Aftermarket alarm system?? If so it could be anything with that alarm. If it's the factory security system, this is totally normal. When you disconnect the battery and reconnect it, the system resets and automatically "panics" because it saw the power failure. If it's the factory system, simply have the key fob handy to turn it off after you connect the battery. If you don't have a remote fob, just put the key in the driver's door and unlock it. This will override and shut off the system.
442 views
Usually answered in minutes!
×