Your Sender is bad if your gauges sweep fine from left to right when you turn the ignition on. otherwise its the cluster. (mine sender is bad at this very moment, gauge reads 120, theres only 1 unlike some cars that have one for the pcm and cluster, not ours, we get 1 yay, its like $60 bucks for an AcDelco
I assume you checked your rear window to ensure its hooked up? do you hear a relay click (i forget where, i could go check) when you push the defog button? maybe the lights dim slightly?
Grand am'* have a completely different setup (Theftlock II, it will relearn with a 10Min reset ignition on the chip is in the Haloflex/theftlock sensor inside the ignition cly.) our Bonnevilles 00+ are PK3 Im not quite sure why your light would come on unless you have a problem with your transponder (around the key cly. it snaps on to the cly. you can see it with the dash trim removed.) I get the security light maybe once a week/or two. turning the ignition off and back on usually solves the light doesn't bother me enough to pursue it.
odds are both your wipe motor and window regulator/motor are on the way out, usually cold weather makes it really noticeable. they're time is limited.
Last edited by RPerry435; 01-18-2010 at 08:49 PM.