I am a new owner to a 99. I have one key fob that has no guts except for the communication pill that will start the car. I have another fob that has all guts and good battery that will only turn the lock, it will not start the car .Central locking does not work. There is some kind of aftermarket remote start BS that I have not traced down yet. I am considering taking the pill out of the working key and taping it in the car just in case i loose the working key. Where would it need to mount it to work? Does communication happen in the lock?
I replaced my own buttons using this youtube video and the parts they link to. Probably the easiest soldering job I've had to do, and I'm not great at soldering. Worked well first try.