Vehicle properties
HVAC & climate
HVAC_AUTO_RECIRC_ON
What it is
Automatic recirculation on/off
When automatic recirculation is ON, the HVAC system may automatically switch to recirculation mode if the vehicle detects poor incoming air quality.
This property is defined as VehiclePropertyAccess.READ_WRITE, but OEMs have the option to implement it as VehiclePropertyAccess.READ only.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x15200512 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x05000000 | SEAT |
| Type | 0x00ff0000 | 0x00200000 | BOOLEAN |
| Ordinal | 0x0000ffff | 0x00000512 | 0x512 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
boolean value =
mgr.getBooleanProperty(VehiclePropertyIds.HVAC_AUTO_RECIRC_ON, areaId);This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.