'03 YUKON...Third Brake Light quit working

hello..new here! recently my third brake light just quit working - no light at all. no soft glow, not some LEDs out and some working; just completely quit. Any ideas from anyone? I find it hard to believe it would have failed all at once. Where are the connectors/plugs for this located that i should check? other ideas?

Thanks!
Mark

...any ideas anyone?

did you try to pull the light off and test the lead connector for power? Just to make sure there isnt a break in the line. Check the fuse box ? any blown fuses?

fuse panel located at the end of the dash drivers side for starters.. also the fuse box under the hood drivers side.

greengumby said:

did you try to pull the light off and test the lead connector for power? Just to make sure there isnt a break in the line. Check the fuse box ? any blown fuses?

fuse panel located at the end of the dash drivers side for starters.. also the fuse box under the hood drivers side.

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Well I have looked at the fuse boxes...both locations...but couldn't find on the directory any that specifically said it was the third brake light (or whatever GM calls it specifically). I found some for brake/stop lights BUT logic would tell me that if the lower brake lights are working then it wouldn't be that. I wondered if that particular brake light was on a different circuit than the lower brake lights (i.e. different fuse).

Do you know of anywhere I can look on the web for directions on how to remove the light? My dad and I looked at it earlier tonight, actually, and couldn't see how to get it off. He's very vehicle savvy and said he wouldn't tell, but then again it's a tight squeeze (lift gate rear end) and hard to see with the glass opened. Maybe we just overlooked it.

Help!

i found a site with the actual part

http://www.txparts.com/servlet/the-780/3rd-High-mounted-stop/Detail

this will give you an idea on whats involved it looks like it comes apart from the inside of the truck look to see if there is a trim panel or something from the inside


i'l take a look at mine tomorrow when there is more day light and the temperature is alot better

greengumby said:

i found a site with the actual part

http://www.txparts.com/servlet/the-780/3rd-High-mounted-stop/Detail

this will give you an idea on whats involved it looks like it comes apart from the inside of the truck look to see if there is a trim panel or something from the inside


i'l take a look at mine tomorrow when there is more day light and the temperature is alot better

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oh okay, awesome. well i feel kinda stupid now but i realized i didn't look at it by opening the entire lift gate so that may give access to it. i'll look tomorrow or this weekend and see. i just can't figure the entire unit failing. it seems my experience (just in noticing it on other vehicles) is that bulbs/sections stop working but not the entire unit (i've noticed this on Escalades, for one, and on other vehicles w/ led 3rd brake units). That makes it seem like it came unplugged or something like that. Good idea to check the cable for power with a meter; I'll do that this weekend for sure. Any other tips, please let me know. I'd like to get that light working again. Thanks for your help thus far!

there are 2 screws at the base of the light you must lift the gate filly not just the glass to get at them ..on mine i got this stupid plastic black cover trim gotta remove that first then you will see the two screws... looking at the link i sent you can see the screw holes so u can use that as a reference on where to look for the screws

greengumby said:

there are 2 screws at the base of the light you must lift the gate filly not just the glass to get at them ..on mine i got this stupid plastic black cover trim gotta remove that first then you will see the two screws... looking at the link i sent you can see the screw holes so u can use that as a reference on where to look for the screws

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hey...yeah, i did some checking on it this evening and got the thing removed. i have power to the unit but when i hooked the unit up directly to a vehicle battery for the purpose of testing it i couldn't get it to light so I have ordered another unit...$127 but I guess it's all I can do. The local dealer wanted $166. Thanks for your input and help...hopefully this solves the problem. if not, i'll post back and update.

mark72501 said:

hey...yeah, i did some checking on it this evening and got the thing removed. i have power to the unit but when i hooked the unit up directly to a vehicle battery for the purpose of testing it i couldn't get it to light so I have ordered another unit...$127 but I guess it's all I can do. The local dealer wanted $166. Thanks for your input and help...hopefully this solves the problem. if not, i'll post back and update.

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The new light came with the light itself, the rubber seal that goes around it, and also the short cable. So, I replaced all 3. At first it was still giving me fits (almost like a short somewhere) but after awhile it seems to be working fine every time now. So, that problem is solved! :clapping:
Thanks for the input, guys! :thumbsup: