Installing a remote start in 1997 and newer Cadillacs Poor range of an aftermarket remote alarm If the range on your alarm's remote is less than it used to be, chances are the battery in the remote needs to be replaced.
Weak batteries are usually the cause of decreased range on remote alarms.
There may also be added engine noise even on the FM band. The cause is water entering the coaxial cable from the antenna to the head unit. The solution is to change the antenna. If you are using your navigation system when the GPS satellites are being reprogrammed, your system may lock up. The solution is to first remove the navigation CD-ROM from the unit, then disconnect power from the navigation system for an hour.