good afternoon my name is XXXXX XXXXX I will assist you today
One of the door witches is not working correctly giving the signal to turn off the lights. I have one and had the same issue. it was the drivers door switch, the door used the most.
The reason they go off after 15 minutes is the light control module does this to prevent the battery from going dead.
no, door locks will not effect this. the switches are on the door latch. mine was part of the door latch and I had to purchase the latch to get the switch. thats why I dont want to guess as it can get real expensive real quick
it would be cheaper to have a shop read the light control module for you and print it out than spend 1500-2000 for a scan tool.