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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 63 (Heating / Air Conditioning System (HEV) - Diagnostics - Introduction) >> AIR CONDITIONING SYSTEM (for HV Model) >> Terminals Of Ecu [04/2020 - 06/2021] >> Terminals Of Ecu [04/2020 - 06/2021]

Terminals Of Ecu [04/2020 - 06/2021]

WARNING: This page is about a different variant/trim than selected.
  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    GTY855614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    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
    I48-1 (TAM) - Body ground R - Body ground Thermistor assembly signal
    • Power switch on (IG)
    • Ambient temperature: 25°C (77°F)
    		 1.05 to 1.45 V
    • Power switch on (IG)
    • Ambient temperature: 40°C (104°F)
    		 0.64 to 0.87 V
    I48-3 (SG-1) - Body ground W - Body ground Ground for cooler (room temp. sensor) thermistor Always Below 1 V
    I48-5 (TR) - I49-17 (GND) B - W-B Cooler (room temp. sensor) thermistor signal
    • Power switch on (IG)
    • Cabin temperature: 25°C (77°F)
    		 1.05 to 1.45 V
    • Power switch on (IG)
    • Cabin temperature: 40°C (104°F)
    		 0.64 to 0.87 V
    I48-6 (PRE) - I49-17 (GND) L - W-B Air conditioner pressure sensor signal
    • Power switch on (READY)
    • Air conditioning system operating
    • Refrigerant pressure: Abnormal pressure (more than 3025 kPaG (30.8 kgf/cm2 , 439 psi)*1, more than 2812 kPaG (28.7 kgf/cm2 , 408 psi)*2)
    		 4.73 V or higher
    • Power switch on (READY)
    • Air conditioning system operating
    • Refrigerant pressure: Abnormal pressure (less than 176 kPaG (1.8 kgf/cm2 , 26 psi)*1, less than 196 kPaG (2.0 kgf/cm2 , 28 psi) or less*2)
    		 Below 0.62 V
    • Power switch on (READY)
    • Air conditioning system operating
    • Refrigerant pressure: Normal pressure (less than 3025 kPaG (30.8 kgf/cm2 , 439 psi) and more than 176 kPaG (1.8 kgf/cm2 , 26 psi)*1, less than 2812 kPaG (28.7 kgf/cm2 , 408 psi) and more than 196 kPaG (2.0 kgf/cm2 , 28 psi)*2)
    		 0.62 to 4.73 V*4
    I48-11 (S5-3) - I49-17 (GND) B - W-B Power supply for air conditioner pressure sensor Power switch on (IG) 4.75 to 5.25 V
    Power switch off Below 1 V
    I48-14 (SG-2) - Body ground BR - Body ground Ground for thermistor assembly Always Below 1 V
    I48-15 (SG-4) - Body ground G - Body ground Ground for air conditioner pressure sensor Always Below 1 V
    I48-16 (PTC2) - I49-17 (GND)*3 B - W-B Quick heater assembly operation signal
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 65°C (149°F) or lower
    • Blower switch: On
    		 Below 1 V
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 65°C (149°F) or lower
    • Blower switch: Off
    		 11 to 14 V
    I48-17 (PTC3) - I49-17 (GND)*3 BR - W-B Quick heater assembly operation signal
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 60°C (140°F) or lower
    • Blower switch: On
    		 Below 1 V
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 60°C (140°F) or lower
    • Blower switch: Off
    		 11 to 14 V
    I49-1 (CANL) - I49-2 (CANH) W - G CAN communication system CAN communication is performed Pulse generation
    I49-5 (B) - I49-17 (GND) LG - W-B Power source (Back-up) Power switch off 11 to 14 V
    I49-6 (IG+) - I49-17 (GND) SB - W-B Power source (IG) Power switch on (IG) 11 to 14 V
    Power switch off Below 1 V
    I49-7 (LIN1) - I49-17 (GND) V - W-B LIN communication signal Power switch on (IG) Pulse generation
    (See waveform 2)
    I49-17 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
    I49-21 (BLW) - I49-17 (GND) W - W-B Blower motor speed control signal
    • Power switch on (IG)
    • Blower switch: LO
    		 Pulse generation
    (See waveform 1)
    I49-23 (PTC1) - I49-17 (GND)*3 W - W-B Quick heater assembly operation signal
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 70°C (158°F) or lower
    • Blower switch: On
    		 Below 1 V
    • Power switch on (READY)
    • ECO switch assembly (air conditioning control assembly): Off
    • Temperature setting: MAX HOT
    • Ambient temperature: 10°C (50°F) or lower
    • Engine coolant temperature: 70°C (158°F) or lower
    • Blower switch: Off
    		 11 to 14 V
    z1-2 (BUSG) - Body ground - Ground for BUS IC Always Below 1 V
    z1-3 (BUS) - z1-2 (BUSG) - BUS IC control signal Power switch on (IG) Pulse generation
    (See waveform 3)
    z1-4 (BUSB) - z1-2 (BUSG) - Power supply for BUS IC Power switch off 11 to 14 V
    z1-5 (SG-3) - Body ground GR - Body ground Ground for No. 1 cooler thermistor Always Below 1 V
    z1-6 (TE) - z1-5 (SG-3) 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. *1: for HFC-134a (R134a)
    2. *2: for HFO-1234yf (R1234yf)
    3. *3: w/ PTC Heater
    4. *4: While sensor voltage is 5 V.
    1. Waveform 1:
      GTY578346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. I49-21 (BLW) - I49-17 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Condition
      • Power switch on (IG)
      • Blower switch: LO
    2. Waveform 2:
      GTY600247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. I49-7 (LIN1) - I49-17 (GND)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Power switch on (IG)
    3. Waveform 3:
      GTY563288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. z1-3 (BUS) - z1-2 (BUSG)
      Tool Setting 2 V/DIV., 2 ms./DIV.
      Condition Power switch on (IG)
  2. CHECK AIR CONDITIONING CONTROL ASSEMBLY 
    GTY860410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    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
    I37-7 (LIN1) - Body ground V - Body ground LIN communication signal Power switch on (IG) Pulse generation
    (See waveform)
    I37-8 (ILL+) - Body ground P - Body ground Illumination signal Taillight off Below 1 V
    Taillight on 11 to 14 V
    I37-9 (IG+) - I37-13 (GND) LG - W-B Power source (IG) Power switch off Below 1 V
    Power switch on (IG) 11 to 14 V
    I37-13 (GND) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 V
    I37-14 (ILL-) - Body ground W - Body ground Illumination signal Always Below 1 V
    1. Waveform:
      GTY563288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. I37-7 (LIN1) - Body ground
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Power switch on (IG)
  3. CHECK HYBRID VEHICLE CONTROL ECU 

    for NICKEL METAL HYDRIDE BATTERY: Refer to TERMINALS OF ECU [01/2019 - 09/2022]

    for LITHIUM-ION BATTERY: Refer to TERMINALS OF ECU [04/2020 - 09/2022]

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