If I'm not mistakin I think there is an aftermarket harness that goes in there from stereo shop that can correct that problem. Those guys know best on the tricks to get around that. Got any buddies at the local stereo joint?
There is a specific harness for this application but your problem is you don't want door chimes to work. If I'm correct so far I would let the stereo boys take a stab at it so's not to mess stuff up much more. Cuz there is some cross circuitry.
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