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What happens if you set the switch to manual parking light? (one click left of all the way right.) Is it just the DRLs, or do you get anything happening in the headlight area?
 

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Those should come on with the headlights unless there is an exception when running DRLs. This is somewhere buried in the FMVSS (Federal Motor Vehicle Safety Standards) act.
As I understand it, the purpose if that was to mark the car's corner in the event a headlight was burned out. That way oncoming cars could distinguish between a motorcycle and a car with a burned out headlight - and where it was. Before that, when you saw a single headlight in the middle of the road, you hoped it was a motorcycle!

The DRLs would seem to serve the same purpose.

At this point, I'm suspecting that for 2015, the BCM didn't sprout a new wire, but the 2011-2014 parking lights were routed to the 2015 LED DRL. The change would only be in the wiring harness for the front clip and a few lines of code.
 
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