My spare remote did not work and I changed the batteries for brand new batteries (expiration 2028) and cleaned the metal contacts with an alcohol pad and still no luck. I dreaded having to buy a used one on eBay and having to reprogram both remotes. I finally removed the circuit board from the FOB and saw the inner part of the rubber buttons on the FOB case looked different, presumably due to oxidation or other degenerative process. The circuit board does not have a physical switch on it, it seems the circuit is completed by depressing the rubber button to make contact and complete the circuit. I assume the back of the rubber button must have some conductive properties to complete the circuit. I cleaned the inner part of the rubber buttons with alcohol wipes and now my remote is working. Anyone have similar experience? Maybe there is something better than an alcohol wipe, but this seemed to work. I tried to look up this on the internet and I did not find anyone discussing this as a fix. To anyone who has better knowledge of the FOB mechanism, what do you think?

Back of the circuit board.

Inner part of FOB case with back part of physical buttons

 

You can see in your photo where the rubber contacts have worn away on the two most commonly used buttons (lock/unlock) - that is the problem I think. Lots of people put in a bit of foil to take up the slack but, based on something I saw on another post, I ordered some of these from Amazon:


I sanded back the existing contacts a little and glued these on and my fobs work perfectly now. I'm sure you'll be able to get the equivalents in US. There's enough in there to fix 20 fobs!

 

The key to cleaning the circuit board is to use the right cleaning solution. You really do not want to use water
at all.. Use either rubbing alcohol or a commercial contact cleaner, which you can find at most electronics stores.
Dab the contact cleaner on the circuit board with a paper towel or use a cotton swab to gently wipe off any gunk
with the rubbing alcohol. Make certain your swab is intact and that no fuzz ends up on the circuit board. You
should not need to dry the circuit board since the cleaning solution should evaporate on its own quickly.

 

Thank you. Never knew anything like this existed.