Noticed this about a year ago, but I've been too busy to actually look into it. I bought my '03 Blazer two years ago, and it came with an alarm system (at least that's what I'm assuming). The question I'm having is when I lock it with the keypad, but unlock with my key and turn the truck on, all the lights inside the truck will flash, but nothing else happens. I've driven five miles with this going on before I pulled over to figure out what was up.

So I was wondering if anyone know about a factory default alarm GM put into the vehicles, and if the alarm is just not functioning correctly, or if there is some kind of purpose to the flashing lights. Any help is appreciated. Thanks!