Instrument panel lights only turn on when truck unlocked. . .

I'm having this really weird issue with my instrument panel and climate control lights. I have an after-market alarm, that I'm pretty sure was installed when the truck was new. When I unlock the truck with the fob, all the lights turn on--instrument panel, climate control, dome, headlights, everything. Then when I get in and turn the key, the instrument panel and climate control lights switch off, even though I have the headlights turned on. If I lock and unlock the truck using the key instead of the fob, the lights don't come on at all.

This all started after I swapped out my headlight and corner light housings. But I didn't touch the wiring at all, I just unplugged the bulbs and then plugged them back in. The only other thing I've done that could be remotely related is change the bulbs for the climate control lights. But that was a few weeks ago and they worked fine until I installed the new headlight/corner light housings.

Any ideas?? Obviously not a fuse, right, since the lights do come on? I checked the fuses anyway and they're all fine. I'm at a loss. I really appreciate any help.