when i put my aftermarket stereo in i rewired every speaker in my 92 G60. the way my heidelberg unit was designed, the door speakers had an amp attached that powered every other speaker...so instead of messing with bypassing that, it might be worth your while to do what i did and just run new speaker wire to each individual speaker and replace your door speakers with some nice 5" speakers. It took me and a friend about 4 hours to do in all. Good luck.
i got my g60 without a stereo, wiring harness cut, and with the dash and rear speakers re-wired... used a 9v battery to see what wires went to what speakers, wire tester for the constant and ignition one, and rewired the door speakers.
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