How to change DRL on 2009 tahoe - 2008 Chevrolet Tahoe

SOURCE: REPLACE TAHOE DRL BULB SOCKET

You'll have to order the socket from the GM dealer. I've tried some common park/tail light sockets from Napa, etc. and none fit the lens housing. Part# for my 2004 GMC Sierra is 15306157. (Yours may be different, but probably not)
Remove the headlight lens (unclip & flip the two black steel rods towards you and pull them straight up & out). The lens should almost fall out if the bulb wires didn't hold it in!
There are only two wires, and since incandescent bulbs are not polarity-sensitive, they can go either way without mixing them up. Just cut & strip the old socket's wires, and strip & crimp the new socket on. ****-type crimp connectors were even included with the socket.

SOURCE: How do you replace the passenger DRL on a 2006 Chevrolet Tahoe?

if you remove the headlight, it has two pins that slide down one on each side unhook the wiring for the bulbs. next you will see the top of the parking light on the side closest to the middle the parking lens has a built in clip if u press it in with your finger and pull out the whole lens will be accessible and you will be able to change the burnt bulb