As far as I can tell, there is no discrete output from the BCM indicating speed >16mph. But the door lock system would make Rube Goldberg proud and I may have missed something.
There is an "Unlock Sensor" (switch) in the driver's side door lock assembly that sinks BCM terminal 119 to ground. This could be used as an indirect indicator of vehicle speed greater than 16 mph (doors are supposed to auto-lock at that speed). It has the added advantage of the user being able to toggle it's state using the door lock switch.
YMMV
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