Hi guy's it's been a while since I have used my spare key, but as I couldn't find the one I use on a regular basis I had no choice. Anyway I couldn't unlock the car with fob but the red light did light up, I then opened door using lock and started the car. Went and bought a new battery for the fob but now I couldn't unlock with fob and when I unlock in car the alarm goes off. I found other key and turned off alarm but any ideas.