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


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    B00702GN10

    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
    K55-2 (SG-2) - Body ground W - Body ground Ground for thermistor assembly Always Below 1 V
    K55-3 (SG-4) - Body ground L - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    K55-6 (S5-3) - K55-3 (SG-4) GR - L Power supply for air conditioner pressure sensor Ignition switch ON 4.75 to 5.25 V
    Ignition switch off Below 1 V
    K55-13 (TAM) - K55-2 (SG-2) R - W Thermistor assembly signal

    • Ignition switch ON

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

    		 1.05 to 1.45 V

    • Ignition switch ON

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

    		 0.64 to 0.87 V
    K55-24 (PRE) - K55-3 (SG-4) W - L 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
    K54-1 (B) - K54-4 (GND) LA-B - W-B Power source (Back-up) Always 11 to 14 V
    K54-2 (IG+) - K54-4 (GND) LA-GR - W-B Power source (IG) Ignition switch ON 11 to 14 V
    Ignition switch off Below 1 V
    K54-3 (SOL+) - K54-4 (GND) R - W-B Compressor solenoid operation signal

    • Engine running

    • Blower switch: LO

    • A/C switch: On

    Pulse generation

    (See waveform 1)
    K54-4 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    K54-6 (BLW) - K54-4 (GND) LG - W-B Blower motor speed control signal

    • Ignition switch ON

    • Blower switch: LO

    Pulse generation

    (See waveform 2)
    K54-11 (CANH) - K54-12 (CANL) SB - W CAN communication system CAN communication is performed Pulse generation
    K54-14 (LIN1) - K54-4 (GND) BE - W-B LIN communication signal Ignition switch ON

    Pulse generation

    (See waveform 3)
    z8-2 (1A) - Body ground - Ground for BUS IC Always Below 1 V
    z8-3 (2A) - z8-2 (1A) - BUS IC control signal Ignition switch ON

    Pulse generation

    (See waveform 4)
    z8-4 (3A) - z8-2 (1A) - Power supply for BUS IC Ignition switch off 11 to 14 V
    z8-5 (4A) - Body ground GR - Body ground Ground for No. 1 cooler thermistor Always Below 1 V
    z8-6 (5A) - z8-5 (4A) GR - GR No. 1 cooler thermistor signal

    • Ignition switch ON

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

    		 1.7 to 2.1 V

    • Ignition switch ON

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

    		 0.9 to 1.3 V

    1. B0070A7N07

      Waveform 1:

      Item Content
      Terminal No. K54-3 (SOL+) - K54-4 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
    2. B006Z35N01

      Waveform 2:

      Item Content
      Terminal No. K54-6 (BLW) - K54-4 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Condition

      • Ignition switch ON

      • Blower switch: LO
    3. B0071I8N02

      Waveform 3:

      Item Content
      Terminal No. K54-14 (LIN1) - K54-4 (GND)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON
    4. B006XNXN05

      Waveform 4:

      Item Content
      Terminal No. z8-3 (2A) - z8-2 (1A)
      Tool Setting 2 V/DIV., 2 ms./DIV.
      Condition Ignition switch ON

  2. CHECK AIR CONDITIONING CONTROL ASSEMBLY

    B006ZT6E02

    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
    K26-2 (IG+) - K26-6 (GND) GR - W-B Power source (IG) Ignition switch off Below 1 V
    Ignition switch ON 11 to 14 V
    K26-6 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    K26-9 (LIN1) - Body ground LG - Body ground LIN communication signal Ignition switch ON

    Pulse generation

    (See waveform)
    K26-11 (ILL+) - Body ground W - Body ground Illumination signal Light control switch in off position Below 1 V
    Light control switch in tail or head position 11 to 14 V
    K26-15 (ILL-) - Body ground B - Body ground Illumination signal Always Below 1 V

    1. B006XNXN05

      Waveform:

      Item Content
      Terminal No. K26-9 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON