Looks like I was right.
Quote:
Independent Heating
Generates comfortable warmth inside the vehicle before you start a journey in the winter months. During the startup phase the engine is protected and fuel consumption reduced by the preheated cooling circuit. Switched on with control display, ThermoCall or the remote control. These controls can also be used to activate the independent ventilation function.
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You could use your phone to call the car and initiate the heater. It also comes with a BMW remote control which could be used to start the heater.