Hi, I just purchased a 2004 Chevy Trailblazer from a private seller. The vehicle is equipped with a remote starter with 2 remotes. The lady I purchased the vehicle from said that the batteries in the remotes need to be replaced and then it should work fine. Well I replaced the batteries in the remotes & they do not do anything. The light on the remote shows it has power, but none of the buttons work for my vehicle. Do I need to somehow program the remote to my vehicle? If so how would I do this? Thanks for the help I really appreciate it.