AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY (w/o Rear Air Conditioning System)

    B005N93C01
    *A w/o Seat Heater *B w/ Seat Heater

    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
    J42-1 (SG-1) - Body ground L - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    J42-2 (SG-2) - Body ground B - Body ground Ground for cooler (ambient temp. sensor) thermistor, A/C lock sensor*3, smog ventilation sensor*2 Always Below 1 V
    J42-3 (SG-4) - Body ground BE - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    J42-6 (S5-3) - J42-2 (SG-2) W - B Power supply for air conditioner pressure sensor Engine switch on (IG) 4.75 to 5.25 V
    Engine switch off Below 1 V
    J42-9 (MGC) - J43-4 (GND)*3 R - W-B 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
    J42-10 (PTC2) - J43-4 (GND)*1 G - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: 0°C (32°F) or lower

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

    • Light control switch off

    • Blower switch: On

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: 0°C (32°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    J42-11 (PTC3) - J43-4 (GND)*1 Y - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: -10°C (14°F) or lower

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

    • Light control switch off

    • Blower switch: On

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: -10°C (14°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    J42-13 (TAM) - J42-2 (SG-2) G - B Cooler (ambient temp. sensor) thermistor signal

    • Engine switch on (IG)

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

    		 1.35 to 1.75 V

    • Engine switch on (IG)

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

    		 0.9 to 1.2 V
    J42-14 (TR) - J42-1 (SG-1) P - L Cooler (room temp. sensor) thermistor signal

    • Engine switch on (IG)

    • Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V

    • Engine switch on (IG)

    • Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    J42-20 (ECOS) - J43-4 (GND) V - W-B Combination switch assembly (ECO mode switch) signal

    • Engine switch on (IG)

    • Combination switch assembly (ECO mode switch) off

    		 11 to 14 V

    • Engine switch on (IG)

    • Combination switch assembly (ECO mode switch) on

    		 Below 1 V
    J42-21 (LOCK) - J42-2 (SG-2)*3 B - B A/C lock sensor signal

    • Engine running

    • Blower switch: LO

    • A/C switch: On

    		 Pulse generation (See waveform 1)
    J42-24 (PRE) - J42-3 (SG-4) L - BE Air conditioner pressure sensor signal

    • Engine running

    • Air conditioning system operating

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

    		 4.61 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 4.61 V
    J42-25 (DGS) - J42-2 (SG-2)*2 LG - B Smog ventilation sensor signal (HC, CO) 28 seconds after engine switch turned on (IG) and sensor exposed to exhaust gas (HC, CO) 1.0 to 4.5 V
    J42-27 (DGS1) - J42-2 (SG-2)*2 GR - B Smog ventilation sensor signal (NOx) 120 seconds after engine switch turned on (IG) and sensor exposed to exhaust gas (NOx) 1.0 to 4.5 V
    J43-1 (B) - J43-4 (GND) R - W-B Power source (Back-up) Always 11 to 14 V
    J43-2 (IG+) - J43-4 (GND) GR - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
    Engine switch off Below 1 V
    J43-3 (SOL+) - J43-4 (GND) SB - W-B Compressor solenoid operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: On

    Pulse generation

    (See waveform 2)
    J43-4 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    J43-6 (BLW) - J43-4 (GND) L - W-B Blower motor speed control signal

    • Engine switch on (IG)

    • Blower switch: LO

    Pulse generation

    (See waveform 3)
    J43-7 (NANO) - J43-4 (GND)*4 BE - W-B Ion generator sub-assembly operation signal

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: On

    		 Below 1 V

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: Off

    		 4.75 to 5.25 V
    J43-11 (CANH) - J43-12 (CANL) LG - W CAN communication system CAN communication is performed Pulse generation
    J43-18 (PTC1) - J43-4 (GND)*1 LG - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • 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

    • Combination switch assembly (ECO mode switch) off

    • 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
    J43-26 (NAIN) - J43-4 (GND)*4 LG - W-B Ion generator sub-assembly operation condition signal

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: On

    		 Below 1 V

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: Off

    		 4.75 to 5.25 V
    z3-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z3-3 (BUS) - z3-2 (BUS G) - BUS IC control signal Engine switch on (IG) Pulse generation
    z3-4 (B BUS) - z3-2 (BUS G) - Power supply for BUS IC Always 11 to 14 V
    z3-5 (SG) - Body ground - Ground for No. 1 cooler thermistor Always Below 1 V
    z3-6 (TE) - z3-5 (SG) - No. 1 cooler thermistor signal

    • Engine switch on (IG)

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

    		 1.7 to 2.1 V

    • Engine switch on (IG)

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

    		 0.9 to 1.3 V

    • *1: w/ PTC Heater

    • *2: w/ Smog Ventilation Sensor

    • *3: w/o Stop and Start System

    • *4: w/ Ion Generator


    1. B005Q50N06

      Waveform 1:

      Item Content
      Terminal No. J42-21 (LOCK) - J42-2 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
    2. B005Q44N07

      Waveform 2:

      Item Content
      Terminal No. J43-3 (SOL+) - J43-4 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
    3. B005PHQN01

      Waveform 3:

      Item Content
      Terminal No. J43-6 (BLW) - J43-4 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Blower switch: LO

  2. AIR CONDITIONING AMPLIFIER ASSEMBLY (w/ Rear Air Conditioning System)

    B005OYUN02

    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
    J42-1 (SG-1) - Body ground L - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    J42-2 (SG-2) - Body ground B - Body ground Ground for cooler (ambient temp. sensor) thermistor, A/C lock sensor, smog ventilation sensor*2 Always Below 1 V
    J42-3 (SG-4) - Body ground BE - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    J42-6 (S5-3) - J42-2 (SG-2) W - B Power supply for air conditioner pressure sensor Engine switch on (IG) 4.75 to 5.25 V
    Engine switch off Below 1 V
    J42-9 (MGC) - J43-4 (GND) R - W-B 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
    J42-10 (PTC2) - J43-4 (GND)*1 G - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: 0°C (32°F) or lower

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

    • Light control switch off

    • Blower switch: On

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: 0°C (32°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    J42-11 (PTC3) - J43-4 (GND)*1 Y - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: -10°C (14°F) or lower

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

    • Light control switch off

    • Blower switch: On

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature setting: MAX HOT

    • Ambient temperature: -10°C (14°F) or lower

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

    • Light control switch off

    • Blower switch: Off

    		 11 to 14 V
    J42-13 (TAM) - J42-2 (SG-2) G - B Cooler (ambient temp. sensor) thermistor signal

    • Engine switch on (IG)

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

    		 1.35 to 1.75 V

    • Engine switch on (IG)

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

    		 0.9 to 1.2 V
    J42-14 (TR) - J42-1 (SG-1) P - L Cooler (room temp. sensor) thermistor signal

    • Engine switch on (IG)

    • Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V

    • Engine switch on (IG)

    • Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    J42-20 (ECOS) - J43-4 (GND) V - W-B Combination switch assembly (ECO mode switch) signal

    • Engine switch on (IG)

    • Combination switch assembly (ECO mode switch) off

    		 11 to 14 V

    • Engine switch on (IG)

    • Combination switch assembly (ECO mode switch) on

    		 Below 1 V
    J42-21 (LOCK) - J42-2 (SG-2) B - B A/C lock sensor signal

    • Engine running

    • Blower switch: LO

    • A/C switch: On

    		 Pulse generation (See waveform 1)
    J42-24 (PRE) - J42-3 (SG-4) L - BE Air conditioner pressure sensor signal

    • Engine running

    • Air conditioning system operating

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

    		 4.61 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 4.61 V
    J42-25 (DGS) - J42-2 (SG-2)*2 LG - B Smog ventilation sensor signal (HC, CO) 28 seconds after engine switch turned on (IG) and sensor exposed to exhaust gas (HC, CO) 1.0 to 4.5 V
    J42-27 (DGS1) - J42-2 (SG-2)*2 GR - B Smog ventilation sensor signal (NOx) 120 seconds after engine switch turned on (IG) and sensor exposed to exhaust gas (NOx) 1.0 to 4.5 V
    J43-1 (B) - J43-4 (GND) R - W-B Power source (Back-up) Always 11 to 14 V
    J43-2 (IG+) - J43-4 (GND) GR - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
    Engine switch off Below 1 V
    J43-3 (SOL+) - J43-4 (GND) SB - W-B Compressor solenoid operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: On

    Pulse generation

    (See waveform 2)
    J43-4 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    J43-6 (BLW) - J43-4 (GND) L - W-B Blower motor speed control signal

    • Engine switch on (IG)

    • Blower switch: LO

    Pulse generation

    (See waveform 3)
    J43-7 (NANO) - J43-4 (GND)*3 BE - W-B Ion generator sub-assembly operation signal

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: On

    		 Below 1 V

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: Off

    		 4.75 to 5.25 V
    J43-11 (CANH) - J43-12 (CANL) LG - W CAN communication system CAN communication is performed Pulse generation
    J43-16 (LIN3) - J43-4 (GND) W - W-B LIN communication signal Engine switch on (IG) Pulse generation
    J43-18 (PTC1) - J43-4 (GND)*1 LG - W-B Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • 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

    • Combination switch assembly (ECO mode switch) off

    • 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
    J43-26 (NAIN) - J43-4 (GND)*3 LG - W-B Ion generator sub-assembly operation condition signal

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: On

    		 Below 1 V

    • Engine switch on (IG)

    • Blower switch: LO

    • "nanoe" switch: Off

    		 4.75 to 5.25 V
    J48-1 (GND2) - Body ground W-B - Body ground Ground for rear power supply Always Below 1 V
    J48-2 (RBUG) - Body ground GR - Body ground Ground for BUS IC (for Rear side) Always Below 1 V
    J48-3 (RBBU) - Body ground LG - Body ground Power supply for BUS IC (for Rear side) Always 11 to 14 V
    J48-4 (+B2) - Body ground L - Body ground Rear power source (Back-up) Always 11 to 14 V
    J48-6 (TR) - J48-20 (SG-7) R - G Cooler (No. 2 room temp. sensor) thermistor signal

    • Engine switch on (IG)

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

    		 1.8 to 2.2 V

    • Engine switch on (IG)

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

    		 1.2 to 1.6 V
    J48-8 (TEC) - J48-21 (SG-8) R - V Rear evaporator temperature sensor signal

    • Engine switch on (IG)

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

    		 2.0 to 2.4 V

    • Engine switch on (IG)

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

    		 1.4 to 1.8 V
    J48-12 (BLWH) - Body ground V - Body ground Rear blower motor speed control signal

    • Engine switch on (IG)

    • Rear blower switch: LO

    Pulse generation

    (See waveform 4)
    J48-20 (SG-7) - Body ground G - Body ground Ground for cooler (No. 2 room temp. sensor) thermistor Always Below 1 V
    J48-21 (SG-8) - Body ground V - Body ground Ground for rear evaporator temperature sensor Always Below 1 V
    J48-22 (RBUS) - J48-2 (RBUG) SB - GR BUS IC control signal (for Rear side) Engine switch on (IG) Pulse generation
    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) Engine switch on (IG) 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 (SG) - Body ground - Ground for No. 1 cooler thermistor Always Below 1 V
    z3-6 (TE) - z3-5 (SG) - No. 1 cooler thermistor signal

    • Engine switch on (IG)

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

    		 1.7 to 2.1 V

    • Engine switch on (IG)

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

    		 0.9 to 1.3 V

    • *1: w/ PTC Heater

    • *2: w/ Smog Ventilation Sensor

    • *3: w/ Ion Generator


    1. B005Q50N06

      Waveform 1:

      Item Content
      Terminal No. J42-21 (LOCK) - J42-2 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
    2. B005Q44N07

      Waveform 2:

      Item Content
      Terminal No. J43-3 (SOL+) - J43-4 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
    3. B005PHQN01

      Waveform 3:

      Item Content
      Terminal No. J43-6 (BLW) - J43-4 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Blower switch: LO
    4. B005PL0N01

      Waveform 4:

      Item Content
      Terminal No. J48-12 (BLWH) - Body ground
      Tool Setting 2 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Rear blower switch: LO

  3. NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (w/ Rear Air Conditioning System)

    B005LTFN02

    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
    S90-2 (IG) - S90-4 (E) LG - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
    Engine switch off Below 1 V
    S90-4 (E) - Body ground W-B - Body ground Ground for No. 2 air conditioning control assembly Always Below 1 V
    S90-6 (BLIN) - S90-4 (E) G - W-B LIN communication signal Engine switch on (IG) Pulse generation

  4. RADIO RECEIVER ASSEMBLY (A/C CONTROL PANEL)

    w/ Navigation System: Click here

    w/ Audio and Visual System (for 12.3 Inch Display): Click here

    w/ Audio and Visual System (for 8 Inch Display): Click here

  5. MULTI-DISPLAY ASSEMBLY (for 8 Inch Display)

    w/ Navigation System: Click here

    w/ Audio and Visual System: Click here

  6. ACCESSORY METER ASSEMBLY (for 12.3 Inch Display)

    w/ Navigation System: Click here

    w/ Audio and Visual System: Click here