Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001A3O4
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): TERMINALS OF ECU; 2019 MY Avalon HV [04/2018 - 08/2019]

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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

G35-1 (B) - G35-4 (GND)

LA-B - W-B

Power source (Back-up)

Power switch off

11 to 14 V

G35-2 (IG+) - G35-4 (GND)

LA-GR - W-B

Power source (IG)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

G35-4 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 V

G35-6 (BLW) - G35-4 (GND)

LG - W-B

Blower motor speed control signal
  • Power switch on (IG)
  • Blower switch: LO

Pulse generation

(See waveform 1)

G35-11 (CANH) - G35-12 (CANL)

SB - W

CAN communication system

CAN communication is performed

Pulse generation

G35-14 (LIN1) - G35-4 (GND)

LG - W-B

LIN communication signal

Power switch on (IG)

Pulse generation

(See waveform 2)

G35-18 (PTC1) - G35-4 (GND)

R - W-B

Quick heater assembly operation signal
  • Power switch on (READY)
  • ECO switch assembly (electric parking brake switch assembly): Off
  • 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

Below 1 V
  • Power switch on (READY)
  • ECO switch assembly (electric parking brake switch assembly): Off
  • 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: Off

11 to 15.5 V

G36-1 (SG-1) - Body ground

LG - Body ground

Ground for cooler (room temp. sensor) thermistor

Always

Below 1 V

G36-2 (SG-2) - Body ground

W - Body ground

Ground for thermistor assembly

Always

Below 1 V

G36-3 (SG-4) - Body ground

L - Body ground

Ground for air conditioner pressure sensor

Always

Below 1 V

G36-6 (S5-3) - G36-3 (SG-4)

GR - L

Power supply for air conditioner pressure sensor

Power switch on (IG)

4.75 to 5.25 V

Power switch off

Below 1 V

G36-10 (PTC2) - G35-4 (GND)

L - W-B

Quick heater assembly operation signal
  • Power switch on (READY)
  • ECO switch assembly (electric parking brake switch assembly): Off
  • Temperature setting: MAX HOT
  • Ambient temperature: 0°C (32°F) or lower
  • Engine coolant temperature: 62.5°C (144.5°F) or lower
  • Light control switch off
  • Blower switch: On

Below 1 V
  • Power switch on (READY)
  • ECO switch assembly (electric parking brake switch assembly): Off
  • Temperature setting: MAX HOT
  • Ambient temperature: 0°C (32°F) or lower
  • Engine coolant temperature: 62.5°C (144.5°F) or lower
  • Light control switch off
  • Blower switch: Off

11 to 15.5 V

G36-13 (TAM) - G36-2 (SG-2)

R - W

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

G36-14 (TR) - G36-1 (SG-1)

GR - LG

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

G36-20 (ECOS) - G35-4 (GND)

W - W-B

ECO switch assembly (electric parking brake switch assembly) signal
  • Power switch on (IG)
  • ECO switch assembly (electric parking brake switch assembly): Off

11 to 14 V
  • Power switch on (IG)
  • ECO switch assembly (electric parking brake switch assembly): On

Below 1 V

G36-24 (PRE) - G36-3 (SG-4)

W - L

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))

4.61 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))

Below 0.74 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))

0.74 to 4.61 V

z9-2 (BUS G) - Body ground

B - Body ground

Ground for BUS IC

Always

Below 1 V

z9-3 (BUS) - z9-2 (BUS G)

L - B

BUS IC control signal

Power switch on (IG)

Pulse generation

(See waveform 3)

z9-4 (B BUS) - z9-2 (BUS G)

R - B

Power supply for BUS IC

Power switch off

11 to 14 V

z9-5 (SGA) - Body ground

GR - Body ground

Ground for No. 1 cooler thermistor

Always

Below 1 V

z9-6 (TEA) - z9-5 (SGA)

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

(a) Waveform 1:

Item

Content

Terminal No.

G35-6 (BLW) - G35-4 (GND)

Tool Setting

2 V/DIV., 1 ms./DIV.

Condition
  • Power switch on (IG)
  • Blower switch: LO

(b) Waveform 2:

Item

Content

Terminal No.

G35-14 (LIN1) - G35-4 (GND)

Tool Setting

2 V/DIV., 20 ms./DIV.

Condition

Power switch on (IG)

(c) Waveform 3:

Item

Content

Terminal No.

z9-3 (BUS) - z9-2 (BUS G)

Tool Setting

2 V/DIV., 2 ms./DIV.

Condition

Power switch on (IG)

CHECK AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY)

HINT:

Check from the rear of the connector while it is connected to the air conditioning control panel (radio and display receiver assembly).

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

G20-2 (IG+) - G20-6 (GND)

GR - W-B

Power source (IG)

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

G20-3 (+B) - G20-6 (GND)

L - W-B

Power source (Back-up)

Power switch off

11 to 14 V

G20-6 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control panel (radio and display receiver assembly)

Always

Below 1 V

G20-8 (LIN1) - Body ground

LG - Body ground

LIN communication signal

Power switch on (IG)

Pulse generation

(See waveform)

G20-10 (ACC) - G20-6 (GND)

P - W-B

Power source (ACC)

Power switch off

Below 1 V

Power switch on (ACC)

11 to 14 V

G20-11 (ILL+) - Body ground

W - Body ground

Illumination signal

Taillight off

Below 1 V

Taillight on

11 to 14 V

G20-15 (ILL-) - Body ground

B - Body ground

Illumination signal

Always

Below 1 V

(a) Waveform:

Item

Content

Terminal No.

G20-8 (LIN1) - Body ground

Tool Setting

2 V/DIV., 20 ms./DIV.

Condition

Power switch on (IG)

HYBRID VEHICLE CONTROL ECU ASSEMBLY

Click here 2019 MY Avalon HV [04/2018 - 08/2019]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): TERMINALS OF ECU