Should my car buzz or make some other kind of annoying sound if the keys are in and the door is open, because mine doesn't and I leave my keys in all the time. I've already locked them in my car a couple times becuase I was used to having a buzzer in my truck. Thanks.

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90 Formula 305 TPI 5 speed
K&N, Dynomax Muffler

 

Yes, the buzzer should go off.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

If it never buzzes at all, then someone probably removed the "buzzer" which is a small box near the fuze box and the plug in for the trouble codes. If there is no box you'll have to get a new one and take it from there.