AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    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

    		 11 to 14 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. 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

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

    w/ Navigation System: Click here

    w/ Audio and Visual System: Click here

  4. ACCESSORY METER ASSEMBLY (for 12.3 Inch Display)

    w/ Navigation System: Click here

    w/ Audio and Visual System: Click here