[For those just looking for the information, scroll down to see how to change it. The first few paragraphs are just introductory ramblings.] The last time I took my 2002 Volkswagen Passat to the dealer, one of the things I had them do was replace the battery in the key fob (the remote entry and alarm device). It cost me close to $50 to replace. When I asked the service guy what the deal was, he said that they had to reprogram it, and that's what the fee was for. Obviously I though it was BS, but I let it go. However, the next time I needed the battery replaced I vowed that I would do it myself. [And by the way, I won't name the dealer that charged me the $50, but I do live in Dublin.] Thankfully, the internet provides great DYI advice. The only problem was that there was no pictures associated with the advice I found. Hence this post. But first, the usual disclaimers. This worked for me. If it doesn't work for you, then you might have a different issue. I'm not a mechanic, nor do I claim to be one. And the advice is provided "AS IS". Okay, on with the show.