Diagnosis Mode (PAD) for G Chassis BMW Vehicles

Starting with the G chassis vehicles like the BMW 7 Series (G11/G12) in order to scan the vehicle the car must be put into a diagnosis mode (PAD mode). This is performed by pressing the Start/Stop button 3 times in a row in under .8 seconds. This shall keep the key on and give you the equivalency of "Terminal 15" and should allow you to enter normal diagnosis with the scan tool.

check this link out for more info