Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028C4S |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [11/2022 -
] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] |
TERMINALS OF ECU
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
Channel 1 (m3)
Terminal No.
(Symbol)
|
Terminal Description
|
Condition
|
Specified Condition
|
m3-2 (BUSG) - Body ground
|
Ground for BUS IC
|
Always
|
Below 1 Ω
|
m3-3 (BUS) - m3-2 (BUSG)
|
BUS IC control signal
|
Ignition switch ON
|
Pulse generation
(See waveform "Servo LIN communication")
|
m3-4 (BUSB) - m3-2 (BUSG)
|
Power supply for BUS IC
|
Ignition switch off
|
11 to 14 V
|
m3-5 (SG-3) - Body ground
|
Ground for evaporator temp. sensor (No. 1 cooler thermistor)
|
Always
|
Below 1 Ω
|
m3-6 (TE) - m3-5 (SG-3)
|
Evaporator temp. sensor (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
|
Channel 2 (I49)
Terminal No.
(Symbol)
|
Terminal Description
|
Condition
|
Specified Condition
|
I49-2 (CANH) - I49-1 (CANL)
|
CAN communication system
|
Ignition switch ON
|
Pulse generation
|
I49-5 (B) - I49-17 (GND)
|
Power source (Back-up)
|
Ignition switch off
|
11 to 14 V
|
I49-6 (IG+) - I49-17 (GND)
|
Power source (IG)
|
Ignition switch ON
|
11 to 14 V
|
Ignition switch off
|
Below 1 V
|
I49-7 (LIN1) - I49-17 (GND)
|
LIN communication signal
|
Ignition switch ON
|
Pulse generation
(See waveform "Control panel LIN communication")
|
I49-17 (GND) - Body ground
|
Ground for main power supply
|
Always
|
Below 1 Ω
|
I49-18 (SOL+) - Body ground
|
Compressor solenoid operation signal
|
-
Engine running
-
Blower switch: LO
-
A/C switch: On
|
Pulse generation
(See waveform "Compressor solenoid")
|
I49-21 (BLW) - I49-17 (GND)
|
Blower motor speed control signal
|
-
Ignition switch ON
-
Blower switch: LO
|
Pulse generation
(See waveform "Blower")
|
Channel 3 (I48)
Terminal No.
(Symbol)
|
Terminal Description
|
Condition
|
Specified Condition
|
I48-1 (TAM) - I48-14 (SG-2)
|
Ambient temp. sensor (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
|
I48-6 (PRE) - I48-15 (SG-4)
|
Air conditioning pressure sensor signal
|
-
Engine running
-
Air conditioning system operating
-
Refrigerant pressure: Normal pressure
|
0.74 to 4.61 V
|
I48-11 (S5-3) - I48-15 (SG-4)
|
Power supply for air conditioning pressure sensor
|
Ignition switch ON
|
4.75 to 5.25 V
|
Ignition switch off
|
Below 1 V
|
I48-14 (SG-2) - Body ground
|
Ground for ambient temp. sensor (thermistor assembly)
|
Always
|
Below 1 Ω
|
I48-15 (SG-4) - Body ground
|
Ground for air conditioning pressure sensor
|
Always
|
Below 1 Ω
|
(a) Waveform "Servo LIN communication":
Item
|
Content
|
Terminal No.
|
m3-3 (BUS) - m3-2 (BUS G)
|
Tool Setting
|
2 V/DIV., 2 ms./DIV.
|
Condition
|
Ignition switch ON
|
(b) Waveform "Compressor solenoid":
Item
|
Content
|
Terminal No.
|
I49-18 (SOL+) - Body ground
|
Tool Setting
|
5 V/DIV., 500 ms./DIV.
|
Condition
|
-
Engine running
-
Blower switch: LO
-
A/C switch: On
|
(c) Waveform "Control panel LIN communication":
Item
|
Content
|
Terminal No.
|
I49-7 (LIN1) - I49-17 (GND)
|
Tool Setting
|
2 V/DIV., 20 ms./DIV.
|
Condition
|
Ignition switch ON
|
(d) Waveform "Blower":
Item
|
Content
|
Terminal No.
|
I49-21 (BLW) - I49-17 (GND)
|
Tool Setting
|
2 V/DIV., 1 ms./DIV.
|
Condition
|
-
Ignition switch ON
-
Blower switch: LO
|
HINT:
The waveform varies with the blower speed.
CHECK AIR CONDITIONING CONTROL ASSEMBLY
Terminal No.
(Symbol)
|
Terminal Description
|
Condition
|
Specified Condition
|
I37-7 (LIN1) - Body ground
|
LIN communication signal
|
Ignition switch ON
|
Pulse generation
(See waveform)
|
I37-9 (IG+) - I37-13 (GND)
|
Power source (IG)
|
Ignition switch off
|
Below 1 V
|
Ignition switch ON
|
11 to 14 V
|
I37-13 (GND) - Body ground
|
Ground for air conditioning control assembly
|
Always
|
Below 1 V
|
(a) Waveform:
Item
|
Content
|
Terminal No.
|
I37-7 (LIN1) - Body ground
|
Tool Setting
|
2 V/DIV., 20 ms./DIV.
|
Condition
|
Ignition switch ON
|
|