gmlover

I have a 2000 convertible. When I use the key to get in; The alarm sounds. I disarm it by turning the ignition on. While the engine is running I can't roll the window down, I can't lock the door, I can't use the mirrors either. The only way I can get these accessories to work is to tap on the door near the speaker. I haveto continue doing this untill I see the locklever move to the lock position. One time I had to do this for about 15 minutes.[>:]Please tell me what it could possibly be? Spring is approaching. I won't drive it till I get this fixed. Thanks for your help.