resurrected....
I am having a problem with my factory head unit/dome light/keyless entry as well.  I posted in "my car is broken."
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  I just now put it all together though, I didn't realize that these systems were all interrelated.  I have a cd changer which likes to skip for long periods, and my dome light rarely ever (once in 2 years) works, also, my keyless usually works, but occasionally I have to hit it more than once.  Could my head unit be the culprit?