Ford 2010 F-150 Owner's Manual page 128

Locks and Security
Using MyKey™ with remote start systems
MyKey™ is not compatible with non-Ford approved aftermarket remote
start systems. If you choose to install a remote start system please see
your authorized dealer for a Ford approved remote start system.
When using a Ford-approved remote start system, the default settings
will recognize the remote start system as an additional admin key with
its associated privileges. You should program the remote start system as
a MyKey™ in addition to the key that you have already programmed as a
MyKey™. To program the remote start system as MyKey™, do the
following:
1. Enter the vehicle and close all doors.
2. Remote start the vehicle using a remote start fob.
3. Follow Steps 1-4 in the Create a MyKey™ section.
Note: For all vehicles, the number of MYKEY(S) PROGRAMMED or
ADMIN KEYS PROGRAMMED that is displayed in the MyKey™ system
status menus will include the remote start system as an additional key in
the total count. See the Check MyKey™ system status section.
Note: For all vehicles with remote start installed, it is possible to
program all original vehicle keys as MyKeys™, in which case, you will
need to use your remote start system to reset all MyKeys™ as admin
keys by doing the following:
1. Enter the vehicle, close all doors.
2. Remote start the vehicle using your remote start fob.
3. Follow Steps 1-4 in the Disable MyKey™ section.
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2010 F-150 (f12)
Owners Guide, 1st Printing
USA (fus)