wand106- You are correct. The problem is the diversity antenna amplifier module located behind a trim panel at the top of the rear windscreen. This has been described in another thread. Apparently it is not uncommon for cracks to develop in the rubber that coats the electronics. The cracks are due to shrinkage of the rubber (with heat+time), and in doing so, breaks the connections between the PCB and some surface-mount components. At least this is what I observed in my unit. Its seems impossible to fix (and I am very skilled at electronics repair and fabrication) because if I try to peel back more of the rubber to get to the broken components, it ruins more components.
The module connects to 3 coax cables. One supplies power and command data from the radio, the other two are antenna outputs -- the radio selects which has the better signal.
Very difficult to find a replacement unit. Very expensive new from dealer.
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