AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. A/C AMPLIFIER

    A01JBCGE31

    Tech Tips

    Check from the rear of the connector while it is connected to the A/C amplifier.

    Terminal No.

    (Symbol)

    		 Wiring Color Terminal Description Condition Specified Condition
    L17-1 (IG+) - L17-14 (GND) B - W-B Power source (IG) Power switch on (IG) 11 to 14 V
    L17-1 (IG+) - L17-14 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    L17-5 (TAM) - L17-13 (SG-2) BE - G Ambient temperature sensor signal

    Power switch on (IG)

    Ambient temperature: 25°C (77°F)

    		 1.35 to 1.75 V
    L17-5 (TAM) - L17-13 (SG-2) BE - G Ambient temperature sensor signal

    Power switch on (IG)

    Ambient temperature: 40°C (104°F)

    		 0.9 to 1.2 V
    L17-9 (PRE) - L17-13 (SG-2) L - G A/C pressure sensor signal

    Engine started, A/C system operating, Refrigerant pressure: Abnormal pressure (more than 3140 kPa (32.0 kgf/cm2, 455 psi))

    		 4.84 V or higher
    L17-9 (PRE) - L17-13 (SG-2) L - G A/C pressure sensor signal

    Engine started, A/C system operating, Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm2, 28 psi))

    		 Below 0.73 V
    L17-9 (PRE) - L17-13 (SG-2) L - G A/C pressure sensor signal

    Engine started, 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))

    		 0.73 to 4.84 V
    L17-10 (S5-3) - L17-13 (SG-2) B - G Power supply for A/C pressure sensor

    Power switch on (IG)

    A/C switch on

    		 4.75 to 5.25 V
    L17-10 (S5-3) - L17-13 (SG-2) B - G Power supply for A/C pressure sensor

    Power switch on (IG)

    A/C switch off

    		 Below 1 V
    L17-11 (CANH) Y CAN communication system - -
    L17-12 (CANL) BR CAN communication system - -
    L17-13 (SG-2) - Body ground G - Body ground Ground for A/C pressure sensor, A/C ambient temperature sensor Always Below 1 V
    L17-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    L17-15 (ECOS) - L17-14 (GND) G - W-B ECO MODE switch signal

    Power switch on (IG)

    ECO MODE switch off

    		 11 to 14 V
    L17-15 (ECOS) - L17-14 (GND) G - W-B ECO MODE switch signal

    Power switch on (IG)

    ECO MODE switch on

    		 Below 1 V
    L17-16 (PTC3) - L17-14 (GND)*1 BR - W-B PTC heater operation signal

    Engine is running (1250 rpm or higher)

    Temperature setting: MAX. HOT

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

    Engine coolant temperature: 65°C (149°F) or lower

    Light control switch off

    Blower switch on

    		 11 to 14 V
    L17-18 (PTC1) - L17-14 (GND)*1 W - W-B PTC heater operation signal

    Engine is running (1250 rpm or higher)

    Temperature setting: MAX. HOT

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

    Engine coolant temperature: 75°C (167°F) or lower

    Light control switch off

    Blower switch on

    		 11 to 14 V
    L17-21 (B) - L17-14 (GND) Y - W-B Power source (Back-up) Power switch off 11 to 14 V
    L17-23 (BLW) - L17-14 (GND) W - W-B Blower motor speed control signal

    Power switch on (IG)

    Blower switch LO

    Pulse generation

    (See waveform 1)
    L17-25 (PVSW) - L17-14 (GND)*2 P - W-B Solar ventilation switch signal Solar ventilation switch off 4.5 to 5.5 V
    L17-25 (PVSW) - L17-14 (GND)*2 P - W-B Solar ventilation switch signal Solar ventilation switch on Below 1 V
    L17-26 (SSLR) - L17-14 (GND)*2 L - W-B Solar ventilation ECU status signal

    Power switch on (IG)

    SBI terminal: 7 V or higher

    Solar ventilation system: off

    Pulse generation

    (See waveform 2)
    L17-27 (IDH) - L17-14 (GND)*1 L - W-B Inverter with converter assembly current over signal Power switch on (IG) Pulse generation
    L17-29 (TR) - L17-34 (SG-1) B - W Room temperature sensor signal

    Power switch on (IG)

    Cabin temperature: 25°C (77°F)

    		 1.8 to 2.2 V
    L17-29 (TR) - L17-34 (SG-1) B - W Room temperature sensor signal

    Power switch on (IG)

    Cabin temperature: 40°C (104°F)

    		 1.2 to 1.6 V
    L17-33 (TS) - L17-14 (GND) BR - W-B Solar sensor signal

    Power switch on (IG)

    Solar sensor subjected to electric light

    		 0.8 to 4.3 V
    L17-33 (TS) - L17-14 (GND) BR - W-B Solar sensor signal

    Power switch on (IG)

    Solar sensor covered with a cloth

    		 Below 0.8 V
    L17-34 (SG-1) - Body ground W - Body ground Ground for room temperature sensor Always Below 1 V
    L17-37 (LIN1) - L17-14 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation
    L17-38 (PTC2) - L17-14 (GND)*1 R - W-B PTC heater operation signal

    Engine is running (1250 rpm or higher)

    Temperature setting: MAX. HOT

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

    Engine coolant temperature: 65°C (149°F) to 70°C (158°F)

    Light control switch off

    Blower switch on

    		 11 to 14 V
    z6-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    z6-3 (BUS) - z6-2 (BUS G) - BUS IC control signal Power switch on (IG) Pulse generation
    z6-4 (B BUS) - z6-2 (BUS G) - Power supply for BUS IC Power switch off Below 1 V
    z6-4 (B BUS) - z6-2 (BUS G) - Power supply for BUS IC Power switch on (IG) 11 to 14 V
    z6-5 (SG) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
    z6-6 (TE) - z6-5 (SG) - A/C evaporator temperature sensor signal

    Power switch on (IG)

    Evaporator temperature: 0°C (32°F)

    		 1.7 to 2.1 V
    z6-6 (TE) - z6-5 (SG) - A/C evaporator temperature sensor signal

    Power switch on (IG)

    Evaporator temperature: 15°C (59°F)

    		 0.9 to 1.3 V

    • *1: w/ PTC Heater Assembly

    • *2: w/ Solar Ventilation System


    1. A01JAQBE01

      Waveform 1:

      Item Content
      Terminal No. L17-23 (BLW) - L17-14 (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. A01JA8GE03

      Waveform 2:

      Item Content
      Terminal No. L17-26 (SSLR) - L17-14 (GND)
      Tool Setting 1 V/DIV., 100 ms/DIV.
      Vehicle Condition

      Power switch on (IG)

      SBI terminal: 7 V or higher

      Solar ventilation system: off

      Tech Tips

      The waveform varies with the communication content.

  2. A/C CONTROL ASSEMBLY

    A01J8OIE06

    Tech Tips

    Check from the rear of the connector while it is connected to the A/C control assembly.

    Terminal No.

    (Symbol)

    		 Wiring Color Terminal Description Condition Specified Condition
    L20-2 (TX+) - L20-8 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation
    L20-3 (SW0) - L20-8 (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
    L20-5 (IG+) - L20-8 (GND) B - W-B Power source (IG) Power switch off Below 1 V
    L20-5 (IG+) - L20-8 (GND) B - W-B Power source (IG) Power switch on (IG) 11 to 14 V
    L20-6 (ILL+) - L20-7 (ILL-) G - W-B Light control switch signal Light control switch off Below 1 V
    L20-6 (ILL+) - L20-7 (ILL-) G - W-B Light control switch signal Light control switch tail or head 11 to 14 V
    L20-8 (GND) - Body ground W-B - Body ground Ground for front A/C control assembly Always Below 1 V