Why Dome lights won't operate when the doors open, but can be manually operated?

do you have the dome light 3 position switch set to DOOR?one setting is ON,one setting is OFF,one setting is DOOR? if you are sure it's in the right position,then spray the door latches/switches.with wd-40,to un-stick the switches.open and close the doors several times after spraying to free up the switches.

I have an 2008 Silverado 1500 W/T that has dome light off switch located just above the dimmer switch. I had to search for it after my wife drove it and pushed it while attempting to brighten the dash lights.