Rear door hatch won't open automatically
Check the hook and latch for any obstructions or sticking. Also check remote button for semi sticking.
SOURCE: My GMC 2005 Yukon XL
Here is a link on how to fit your rear hatch issues.
http://gmcowners.com/gmc-forum/showthread.php?t=12619
Thank you for using fixya.
SOURCE: 2005 gmc yukon back passenger doors will not
My wife's 2003 Yukon wouldn't lock the rear doors or hatch, but it would unlock. My problem was the lock relay was bad. There are two relays, one for lock and one for unlock. They are located in the fuse panel on the left side of the console. Open the drivers door and you will see a cover that pops off. Behind this are several fuses and relays. Consult your manual to see which is the lock and unlock relays. They are side by side on a 2003. They pull straight out. I replaced both and they were around $10 apiece at any auto store.
SOURCE: rear hatch will notopen
Rear Hatch Release/Lock Failure: How To Open The Glass
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your Blazer or Jimmy will eventually burn out. when it does, there is really no way to open
the glass and lower the tailgate. The dash push button won't work, the rear key lock will
not work, the inside tailgat handle will not work, and you can not remove the interior
tailgate panel to access the mechanism because the screws can only be reach when
the tailgate is down (awesome GM design feature). The only way to replace the burnt
out actuator is to open the tailgate which you can't because the actuator is burnt out.
I've read stories that even the dealers don't know what to do, some have even cut up the
back panel to reach the so-called manuel release. Others said they pulled back the glued
on carpet to search for it also.
Well if you don't want to hack up the tailgate panel or rip out your carpet,
here's the easy way to open the glass:
You just pull back the interior tailgate panel right above the bump in the middle
where the latch is. There are no screws or bolts in that area, you can safely pull it back
about 2 inches. Then you'll have to stuck your finger in and push down the release bar.
See the 2 pictures below:
http://img.photobucket.com/albums/v2...z/IM000658.jpg
http://img.photobucket.com/albums/v2...z/IM000664.jpg
(No pictures allowed in this forum 
, oh well, click the links then)
The first pic is of the latch, it's the gold section.
The second pic shows what you need to push downward.
When you get your finger back there, you should be able to feel for the part that need to
be pushed down. When that part is pushed down, the glass has been unlocked.
Now that the glass is unlocked, it and the tailgate can be opened. Now you can remove the
interior tailgate panel, it has one screw on each side and easily lifts off.
The actuator that needs to be replaced costs $58 from the dealer, so if you don't want
to replace it yet, but still want to open the back, you can leave the panel off and just puch the
manuel release level. Here's the pic of the tailgate:
http://img.photobucket.com/albums/v2...z/IM000669.jpg
It's in the open section right below the latch, hows my fingure pushing it:
http://img.photobucket.com/albums/v2...z/IM000668.jpg
I haven't replaced my actuator yet, still trying to find it for cheaper than the dealer wants,
but hardly any part store guys know what the hell an actuator is
SOURCE: 2006 GMC Yukon Denali XL Rear Hatch & Glass locks not working
Could be the latch mechanism for the door is sticking. You could try using some white grease on the latch and the contact where the latch hooks to. You can purchase the grease from most auto parts stores. You will not need to use alot. Just apply a small amount to the mechanisim and then work it in using the manual handle. Then open and close the door several times to feel the "action". Then apply a little more and repeat. This should loosen the latch and get it working again. Also make sure that none of the tension springs have come loose on the latch. And check the seal around the door and make sure it is not pinched and has a proper fit.
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