I just bought a 1992 Jeep Grand Jerokee Laredo from my Credit Union on a Repo. I was sitting in the car today with it turned off, for about 10 minutes. When I turned it back on, the security light started to flash and so did the lights. I was given no owner's manual, and the car is sold as is. I think I activated an alarm I didn't even know was installed. Do I have to take it to a dealer to get it to reset?