On our 2012 Solers "S" I believe there is an aftermarket circuit board "hidden" behind a panel in the utilities bin. I understand the vehicle rear turn, tale, stop lights; the clearance lights; and, I believe, the trailer plug connections come from that aftermarket (non-Mercedes) board. If you search the Solera forum for something like "no tail lights" I think you will find information.
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JLeising
2012 Solera "S"
Calif SF Bay Area
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