Passenger Compartment Trunk Lid Release Button (TOEHKI).
The interior trunk release button is located in the iDrive Driving Area to the left of the steering column. It provides a momentary ground signal to the CAS when pressed.
The signal is passed on to the PM over the K-CAN-P.
The button is active from KL R when the hotel setting is off and the vehicle speed is below 2 mph.