Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000ZPCZ
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: TERMINALS OF ECU; 2017 - 2020 MY Sienna [08/2016 -        ]

TERMINALS OF ECU

1. AIR CONDITIONING AMPLIFIER

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D75-1 (IG+) - D75-14 (GND)

R - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

D75-2 (SOL+) - D75-14 (GND)

L - W-B

A/C compressor solenoid operation signal
  • Engine running
  • A/C switch: on
  • Blower switch: LO

Pulse generation

(See waveform 1)

D75-3 (PTC2) - D75-14 (GND)

Y - W-B

Quick heater assembly operation signal
  • Engine running
  • Temperature setting: MAX HOT
  • Ambient temperature: 10°C (50°F) or lower
  • Engine coolant temperature: 70°C (158°F) or lower
  • Light control switch off
  • Blower switch: on

Below 1 V
  • Engine running
  • Temperature setting: MAX HOT
  • Ambient temperature: 10°C (50°F) or lower
  • Engine coolant temperature: 70°C (158°F) or lower
  • Light control switch off
  • Blower switch: off

11 to 14 V

D75-5 (TAM) - D75-14 (GND)

B - W-B

Ambient temperature sensor signal
  • Ignition switch ON
  • Ambient temperature: 25°C (77°F)

1.35 to 1.75 V
  • Ignition switch ON
  • Ambient temperature: 40°C (104°F)

0.9 to 1.2 V

D75-8 (LOCK) - D75-14 (GND)

W - W-B

A/C compressor lock sensor signal
  • Engine running
  • Blower switch: LO
  • A/C switch: on

Pulse generation

(See waveform 2)

D75-9 (PRE) - D75-13 (SG-2)

V - W

A/C pressure sensor signal
  • Engine running
  • Air conditioning system operating
  • Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm2, 439 psi))

4.71 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 4.71 V

D75-10 (S5-3) - D75-13 (SG-2)

LG - W

Power supply for A/C pressure sensor
  • Ignition switch ON
  • A/C switch: on

4.75 to 5.25 V
  • Ignition switch ON
  • A/C switch: off

Below 1 V

D75-11 (CANH) - D75-12 (CANL)

G - W

CAN communication system

CAN communication circuit

Pulse generation

D75-13 (SG-2) - Body ground

W - Body ground

Ground for A/C pressure sensor, A/C ambient temperature sensor, A/C lock sensor

Always

Below 1 V

D75-14 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 V

D75-20 (MGC) - D75-14 (GND)

R - W-B

A/C compressor magnetic clutch operation signal
  • Ignition switch ON
  • Blower switch: LO
  • A/C switch: off

11 to 14 V
  • Ignition switch ON
  • Blower switch: LO
  • A/C switch: on

Below 1 V

D75-21 (B) - D75-14 (GND)

P - W-B

Power source (Back-up)

Always

11 to 14 V

D75-22 (BLW) - D75-14 (GND)

P - W-B

Blower motor speed control signal

Ignition switch ON

Blower switch: on

Pulse generation

(See waveform 3)

D75-29 (TR) - D75-34 (SG-4)

G - W

Cooler (room temp. sensor) thermistor signal
  • Ignition switch ON
  • Cabin temperature: 25°C (77°F)

1.8 to 2.2 V
  • Ignition switch ON
  • Cabin temperature: 40°C (104°F)

1.2 to 1.6 V

D75-32 (TSP) - D75-14 (GND)

B - W-B

Solar sensor signal (for Front passenger side)

Ignition switch ON

Solar sensor subjected to electric light

0.8 to 4.3 V

Ignition switch ON

Solar sensor covered with a cloth

Below 0.8 V

D75-33 (TSD) - D75-14 (GND)

Y - W-B

Solar sensor signal (for Driver side)

Ignition switch ON

Solar sensor subjected to electric light

0.8 to 4.3 V

Ignition switch ON

Solar sensor covered with a cloth

Below 0.8 V

D75-34 (SG-4) - Body ground

W - Body ground

Ground for cooler (room temp. sensor) thermistor

Always

Below 1 V

D75-36 (PTC3) - D75-14 (GND)

G - W-B

Quick heater assembly operation signal
  • Engine running
  • 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
  • Engine running
  • 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 14 V

D75-37 (LIN1) - D75-14 (GND)

LG - W-B

LIN communication signal

Ignition switch ON

Pulse generation

D75-40 (PTC1) - D75-14 (GND)

V - W-B

Quick heater assembly operation signal
  • Engine running
  • 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

Below 1 V
  • Engine running
  • 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: off

11 to 14 V

D186-1 (RBUS) - D186-25 (RBUG)

V - P

BUS IC control signal (for Rear)

Ignition switch ON

Pulse generation

D186-5 (TEC) - D186-7 (SGND)

SB - G

Rear evaporator temperature sensor signal
  • Ignition switch ON
  • Rear evaporator temperature: 0°C (32°F)

2.0 to 2.4 V
  • Ignition switch ON
  • Rear evaporator temperature: 15°C (59°F)

1.4 to 1.8 V

D186-7 (SGND) - Body ground

G - Body ground

Ground for rear evaporator temperature sensor

Always

Below 1 V

D186-16 (RLIN) - D186-24 (GND2)

L - W-B

LIN communication signal

Ignition switch ON

Pulse generation

D186-20 (TR) - D186-8 (RGND)

G - Y

Rear room temperature sensor signal
  • Ignition switch ON
  • Cabin temperature: 25°C (77°F)

1.8 to 2.2 V
  • Ignition switch ON
  • Cabin temperature: 40°C (104°F)

1.2 to 1.6 V

D186-24 (GND2) - Body ground

W-B - Body ground

Ground for power supply

Always

Below 1 V

D186-25 (RBUG) - Body ground

P - Body ground

Ground for BUS IC (for Rear)

Always

Below 1 V

D186-26 (BLWH) - D186-24 (GND2)

L - W-B

Rear blower motor control signal
  • Ignition switch ON
  • Rear blower switch: on

Pulse generation

(See waveform 3)

D186-27 (RBBU) - D186-25 (RBUG)

GR - P

Power supply for BUS IC (for Rear)

Ignition switch ON

11 to 14 V

D186-28 (+B2) - D186-24 (GND2)

P - W-B

Power source (Back-up)

Always

11 to 14 V

z1-2 (BUS G) - Body ground

-

Ground for BUS IC

Always

Below 1 V

z1-3 (BUS) - z1-2 (BUS G)

-

BUS IC control signal

Ignition switch ON

Pulse generation

z1-4 (B BUS) - z1-2 (BUS G)

-

Power supply for BUS IC

Ignition switch off

11 to 14 V

z1-4 (B BUS) - z1-2 (BUS G)

-

Power supply for BUS IC

Ignition switch ON

11 to 14 V

z1-5 (SGA) - Body ground

-

Ground for evaporator temperature sensor

Always

Below 1 V

z1-6 (TEA) - z1-5 (SGA)

-

A/C evaporator temperature sensor 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

(a) Waveform 1:

Item

Content

Terminal No.

D75-2 (SOL+) - D75-14 (GND)

Tool Setting

5 V/DIV., 500 μs/DIV.

Vehicle Condition
  • Engine running
  • Blower switch: LO
  • A/C switch: on

(b) Waveform 2:

Item

Content

Terminal No.

D75-8 (LOCK) - D75-14 (GND)

Tool Setting

200 mV/DIV., 10 ms./DIV.

Vehicle Condition
  • Engine running
  • Blower switch: LO
  • A/C switch: on

(c) Waveform 3:

Item

Content

Terminal No.

D75-22 (BLW) - D75-14 (GND)

D186-26 (BLWH) - D186-24 (GND2)

Tool Setting

1 V/DIV., 500 μs/DIV.

Vehicle Condition
  • Ignition switch ON
  • Blower switch: on

2. AIR CONDITIONING CONTROL ASSEMBLY (for Front)

HINT:

Check from the rear of the connector while it is connected to the air conditioning control assembly (for front).

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D69-8 (LIN1) - D69-5 (GND)

LG - W-B

LIN communication signal

Ignition switch ON

Pulse generation

D69-5 (GND) - Body ground

W-B - Body ground

Ground for front air conditioning control assembly

Always

Below 1 V

D69-4 (IG+) - D69-5 (GND)

R - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

3. NO. 2 AIR CONDITIONING CONTROL ASSEMBLY

HINT:

Check from the rear of the connector while it is connected to the No. 2 air conditioning control assembly.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

T7-2 (RLIN) - T7-4 (E)

L - W-B

LIN communication signal (for Rear)

Ignition switch ON

Pulse generation

T7-1 (IG) - T7-4 (E)

R - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

T7-4 (E) - Body ground

W-B - Body ground

Ground for rear A/C control assembly

Always

Below 1 V