A little off topic...
On my Ford Expedition, relays also need to be in place and working for some pins to have power. It took me three trips to the dealer to convince them that Ford did not supply my truck with the relay needed to power the backup pin. Most users probably never use it so they left it out of the standard towing package. I finally got a service technician with more curiosity than opinion to pull out the electrical drawing and trace the problem. Sure enough, no relay in the socket.
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