Vehicle properties
HVAC & climate
HVAC_MAX_AC_ON
What it is
On/off max AC
When MAX AC is on, the ECU may adjust the vent position, fan speed, temperature, etc as necessary to cool the vehicle as quickly as possible. Any parameters modified as a side effect of turning on/off the MAX AC parameter shall generate onPropertyEvent() callbacks to the VHAL.
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 0x15200506 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x05000000 | SEAT |
| Type | 0x00ff0000 | 0x00200000 | BOOLEAN |
| Ordinal | 0x0000ffff | 0x00000506 | 0x506 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
boolean value =
mgr.getBooleanProperty(VehiclePropertyIds.HVAC_MAX_AC_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.