch on

    		 Below 1 V
    G81-40 (PTC1) - Body ground*1 BR - Body ground Quick heater assembly operation signal

    Engine running Temperature setting: MAX HOT

    Ambient temperature: 10°C or less

    Engine coolant temperature: 75°C or less

    Light control switch assembly off

    Blower switch off

    		 11 to 14 V
    z7-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z7-3 (BUS) - z7-2 (BUS G) - BUS IC control signal Ignition switch ON Pulse generation
    z7-4 (B BUS) - z7-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V
    z7-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
    z7-6 (TEA) - z7-5 (SGA) - Evaporator temperature sensor signal

    Ignition switch ON

    Evaporator temperature: 0°C (32°F)

    		 1.7 to 2.1 V
    z7-6 (TEA) - z7-5 (SGA) - Evaporator temperature sensor signal

    Ignition switch ON

    Evaporator temperature: 15°C (59°F)

    		 0.9 to 1.3 V

    *1: w/ PTC Heater

    *2: w/ Stop and Start System

    *3: w/ Magnet Clutch


    1. A00YVXNN02

      Waveform 1:

      Item Content
      Terminal No. G81-2 (SOL+) - Body ground
      Tool Setting 5 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Engine running

      A/C switch on

      Blower switch LO
    2. A00YTIYN04

      Waveform 2:

      Item Content
      Terminal No. G81-8 (LOCK) - G81-13 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      Engine running

      Blower switch LO

      A/C switch on
    3. A00YUB2N16

      Waveform 3:

      Item Content
      Terminal No. G81-22 (BLW) - Body ground
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Ignition switch ON

      Blower switch LO

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A00YXYWN01

    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
    G20-1 (ILL-) - Body ground BR - Body ground Illumination signal Light control switch off Below 1 V
    G20-1 (ILL-) - Body ground BR - Body ground Illumination signal Light control switch tail or head position Below 1 V
    G20-4 (ILL+) - Body ground V - Body ground Illumination signal Light control switch off Below 1 V
    G20-4 (ILL+) - Body ground V - Body ground Illumination signal Light control switch tail or head position 11 to 14 V
    G20-5 (GND) - Body ground BR - Body ground Ground for air conditioning control assembly Always Below 1 Ω
    G20-6 (LIN1) - Body ground B - Body ground LIN communication signal Ignition switch ON Pulse generation
    G20-8 (IG+) - Body ground BE - Body ground Power source (IG) Ignition switch ON 11 to 14 V
    G20-8 (IG+) - Body ground BE - Body ground Power source (IG) Ignition switch off Below 1 V