my 03 silverado has automatic headlights. the other day i was driving and noticed my headlights were on and it was sunny outside. i could manually shut off the headlights but my dash was still lit up. when i turn the truck off everything seems to shut down normally. the sensor isnt covered by any items. it only actually happened once so far. i looked around and i see they sell a relay for this system. but i cant find the actual light sensor. does anyone know the proper name of this sensor (the dark gray dome thing) so i can find a new one. also, can anyone describe how to test the sensor and the relay so i know what to buy. also is it easy to change out that sensor? it seems like it should pop out or unscrew. (i hope) thanks for reading, also any other advice on whatever im missing would also be appreciated.