There are not fuses in speaker circuits.
The manuals don't reall say, but I'd think you would need to have rear speaker--in the storage shelf--before the fader would be effective. The radio has rear speaker connectors, but something has to be connected to them.
First though would be damage to wiring in door--lots of flexing there.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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