yea.. from playing around with a couple cars with airbag systems.. they were all independant, and wired very carefully so such an accident wasn't possible.

however.. i have seen factory alarm systems wired into the head unit.. this is common in honda civic's (and probably other models) its' well known, and if you check cruchfield, they make an adapter cable to power the head unit, tucked somewhere inside the dashboard so you can change out the deck..

from my talk with a couple installers.. if cruchfield doesn't make such an adapter cable.. there probably isn't anything wired funny. they are very quick to come out with this kind of hack cable to fix head unit replacement problems.

12gig red mk2 -- 080000125