AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01VS31N26

    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
    O9-1 (GND) - Body ground BR - Body ground Ground for main power supply Always Below 1 V
    O9-3 (BLW) - O9-1 (GND) BE - BR Blower motor speed control signal

    • Engine switch on (IG)

    • Blower switch: LO

    Pulse generation

    (See waveform 1)
    O9-4 (SOL+) - O9-1 (GND) P - BR Compressor solenoid operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: on

    Pulse generation

    (See waveform 2)
    O9-5 (IG+) - O9-1 (GND) R - BR Power source (IG) Engine switch on (IG) 11 to 14 V
    Engine switch off Below 1 V
    O9-6 (+B1) - O9-1 (GND) L - BR Power source (Back-up) Always 11 to 14 V
    O9-8 (PTC1) - O9-1 (GND)*1 R - BR Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 3 °C (37°F) or lower

    • Engine coolant temperature: 72 °C (162°F) or lower

    • Light control switch off

    • Blower switch: on

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 3 °C (37°F) or lower

    • Engine coolant temperature: 72 °C (162°F) or lower

    • Light control switch off

    • Blower switch: off

    		 11 to 14 V
    O9-18 (MGC) - O9-1 (GND) Y - 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
    O9-21 (RLIN) - O9-1 (GND) P - BR LIN communication signal Engine switch on (IG) Pulse generation
    O9-26 (PTC2) - O9-1 (GND)*1 L - BR Quick heater assembly operation signal

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 3 °C (37°F) or lower

    • Engine coolant temperature: 69 °C (156°F) or lower

    • Light control switch off

    • Blower switch: on

    		 Below 1 V

    • Engine running

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 3 °C (37°F) or lower

    • Engine coolant temperature: 69 °C (156°F) or lower

    • Light control switch off

    • Blower switch: off

    		 11 to 14 V
    O9-29 (ECOS) - O9-1 (GND) GR - BR 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
    O10-1 (SG-1) - Body ground W - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    O10-3 (CANH) - O10-4 (CANL) P - B CAN communication system CAN communication is performed Pulse generation
    O10-9 (PRE) - O10-32 (SG-2) W - G 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
    O10-10 (TAM) - O10-32 (SG-2) V - G Thermistor assembly 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
    O10-13 (S5-3) - O10-32 (SG-2) B - G Power supply for air conditioner pressure sensor Engine switch on (IG) 4.75 to 5.25 V
    Engine switch off Below 1 V
    O10-16 (TR) - O10-1 (SG-1) B - W 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
    O10-24 (DGS) - O10-32 (SG-2)*2 SB - G 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
    O10-25 (DGS1) - O10-32 (SG-2)*2 LG - G 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
    O10-30 (LOCK) - O10-32 (SG-2) Y - G A/C lock sensor signal

    • Engine running

    • Blower switch: LO

    • A/C switch: on

    		 Pulse generation (See waveform 3)
    O10-32 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor, thermistor assembly, A/C lock sensor, smog ventilation sensor*2 Always Below 1 V
    z1-1 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z1-2 (BUS) - z1-1 (BUS G) - BUS IC control signal Engine switch on (IG) Pulse generation
    z1-3 (B BUS) - z1-1 (BUS G) - Power supply for BUS IC Always 11 to 14 V
    z1-11 (TEA) - z1-12 (SGA) - No. 1 cooler thermistor signal

    • Engine switch on (IG)

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

    		 2.0 to 2.4 V

    • Engine switch on (IG)

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

    		 1.4 to 1.8 V
    z1-12 (SGA) - Body ground - Ground for No. 1 cooler thermistor Always Below 1 V

    • *1: w/ PTC Heater

    • *2: w/ Mirror Heater


    1. A01R5UON01

      Waveform 1:

      Item Content
      Terminal No. O9-3 (BLW) - O9-1 (GND)
      Tool Setting 1 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Blower switch: LO
    2. A01R3A0N07

      Waveform 2:

      Item Content
      Terminal No. O9-4 (SOL+) - O9-1 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: on
    3. A01R63NN06

      Waveform 3:

      Item Content
      Terminal No. O10-30 (LOCK) - O10-32 (SG-2)
      Tool Setting 200 mV/DIV., 10 ms./DIV.
      Vehicle Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: on

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A01R59FN21

    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
    O64-6 (LIN1) - Body ground P - Body ground LIN communication signal Engine switch on (IG) Pulse generation
    O64-8 (IG+) - O64-14 (GND) P - W-B Power source (IG) Engine switch off Below 1 V
    Engine switch on (IG) 11 to 14 V
    O64-14 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    O64-15 (ILL-) - Body ground BE - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position Pulse generation
    O64-16 (ILL+) - Body ground G - Body ground Illumination signal Light control switch off Below 1 V
    Light control switch in tail or head position 11 to 14 V