It's hidden in a nonsensical menu for climate control:
Enabling the automatic engine start function
The automatic engine start must be enabled before
using the system. Otherwise, the engine cannot switch on automatically
to climatize the car's interior.
Via iDrive:
1. "CAR"
2. "Settings"
3. "Climate control"
4. "Preconditioning/ventilation"
5. If necessary, "Remote Engine Start"
6. "Starting engine for clim. control"
7. Confirm the disclaimer.
and then
Via vehicle key
The system can be switched on and off using
the vehicle key.
Press the button on the vehicle key three
times within 1 second.
After operating the vehicle key, it will take approximately
3 seconds until the engine is switched on.
To switch off the system, press the button again
three times.
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