AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. AIR CONDITIONING AMPLIFIER ASSEMBLY

    A0043CYE83

    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
    L14-1 (IG+) - L14-14 (GND) B - W-B Power source (IG) Power switch on (IG) 11 to 14 V
    L14-1 (IG+) - L14-14 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    L14-5 (TAM) - L14-13 (SG-2) BE - G Ambient temperature sensor signal

    Power switch on (IG)

    Ambient temperature: 25°C (77°F)

    		 1.35 to 1.75 V
    L14-5 (TAM) - L14-13 (SG-2) BE - G Ambient temperature sensor signal

    Power switch on (IG)

    Ambient temperature: 40°C (104°F)

    		 0.9 to 1.2 V
    L14-9 (ECOS) - L14-14 (GND) G - W-B Eco mode switch signal

    Power switch on (IG)

    ECO mode switch (integration control and panel sub-assembly) not pushed

    		 11 to 14 V
    L14-9 (ECOS) - L14-14 (GND) G - W-B Eco mode switch signal

    Power switch on (IG)

    ECO mode switch (integration control and panel sub-assembly) being pushed and held

    		 Below 1 V
    L14-10 (S5-3) - L14-13 (SG-2) B - G Power supply for air conditioning pressure sensor Power switch on (IG) 4.75 to 5.25 V
    L14-10 (S5-3) - L14-13 (SG-2) B - G Power supply for air conditioning pressure sensor Power switch off Below 1 V
    L14-11 (CANH) - L14-12 (CANL) Y - BR CAN communication system CAN communication occurring Pulse generation
    L14-13 (SG-2) - Body ground G - Body ground Ground for air conditioning pressure sensor, ambient temperature sensor Always Below 1 V
    L14-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    L14-16 (PTC3) - L14-14 (GND)*1 BR - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch off

    • Blower switch on

    		 Below 1 V
    L14-16 (PTC3) - L14-14 (GND)*1 BR - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch on

    • Blower switch off

    		 11 to 14 V
    L14-18 (PTC1) - L14-14 (GND)*1 W - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch off

    • Blower switch on

    		 Below 1 V
    L14-18 (PTC1) - L14-14 (GND)*1 W - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch on

    • Blower switch off

    		 11 to 14 V
    L14-21 (B) - L14-14 (GND) Y - W-B Power source (Back-up) Power switch off 11 to 14 V
    L14-23 (BLW) - L14-14 (GND) W - W-B Blower motor speed control signal

    Power switch on (IG)

    Blower switch LO

    Pulse generation

    (See waveform 1)
    L14-27 (IDH) - L14-14 (GND)*1 L - W-B Inverter with converter assembly current over signal

    Power switch on (IG)

    Quick heater assembly operation not permitted

    		 4.5 to 5.5 V
    L14-27 (IDH) - L14-14 (GND)*1 L - W-B Inverter with converter assembly current over signal

    Power switch on (IG)

    Quick heater assembly operation permitted

    		 Less than 1 V
    L14-29 (TR) - L14-34 (SG-1) B - W Room temperature sensor signal

    Power switch on (IG)

    Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V
    L14-29 (TR) - L14-34 (SG-1) B - W Room temperature sensor signal

    Power switch on (IG)

    Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    L14-32 (PRE) - L14-13 (SG-2) L - G Air conditioning pressure sensor signal

    • Power switch on (READY)

    • A/C system operating

    • Refrigerant pressure: Abnormal pressure (more than 3140 kPa (32.0 kgf/cm2, 455 psi))

    		 4.88 V or higher
    L14-32 (PRE) - L14-13 (SG-2) L - G Air conditioning pressure sensor signal

    • Power switch on (READY)

    • A/C system operating

    • Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm2, 28 psi))

    		 Below 0.66 V
    L14-32 (PRE) - L14-13 (SG-2) L - G Air conditioning pressure sensor signal

    • Power switch on (READY)

    • A/C system operating

    • Refrigerant pressure: Normal pressure (less than 3140 kPa (32.0 kgf/cm2, 455 psi) and more than 196 kPa (2.0 kgf/cm2, 28 psi))

    		 0.66 to 4.88 V
    L14-33 (TS) - L14-14 (GND) BR - W-B Solar sensor signal

    Power switch on (IG)

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    L14-33 (TS) - L14-14 (GND) BR - W-B Solar sensor signal

    Power switch on (IG)

    Solar sensor covered with a cloth

    		 Below 0.8 V
    L14-34 (SG-1) - Body ground W - Body ground Ground for room temperature sensor Always Below 1 V
    L14-37 (LIN1) - L14-14 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation
    L14-38 (PTC2) - L14-14 (GND)*1 B - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch off

    • Blower switch on

    		 Below 1 V
    L14-38 (PTC2) - L14-14 (GND)*1 B - W-B PTC heater operation signal

    • Power switch on (READY)

    • Temperature setting: MAX HOT

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

    • Engine coolant temperature: 55°C (131°F) or lower

    • Eco mode switch on

    • Blower switch off

    		 11 to 14 V
    z11-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z11-4 (B BUS) - z11-2 (BUS G) - Power supply for BUS IC Power switch off 11 to 14 V
    z11-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
    z11-6 (TEA) - z11-5 (SGA) - Evaporator temperature sensor signal

    Power switch on (IG)

    Evaporator temperature: 0°C (32°F)

    		 1.7 to 2.1 V
    z11-6 (TEA) - z11-5 (SGA) - Evaporator temperature sensor signal

    Power switch on (IG)

    Evaporator temperature: 15°C (59°F)

    		 0.9 to 1.3 V

    • *1: w/ Quick Heater Assembly


    1. A0043QXE01

      Waveform 1:

      Item Content
      Terminal No. L14-23 (BLW) - L14-14 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Vehicle Condition

      Power switch on (IG)

      Blower switch LO

      Tech Tips

      The waveform varies with the blower speed.

  2. POWER MANAGEMENT CONTROL ECU Click here

  3. AIR CONDITIONING CONTROL ASSEMBLY

    A0042JLE06

    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
    L17-2 (TX+) - L17-8 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation
    L17-3 (SWO) - L17-8 (GND) L - W-B Steering pad switch assembly signal

    No switch pushed

    → R/F switch pushed

    → TEMP+ switch pushed

    → TEMP- switch pushed

    4.44 to 5.43 V

    → 1.19 to 1.49 V

    → 2.09 to 2.54 V

    → 3.2 to 3.88 V
    L17-5 (IG+) - L17-8 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    L17-5 (IG+) - L17-8 (GND) B - W-B Power source (IG) Power switch on (IG) 11 to 14 V
    L17-6 (ILL+) - Body ground G - Body ground Illumination signal Light control switch off Below 1 V
    L17-6 (ILL+) - Body ground G - Body ground Illumination signal Light control switch tail or head 11 to 14 V
    L17-7 (ILL-) - Body ground*1 W-B - Body ground Illumination signal Light control switch off Below 1 V
    L17-8 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V

    • *1: for LHD