AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01VEZSE02

    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
    F42-1 (IG+) - F42-14 (GND) V - W-B Ignition power supply Ignition switch: ON 11 to 14 V
    F42-2 (SOL+) - F42-14 (GND) P - W-B A/C compressor operation signal Engine idling

    Pulse generation

    (See waveform 1)
    Blower switch: LO
    A/C switch: ON
    F42-9 (PRE) - F42-14 (GND) GR - W-B Air conditioning pressure sensor signal Refrigerant pressure: Normal 0.74 to 4.62 V

    Refrigerant pressure: Abnormal (less than 0.176 MPaG [1.8 kgf/cm2]) or more than 3.03 MPaG [31 kgf/cm2])

    		 Below 0.74 V or 4.62 V or more
    F42-10 (S5-3) - F42-14 (GND) Y - W-B Power supply for pressure sensor Ignition switch: ON 4.75 to 5.25 V
    F42-11 (TX+) - F42-14 (GND) V - W-B CAN communication signal Ignition switch: ON

    Pulse generation

    (See waveform 2)
    F42-12 (TX-) - F42-14 (GND) W - W-B CAN communication signal Ignition switch: ON

    Pulse generation

    (See waveform 3)
    F42-13 (SG-2) - Body ground L - Body ground Ground for A/C pressure sensor Always Below 1 Ω
    F42-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
    F42-21 (B) - F42-14 (GND) BE - W-B Battery power supply Always 11 to 14 V
    F42-40 (PTC1) - Body ground*1 V - Body ground Quick heater assembly relay operation signal Engine idling 11 to 14 V → Below 1 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 75°C (167°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO
    Waiting time: 10 seconds
    F42-39 (PTC2) - Body ground*1 P - Body ground Quick heater assembly relay operation signal Engine idling 11 to 14 V → Below 1 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 70°C (158°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO
    Waiting time: 20 seconds
    F42-3 (PTC3) - Body ground*1 Y - Body ground Quick heater assembly relay operation signal Engine idling 11 to 14 V → Below 1 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO
    Waiting time: 30 seconds
    F42-22 (BLW) - F42-14 (GND) R - W-B Blower motor control signal Ignition switch: ON

    Pulse generation

    (See waveform 4)
    Blower switch: LO
    F42-29 (TR) - F42-34 (SG-1) P - SB Room temperature sensor signal Ignition switch: ON 1.8 to 2.2 V
    Vehicle interior temperature: 25°C
    F42-30 (S5-1) - F42-14 (GND)*2 L - W-B Solar sensor power supply Ignition switch: ON 4.5 to 5.5 V
    F42-33 (TSD) - F42-14 (GND) R - W-B Solar sensor signal Ignition switch: ON 0.8 to 4.3 V
    Solar sensor subject to electric light
    F42-34 (SG-1) - Body ground SB - Body ground Ground for room temperature sensor Always Below 1 Ω
    F42-37 (LIN1) - F42-14 (GND) LG - W-B LIN communication signal Ignition switch: ON Pulse generation
    z4-2 (BUSG) - Body ground - Ground for BUS IC Always Below 1 Ω
    z4-3 (BUS) - z4-2 (BUSG) - BUS IC control signal Ignition switch: ON Pulse generation
    z4-4 (BBUS) - z4-2 (BUSG) - BUS IC power supply Always 11 to 14 V
    z4-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω
    z4-6 (TEA) - z4-5 (SGA) - Evaporator temperature sensor signal Ignition switch: ON 1.4 to 1.8 V
    Evaporator temperature: 15°C (59°F)

    • *1: w/ PTC Heater

    • *2: w/o Automatic Light Control System

    • If the result is not as specified, there may be a malfunction in the wire harness.


    1. A01VKGIE26
      *a 5 V/DIV.
      *b 500 μsec/DIV.

      Waveform 1: Using an oscilloscope

      Compressor and Pulley Operation Signal
      Terminal Name F42-2 (SOL+) - F42-14 (GND)
      Tester Range 5 V/DIV., 500 μs/DIV.
      Condition

      Engine idling

      Blower switch LO

      A/C switch ON
    2. A01VDVSE01
      *a 1 V/DIV.
      *b 10 μsec./DIV.

      Waveform 2 (Reference) : Using an oscilloscope

      CAN Communication Signal
      Terminal Name F42-11 (TX+) - F42-14 (GND)
      Tester Range 1 V/DIV., 10 μs/DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    3. A01VKJKE92
      *a 1 V/DIV.
      *b 10 μsec./DIV.

      Waveform 3 (Reference) : Using an oscilloscope

      CAN Communication Signal
      Terminal Name F42-12 (TX-) - F42-14 (GND)
      Tester Range 1 V/DIV., 10 μs/DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    4. A01VGW8E48
      *a 1 V/DIV.
      *b 500 μsec/DIV.

      Waveform 4: Using an oscilloscope.

      Blower Motor Control Signal
      Terminal Name F42-22 (BLW) - F42-14 (GND)
      Tester Range 1 V/DIV., 500 μs/DIV.
      Condition

      Ignition switch ON

      Blower switch LO

      Tech Tips

      When the blower level is increased, the duty ratio changes accordingly.

  2. CHECK COMBINATION METER ASSEMBLY

    A01VJCDE02

    Tech Tips

    Check from the rear of the connector while it is connected to the combination meter assembly.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    F1-34 (TX1-) - Body ground B - Body ground Ground for ambient temperature sensor Always Below 1 Ω
    F1-35 (TX1+) - F1-34 (TX1-) W - B Ambient temperature sensor signal Ignition switch ON at 25°C (77°F) 1.35 to 1.75 V
    F1-39 (IG+) - Body ground P - Body ground Ignition power supply Ignition switch ON 11 to 14 V
    F1-40 (B) - Body ground L - Body ground Battery power supply Always 11 to 14 V

    • If the result is not as specified, there may be a malfunction in the wire harness.

  3. CHECK AIR CONDITIONING CONTROL ASSEMBLY

    A01VJI7E02
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    F40-5 (IG+) - F40-8 (GND) V - BR Ignition power supply Ignition switch: ON 11 to 14 V
    F40-3 (LIN1) - F40-8 (GND) LG - BR LIN communication signal Ignition switch: ON Pulse generation
    F40-8 (GND) - Body ground BR - Body Ground Ground for air conditioning control assembly Always Below 1 Ω

    • If the result is not as specified, there may be a malfunction in the wire harness.