Could be the starter solenoid is going south or also an ignition could be a culprit. try to duplicate the condition and gently tap the side of the starter with a hammer while someone else holds the key over in the start position. be careful while doing this. if the starter turns when you tap it, the brushes inside the starter itself are gone and the starter needs replacing.
SOURCE: how to replace a crank sensor on a 93 buick regal 3.8L engine
Im assuming this is the Series I 3800? If so, if you can email me I can send you some directions on the process. Its for a Series II 3800 but it should be similar. If you cant email me, post up and I'll see what I can do.
SOURCE: pass key stays on1995 buick roadmaster car want crank
Short circuit probably not the problem. The pass key system is not being disabled making the car inoperable, thats why it will not crank. Either you are using a key that does not have the correct resistance(black chip in key) or if it is the same key you always used then the pass key sensor went bad. I believe it is in the steering column and a qualified mechanic could help you there.
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