I did. Not entirely sure if it's necessary, but better safe than sorry. Just make sure the passenger door is already open when you disconnect so you can get into it, and have the fob ready when you reconnect it because the alarm immediately goes off once reconnected (at least mine did). I don't believe it messed with any of the entertainment settings, presets, etc. At worst it may have forgotten my "home" gps for charging schedule, but I reset that immediately with ease and it definitely didn't forget the schedule i had set.Did you disconnect the 12 volt battery before removing the controller?