OMG well that is better than what I was thinking. BCM. after looking at the upfitter wiring (again) it shows the two light assemblies have a ground of their own, so I thought oh crap, his BCM fried, its not the ground.
I personally cannot explain how they could all die at once. Short of a power spike (not likely) it shouldn't happen. Are you sure they all went at once?
I've been playing with LEDs for a few years (in my house, not the car)and that BS about them lasting forever is just that, BS. I guess technically the LED might last a very long time but maybe the rest of the circuit that makes them work doesn't? They are getting much better fast though.....Just about every bulb in my house is LED now. I've been having good luck with the newer ones and the price is finally fair.
Anyway thanks for the update, glad you got it sorted out. I always like to hear what the problem was and hopefully learn from it.
Did they remove your resisters and put new bulbs in it? I just ordered some Jstar something or another LEDs for backups. They said can bus friendly and are supposed to be very bright, we shall see. I don't really want to cut into my wiring for resistors to do any LEDs so I'm staying away from that. If you didn't need resistors I would run them for sure. I like to idea of low current draw and low heat but that resistor negates that :(
The reason why I know they failed pretty much at the same time is becuase I drove to work and back on Friday and everything was working, the truck sat there until Monday morning and when I remote started it I noticed that the tail lights did not flash when I hit the lock button, so something happened between Friday night and Monday morning while the truck was sitting there.
The dealer tried one bulb without even removing the resistor and it was working (the resisitor is only needed for the blinker), then I disconnected all the resistors when I went home and put back all the original bulbs, now everthing is fine.
The LEDs lasted 16 months of normal use (1 year warranty did not help). The only one left to fix is the 3rd light and I'll do that sometime this weekend when the rain and snow stop.
Honestly I have lost faith in the LEDs, at least in the JDM brand, even one of the switch-back types that I have in the front is half working.
The LEDs in my last Nissan Frontier lasted 6 years and they were all working when I sold the truck. The only difference was that they were all separate bulbs for Stop and turn Signals, may be these dual pupose versions are not as robust.
All the LEDs that I have used in the past required resistors when used with turn signals. Maybe future BCMs will be smart enough to not require resistors and can detect the small current draws of LEDs.