AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01KTBON09

    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
    E28-1 (IG+) - E28-14 (GND) L - BR Power source (IG) Power switch on (IG) 11 to 14 V
    Power switch off Below 1 V
    E28-3 (PTC2) - E28-14 (GND)*2 R - BR Quick heater assembly operation signal

    • Power switch on (READY)

    • Combination switch assembly (eco switch) on

    • Blower motor off

    • Temperature settings: except MAX HOT

    • Engine coolant temperature 65°C or lower

    • Ambient temperature 10°C or lower

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

    		 11 to 14 V

    • Power switch on (READY)

    • Combination switch assembly (eco switch) off

    • Blower motor on

    • Temperature settings: MAX HOT

    • Engine coolant temperature 65°C or lower

    • Ambient temperature 10°C or lower

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

    		 Below 1 V
    E28-9 (PRE) - E28-13 (SG-2) L - 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))

    		 4.73 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 0.62 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))

    		 0.62 to 4.73 V
    E28-10 (S5-3) - E28-13 (SG-2) V - G Power supply for air conditioner pressure sensor Power switch on (IG) 4.75 to 5.25 V
    Power switch off Below 1 V
    E28-11 (CANH) - E28-12 (CANL) Y - W CAN communication system CAN communication occurring Pulse generation
    E28-13 (SG-2) - Body ground G - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    E28-14 (GND) - Body ground BR - Body ground Ground for main power supply Always Below 1 V
    E28-21 (B) - E28-14 (GND) W - BR Power source (Back-up) Power switch off 11 to 14 V
    E28-22 (BLW) - E28-14 (GND) R - BR Blower motor speed control signal

    • Power switch on (IG)

    • Blower switch: LO

    Pulse generation

    (See waveform 1)
    E28-24 (ECOS) - E28-14 (GND) G - BR Combination switch assembly (eco switch) signal

    • Power switch on (IG)

    • Combination switch assembly (eco switch) on

    		 Below 1 V

    • Power switch on (IG)

    • Combination switch assembly (eco switch) off

    		 11 to 14 V
    E28-27 (IDH) - E28-14 (GND) P - 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
    E28-29 (TR) - E28-34 (SG-1) GR - V 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
    E28-30 (S5-1) - E28-14 (GND) LG - BR Power supply for cooler (solar sensor) thermistor Power switch on (IG) 4.5 to 5.5 V
    Power switch off Below 1 V
    E28-32 (TSP) - E28-14 (GND)*1 P - BR Cooler (solar sensor) thermistor signal

    • Power switch on (IG)

    • Cooler (solar sensor) thermistor subjected to electric light

    		 0.8 to 4.3 V

    • Power switch on (IG)

    • Cooler (solar sensor) thermistor covered with a cloth

    		 Below 0.8 V
    E28-33 (TSD) - E28-14 (GND) L - BR Cooler (solar sensor) thermistor signal

    • Power switch on (IG)

    • Cooler (solar sensor) thermistor subjected to electric light

    		 0.8 to 4.3 V

    • Power switch on (IG)

    • Cooler (solar sensor) thermistor covered with a cloth

    		 Below 0.8 V
    E28-34 (SG-1) - Body ground V - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    E28-37 (LIN1) - E28-14 (GND) SB - BR LIN communication signal Power switch on (IG) Pulse generation
    E28-39 (PTC3) - E28-14 (GND)*2 P - BR Quick heater assembly operation signal

    • Power switch on (READY)

    • Combination switch assembly (eco switch) on

    • Blower motor off

    • Temperature settings: except MAX HOT

    • Engine coolant temperature 70°C or lower

    • Ambient temperature 10°C or lower

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

    		 11 to 14 V

    • Power switch on (READY)

    • Combination switch assembly (eco switch) off

    • Blower motor on

    • Temperature settings: MAX HOT

    • Engine coolant temperature 70°C or lower

    • Ambient temperature 10°C or lower

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

    		 Below 1 V
    E28-40 (PTC1) - E28-14 (GND)*2 W - BR Quick heater assembly operation signal

    • Power switch on (READY)

    • Combination switch assembly (ECO switch) on

    • Blower motor off

    • Temperature settings: except MAX HOT

    • Engine coolant temperature 75°C or lower

    • Ambient temperature 10°C or lower

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

    		 11 to 14 V

    • Power switch on (READY)

    • Combination switch assembly (ECO switch) off

    • Blower motor on

    • Temperature settings: MAX HOT

    • Engine coolant temperature 75°C or lower

    • Ambient temperature 10°C or lower

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

    		 Below 1 V
    z3-2 (BUS G) - Body ground B - Body ground Ground for BUS IC Always Below 1 V
    z3-3 (BUS) - z3-2 (BUS G) L - B BUS IC control signal Power switch on (IG) Pulse generation
    z3-4 (B BUS) - z3-2 (BUS G) R - B Power supply for BUS IC Power switch off 11 to 14 V
    z3-5 (SGA) - Body ground GR - Body ground Ground for No. 1 cooler thermistor Always Below 1 V
    z3-6 (TEA) - z3-5 (SGA) GR - GR No. 1 cooler thermistor signal

    • Power switch on (IG)

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

    		 1.7 to 2.1 V

    • Power switch on (IG)

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

    		 0.9 to 1.3 V

    • *1: for Dual Type

    • *2: w/ PTC Heater


    1. A01KR4FN19

      Waveform 1:

      Item Content
      Terminal No. E28-22 (BLW) - E28-14 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      • Power switch on (IG)

      • Blower switch: LO

  2. HYBRID VEHICLE CONTROL ECU ASSEMBLY

    Click here

  3. INVERTER WITH CONVERTER ASSEMBLY

    Click here

  4. AIR CONDITIONING CONTROL ASSEMBLY

    A01KS7WN15

    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
    E130-1 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    E130-4 (ILL+) - Body ground LG - Body ground Illumination signal Light control switch off Below 1 V
    E130-4 (ILL+) - Body ground LG - Body ground Illumination signal Light control switch tail or head position 11 to 14 V
    E130-5 (ILL-) - Body ground W-B - Body ground Illumination signal Always Below 1 V
    E130-6 (LIN1) - Body ground SB - Body ground LIN communication signal Power switch on (IG) Pulse generation
    E130-8 (IG+) - E130-1 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    E130-8 (IG+) - E130-1 (GND) B - W-B Power source (IG) Power switch on (IG) 11 to 14 V