Lincoln 2009 MKS Owner's Manual page 219

Driving
Note: You cannot immediately start your vehicle from the on mode. If
you would like to start the vehicle and you are in on mode, you must
first switch the vehicle off by pressing the START/STOP button.
3. To Start your vehicle's engine, press the START/STOP button (for any
length of time) while applying the brake pedal.
4. To switch Off your vehicle when it is in accessory or on modes or
when the engine is running, press and release the START/STOP button.
Note: When the vehicle is in motion, a single press and release of the
START/STOP button will not switch off the engine. In order to switch off
the engine of a vehicle while in motion, press and hold the START/STOP
button for at least one second.
Note: The indicator light on the start button will illuminate when the
vehicle is in on mode and when the engine is started.
There may be areas inside your vehicle where the IA key is not detected.
If the message NO FOB DETECTED appears on your message center
when you press the START/STOP button, it may be necessary to move
your IA key to another area within the vehicle. The IA key may not be
detected near the roof (between the driver or passenger sunvisor and
the roof, or in the overhead console area) or in the extreme corners of
the rear package tray, near your audio speakers. It is not recommended
that you stow the IA key in these locations. If you move the IA key to a
location where it has been detected before and you still see the NO FOB
DETECTED message, your IA key's battery may be low or you may be in
an area with excessive radio frequency interference. If this occurs, you
can use the backup method to start your vehicle (see below).
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