FORD 2005 F-150 v.1 - Manual (Page 103)

5. Within 10 seconds of removing the second coded key, insert the new
unprogrammed key (new key/valet key) into the ignition and turn the
ignition from the 1 (OFF/LOCK) position to the 3 (ON) position
(maintain ignition in the 3 (ON) position for at least one second, but no
more than ten seconds). This step will program your new key to a coded
key.
6. To program additional new unprogrammed key(s), repeat this
procedure from Step 1.
If successful, the new coded key(s) will start the vehicle’s engine and the
theft indicator will illuminate for three seconds and then go out.
If not successful, the new coded key(s) will not start the vehicle’s engine
and the theft indicator will flash on and off and you may repeat Steps 1
through 5. If failure repeats, bring your vehicle to your dealership to
have the new spare key(s) programmed.
REVIEW COPY
2005 F150 (f12), Owners Guide (post-2002-fmt) (own2002),
Market: USA_English (fus)
Locks and Security
103