1. Locate the key fob's battery compartment. It is usually located on the back of the key fob and has a small, round cover.
2. Use a small screwdriver or other thin object to pry open the battery compartment cover.
3. Remove the old battery from the compartment.
4. Insert the new battery into the compartment, making sure that the positive (+) and negative (-) terminals are correctly aligned.
5. Close the battery compartment cover.
6. Test the key fob to make sure that it is working properly.
Here are some additional tips for changing the battery in your 2007 Passat key fob:
* Use a new battery that is the same size and type as the old battery.
* Be careful not to damage the key fob or the battery compartment when prying open the cover or inserting the new battery.
* If the key fob still does not work after changing the battery, you may need to have it reprogrammed by a Volkswagen dealer.
