Folding down head restraints
Extending/retracting head
restraint
Only fold down head restraint if no passengers are in the rear. Fold out retracted headrests again if passengers are being carried in the rear; otherwise, there is increased risk of injury in the event of an accident.

▷ To lower flaps: press the button, arrow 1, and press down the head restraint.
▷ Fold back up: pull up head restraints.
See also:
Audio/video playback
Audio
Audio can be played back via rear entertainment
from any source in the vehicle.
Operation is the same as for the front audio playback.
Video
Video can be played back in the rear from the
...
Configuring the devices
Additional functions can be activated or deactivated
for paired and connected devices.
1. "Telephone"
2. "Bluetooth® (phone)"
3. Highlight the device to be configured.
4. Ope ...
Under the Hood
The 640i is powered by a 315-horsepower, turbocharged 3.0-liter six-cylinder
engine. Its peak torque rating is 332 pounds-feet. BMW cites a zero to 60 mph
time of 5.5 seconds for both the coupe an ...
