I don't know if the PO bypassed the fader switch or not- he had speaker boxes in the back seat wired into the rear deck units; I disconnected and removed the boxes. Is there a way to jumper the fader switch socket to see if it is connected and working? I'm thinking maybe my fader switch went bad. Otherwise, I guess I have to either trace the wires through the back seat for breaks or pop the head unit (for which I don't have the removal tool-it is a blaupunkt san diego, connected to a cm5 changer mounted in the trunk). Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)