Ford 2006 Mountaineer Owner's Manual page 107

Locks and Security
2. Do not wipe off any grease on the
battery terminals on the back
surface of the circuit board.
3. Remove the old battery. Note: Please refer to local regulations when
disposing of transmitter batteries.
4. Insert the new battery. Refer to the diagram inside the remote entry
transmitter for the correct orientation of the battery. Press the battery
down to ensure that the battery is fully seated in the battery housing
cavity.
5. Snap the two halves back together.
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. If all remote entry transmitters
are not present during the programming procedure, the transmitters that
are not present during programming will no longer operate the vehicle.
107
2006 Mountaineer (mnt)
Owners Guide (post-2002-fmt)
USA (fus)