2003 Mercury Mountaineer Owner Guide 1st Printing (Spanish) - Page 374

Locks and Security To replace the battery: 1. Twist a thin coin between the two halves of the remote entry transmitter near the key ring. DO NOT TAKE THE FRONT PART OF THE REMOTE ENTRY TRANSMITTER APART. 2. Remove the old battery. 3. Insert the new battery. Refer to the diagram inside the remote entry transmitter for the correct orientation of the battery. 4. 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 four) available before beginning this procedure. To reprogram the remote entry 3 transmitters: 2 4 1 1. Ensure the vehicle is electronically unlocked. 2. Put the key in the ignition. 3. Turn the key from the 1 (LOCK) position to 3 (ON). 87