Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (HVAC SYSTEM (DIAGNOSTICS) (HEV))CONTROL MODULE I/O SIGNALELECTRICAL SPECIFICATIONA/C CONTROL PANEL
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans
A/C Control Panel
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION A/C Control Panel
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.
| Terminal No. | Contents | Measuring condition | Standard |
|---|---|---|---|
| (i80) No. 1 (+) ←→ Chassis ground (-) | Ignition power supply | Ignition switch: ON | Battery voltage |
| (i80) No. 2 (+) ←→ Chassis ground (-) | Battery power supply | Always | Battery voltage |
| (i80) No. 3 (+) ←→ Chassis ground (-) | GND terminal | Always | Less than 0.5 V |
| (i80) No. 4 | - | - | - |
| (i80) No. 5 (+) ←→ Chassis ground (-) | [Blower motor control signal | Ignition switch: ON Blower switch: ON | 0 - 16 V |
| (i80) No. 6 (+) ←→ Chassis ground (-) | Blower motor voltage feedback | Ignition switch: ON Blower switch: ON | 0 - 16 V |
| (i80) No. 7 | - | - | - |
| (i80) No. 8 | - | - | |
| (i80) No. 9 | - | - | |
| (i80) No. 10 (+) ←→ Chassis ground (-) | Sunload sensor | Ignition switch: ON Sunlight is contacting sensor | With sunload: Less than 4.9 V Without sunload: 0 V |
| (i80) No. 11 (+) ←→ Chassis ground (-) | Mode door actuator position signal | Ignition switch: ON Mode door: VENT position | 4.5 V |
| Ignition switch: ON Mode door: DEF position | 0.5 V | ||
| (i80) No. 12 (+) ←→ Chassis ground (-) | Intake door actuator position signal | Ignition switch: ON FRESH/RECIRC door: RECIRC position | 4.5 V |
| Ignition switch: ON FRESH/RECIRC door: FRESH position | 1.9 V | ||
| (i80) No. 13 (+) ←→ Chassis ground (-) | In-vehicle sensor | Ignition switch: ON | 25°C (77°F): Approx. 1.5 V 40°C (104°F): Approx. 1.0 V |
| (i80) No. 14 | - | - | - |
| (i80) No. 15 | - | - | - |
| (i80) No. 16 | - | - | - |
| (i80) No. 17 | - | - | - |
| (i80) No. 18 | - | - | - |
| (i80) No. 19 | A/C control panel communication (Tx) | Cannot be measured (digital signal) | - |
| (i80) No. 20 | A/C control panel communication (Rx) | Cannot be measured (digital signal) | - |
| (i80) No. 21 (+) ←→ Chassis ground (-) | ACC power supply | Ignition switch: ACC | Battery voltage |
| (i80) No. 22 (+) ←→ Chassis ground (-) | Heater core sensor | Ignition switch ON (fluctuates depending on temperature after the heater core) | 0.2 - 4.8 V |
| (i80) No. 23 | - | - | - |
| (i80) No. 24 (+) ←→ Chassis ground (-) | Air mix door actuator position signal | Ignition switch: ON Air mix door: MAX COOL | 4.5 V |
| Ignition switch: ON Air mix door: MAX HOT | 0.5 V | ||
| (i80) No. 25 (+) ←→ Chassis ground (-) | Evaporator sensor | Ignition switch: ON | 1 - 4.5 V (changes depending on evaporator temperature) |
| (i80) No. 26 | - | - | - |
| (i80) No. 27 | - | - | - |
| (i80) No. 28 | - | - | - |
| (i181) No. 1 | - | - | - |
| (i181) No. 2 | CAN communication-L (CAN communication line) | Cannot be measured (digital signal) | - |
| (i181) No. 3 | CAN communication-H (CAN communication line) | Cannot be measured (digital signal) | - |
| (i181) No. 4 (+) ←→ (i181) No. 28 (-) | Mode door actuator drive signal (VENT) | While operating to VENT side | While operating: 12 V While not operating: 0 V |
| (i181) No. 5 (+) ←→ (i181) No. 18 (-) | Air mix door actuator drive signal (HOT) | While operating to HOT side | While operating: 12 V While not operating: 0 V |
| (i181) No. 6 | - | - | - |
| (i181) No. 7 (+) ←→ Chassis ground (-) | Sensor and actuator power supply | Ignition switch: ON | 5 V |
| (i181) No. 8 (+) ←→ Chassis ground (-) | Pressure sensor | Ignition switch: ON | 0.5 - 4.9 V |
| (i181) No. 9 | - | - | - |
| (i181) No. 10 | - | - | - |
| (i181) No. 11 (+) ←→ Chassis ground (-) | [Blower relay drive output | Ignition switch: ON [lower switch: ON | 0.7 V or less |
| (i181) No. 12 (+) ←→ Chassis ground (-) | PTC heater 1 relay drive signal | Ignition switch: ON [lower switch: ON Drive cycle: Heating Electric heater operation prohibition request: None | 1 V or less |
| (i181) No. 13 | - | - | - |
| (i181) No. 14 (+) ←→ Chassis ground (-) | PTC heater 3 relay drive signal | Ignition switch: ON [lower switch: ON Drive cycle: Heating Electric heater operation prohibition request: None | 1 V or less |
| (i181) No. 15 (+) ←→ Chassis ground (-) | Radiator fan relay drive output | Ignition switch: ON | 9 - 16 V (RCC: 0.7 V or less when operation is requested from engine side) |
| (i181) No. 16 | - | - | - |
| (i181) No. 17 (+) ←→ (i181) No. 30 (-) | Intake door actuator drive signal (RECIRC) | While operating to RECIRC side | While operating: 12 V While not operating: 0 V |
| (i181) No. 18 (+) ←→ (i181) No. 5 (-) | Air mix door actuator drive signal (COOL) | While operating to COOL side | While operating: 12 V While not operating: 0 V |
| (i181) No. 19 (+) ←→ Chassis ground (-) | Sensor GND | Always | Less than 0.5 V |
| (i181) No. 20 | - | - | - |
| (i181) No. 21 | LIN communication (heat pump control module) | Cannot be measured (digital signal) | - |
| (i181) No. 22 | - | - | - |
| (i181) No. 23 (+) ←→ Chassis ground (-) | PTC heater 2 relay drive signal | Ignition switch: ON Blower switch: ON Drive cycle: Heating Electric heater operation prohibition request: None | 1 V or less |
| (i181) No. 24 | - | - | - |
| (i181) No. 25 | - | - | - |
| (i181) No. 26 | - | - | - |
| (i181) No. 27 | - | - | - |
| (i181) No. 28 (+) ←→ (i181) No. 4 (-) | Mode door actuator drive signal (DEF) | While operating to DEF side | While operating: 12 V While not operating: 0 V |
| (i181) No. 29 | - | - | - |
| (i181) No. 30 (+) ←→ (i181) No. 17 (-) | Intake door actuator drive signal (FRESH) | While operating to FRESH side | While operating: 12 V While not operating: 0 V |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.