You're more than likely unlocking the door with the key rather than the key fob which is setting the alarm off. I had a 2000 Eclipse with a factory alarm that did the same thing. There's 3 key fob options for the 2003 year. If you have the last 8 characters of your VIN (it will be 3E and then 6 numbers) I can tell you which fob you need and the list price. They're extremely easy to program as well.Hi Everyone i have a 2003 GTS Hatchback 2 Door Eclipse having issues everytime I open my door lights flash non stop. However if i get in my car and shut the door the lights flash for a good 3 mins and then finally go solid. But when i get out of my car and keep the door open the they continually flash i cant seem to figure out for the life of me why its doing this any ideas at all?