FORD 2002 F-150 v.2 - Manual (Page 107)

Power door lock disable feature
This feature will help protect your vehicle from unauthorized entry.
The UNLOCK function on the power door switch will not operate with
the ignition OFF and twenty seconds after the doors are closed and
electronically locked by the remote entry transmitter, key pad, or power
door switch (if pressed while the door was open).
The UNLOCK function will operate again after you unlock the vehicle
using the remote entry transmitter or key pad, turn the ignition to ON,
or open the door from inside of the vehicle.
Deactivating/activating power door lock disable feature
This feature may be deactivated/activated by an authorized dealer.
Locks and Security
107