AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01MTAON13

    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
    K10-1 (GND) - Body ground BR - Body ground Ground for main power supply Always Below 1 V
    K10-3 (BLW) - K10-1 (GND) BE - BR Blower motor speed control signal

    • Power switch on (IG)

    • Blower switch: Lo

    Pulse generation

    (See waveform 1)
    K10-5 (IG+) - K10-1 (GND) R - BR Power source (IG) Power switch on (IG) 11 to 14 V
    Power switch off Below 1 V
    K10-6 (+B1) - K10-1 (GND) L - BR Power source (Back-up) Power switch off 11 to 14 V
    K10-8 (PTC1) - K10-1 (GND)*1 R - BR Quick heater assembly operation signal

    • Power switch on (READY)

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 64°C (147°F) or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

    • Blower switch: on

    		 Below 1 V

    • Power switch on (READY)

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 64°C (147°F) or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

    • Blower switch: off

    		 11 to 14 V
    K10-21 (RLIN) - K10-1 (GND) P - BR LIN communication signal Power switch on (IG) Pulse generation
    K10-23 (IDH) - K10-1 (GND) B - BR Inverter with converter assembly current over signal

    • Power switch on (IG)

    • Quick heater assembly operation permitted

    		 Below 1 V

    • Power switch on (IG)

    • Quick heater assembly operation not permitted

    		 4.75 to 5.25 V
    K10-26 (PTC2) - K10-1 (GND)*1 L - BR Quick heater assembly operation signal

    • Power switch on (READY)

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 60°C (140°F) or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

    • Blower switch: on

    		 Below 1 V

    • Power switch on (READY)

    • Combination switch assembly (ECO mode switch) off

    • Temperature settings: MAX HOT

    • Ambient temperature: 10°C (50°F) or lower

    • Engine coolant temperature: 60°C (140°F) or lower

    • IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected)

    • Blower switch: off

    		 11 to 14 V
    K10-29 (ECOS) - K10-1 (GND) GR - BR Combination switch assembly (ECO mode switch) signal

    • Power switch on (IG)

    • Combination switch assembly (ECO mode switch) off

    		 11 to 14 V

    • Power switch on (IG)

    • Combination switch assembly (ECO mode switch) on

    		 Below 1 V
    K11-1 (SG-1) - Body ground W - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    K11-3 (CANH) - K11-4 (CANL) P - B CAN communication system CAN communication is performed Pulse generation
    K11-9 (PRE) - K11-32 (SG-2) W - G Air conditioner pressure sensor signal

    • Power switch on (READY)

    • Air conditioning system operating

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

    		 4.71 V or higher

    • Power switch on (READY)

    • Air conditioning system operating

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

    		 Below 0.74 V

    • Power switch on (READY)

    • 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 4.71 V
    K11-10 (TAM) - K11-32 (SG-2) V - G Thermistor assembly signal

    • Power switch on (IG)

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

    		 1.35 to 1.75 V

    • Power switch on (IG)

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

    		 0.9 to 1.2 V
    K11-13 (S5-3) - K11-32 (SG-2) B - G Power supply for air conditioner pressure sensor Power switch on (IG) 4.75 to 5.25 V
    Power switch off Below 1 V
    K11-16 (TR) - K11-1 (SG-1) B - W Cooler (room temp. sensor) thermistor signal

    • Power switch on (IG)

    • Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V

    • Power switch on (IG)

    • Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    K11-32 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor, thermistor assembly 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 Power switch on (IG) Pulse generation
    z1-3 (B BUS) - z1-1 (BUS G) - Power supply for BUS IC Power switch off 11 to 14 V
    z1-11 (TEA) - z1-12 (SGA) - No. 1 cooler thermistor signal

    • Power switch on (IG)

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

    		 2.0 to 2.4 V

    • Power 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


    1. A011PFIN01

      Waveform 1:

      Item Content
      Terminal No. K10-3 (BLW) - K10-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      • Power switch on (IG)

      • Blower switch: LO

  2. AIR CONDITIONING CONTROL ASSEMBLY

    A011NJCN09

    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
    K65-6 (LIN1) - Body ground P - Body ground LIN communication signal Power switch on (IG) Pulse generation
    K65-8 (IG+) - K65-14 (GND) P - W-B Power source (IG) Power switch off Below 1 V
    Power switch on (IG) 11 to 14 V
    K65-14 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    K65-15 (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
    K65-16 (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