FORD 2008 Mustang v.1 - Manual (Page 86)

Note: Replacement of the battery will not cause the remote transmitter
to become deprogrammed from your vehicle. The remote transmitter
should operate normally after battery replacement.
Replacing lost remote entry transmitters
If you would like to have your remote entry transmitter reprogrammed
because you lost one, or would like to buy additional remote entry
transmitters, you can either reprogram them yourself, or take all
remote entry transmitters to your authorized dealer for
reprogramming.
How to reprogram your remote entry transmitters
You must have all remote entry transmitters (maximum of six)
available before beginning this procedure.
Note: Ensure the brake pedal is not
depressed during this sequence.
To reprogram the remote entry
transmitters:
1. Ensure the vehicle is
electronically unlocked.
2. Put the key in the ignition.
3. Cycle eight times rapidly (within
10 seconds) between the 1
(OFF/LOCK) position and 3 (ON).
Note: The eighth turn must end in the 3 (ON) position. The doors will
lock, then unlock, to confirm that the programming mode has been
activated.
4. Within 20 seconds press any button on the remote entry transmitter.
Note: If more than 20 seconds have passed you will need to start the
procedure over again. The doors will lock, then unlock, to confirm that
this remote entry transmitter has been programmed.
5. Repeat Step 4 to program each additional remote entry transmitter.
6. Turn the ignition to the 1 (OFF/LOCK) position after you have
finished programming all of the remote entry transmitters. Note: After
20 seconds, you will automatically exit the programming mode. The
doors will lock, then unlock, to confirm that the programming mode has
been exited.
2008 05+ Mustang (197)
Owners Guide (post-2002-fmt)
USA (fus)
Locks and Security
86