99 suburban daylight running lights?

[gofishingtom]

just noticed in my garage that my daytime running headlites arent on..checked fuse and its fine looking for other things to look at..lites work when i turn them on

[Big Buck Buster]

Check the bulbs. If I remember correctly, they are located just below the headlamps. If you take the headlamp assemblies out, you can access the housings. Double check the bulb sockets, I have replaced many of them that were melted from getting hot.

BBB

[Jeremy airjer W]

If your in the garage they may not come one. You need to be outside on a sunny day with the vehicle in drive for them to come on.

[Macgyver55]

Not sure on the 99, but the newer ones go off when you are not in gear also!

[gofishingtom]

dont have to be in drive for them to come on...and i believe the daytime lights are the same bulb as the headlights and the headlights work when i turn them on..i read manual and check parking brake to make sure that was all the way off as if that is on even alittle lights wont come on..so im lost now

[Scott K]

Have you checked fuse 15 inside the truck? If so, go to the DRL relay and see if you have power to the yellow wire terminal G6, if so, jump the power to the tan wire, terminal H4, see if the DRL come on.

[Macgyver55]

Could also be the DRL module. On a '99 Chevrolet/GMC Yukon, Tahoe, the module is located on the dash bracket above the accelerator pedal. I believe it has a silver finned aluminum heat sink. If you get down under the steering column and look up above and underneath the panel, you should see it. This module uses a relay to power the DRL's, be sure to test that in addition to the fuse.