Trunk Remote Unlock (328i & 330i)
The trunk can be opened from inside the vehicle by pressing the remote trunk button when the vehicle is unlocked or single locked from the central lock button.
The remote trunk button is locked out when the trunk is locked in the hotel setting and when the GM detects a vehicle speed signal more than 4 MPH via the K-bus.
The switch provides the GM with a momentary ground signal when pressed.