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I don't quite understand. The gate won't open with the power button or you physically cannot open the gate by pushing the latch? If you can't open it from the power button then you'll have to start checking your fuses. Your owners manual that comes with the car has all the fuse locations in it. If it's not the fuse then you either have a bad wire or the motor to pop it open has gone bad. If you cannot open it manually by the latch, then I'd say your linkage inside the door is broken and you'd be better off taking it to the dealer or to a body shop to get it repaired, especially if you're not mechanically inclined.
Insert the key and turn the lock cylinder while lifting up on the lift gate. You have to get the gate open. Once open, The strike plate (where the locking mechanism hits) is bolted to the jamb. Loosen the bolts and slightly move it toward the rear of the vehicle. NOT TOO MUCH!
Tighten the bolts, and try it. Hope this helps.
POWER LIFT-GATE OPERATION - To open the optional power liftgate, push the
button on the instrument panel , press on your five-button key fob (if equipped),
or press and release the control located in the left rear quarter panel (Figure B). To unlatch the
liftgate glass, push the button ) under the center of the license plate lamp shield, or
press on your five-button key fob. Do not open the liftgate or the liftgate glass
in a garage or other enclosed area with a low ceiling. Keep clear of the liftgate when operating
the rear switch. To open the liftgate manually, pull the handle located on the liftgate to release
the liftgate from the vehicle. The power system will take over when you release the
handle. To close, make certain the rear window is closed, and then pull down the liftgate a few
inches to activate power closing. Closing the gate rapidly or more than a few inches may activate
the obstacle detection feature and stop the power system.------------
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This should help.Keep updated.Thanks.Helpmech.
The tailgate on my 2008 Chevy Uplander refused to open. The unlock fuse was fine. The handle pull worked fine. I could even hear the little motor that unlocks the tailgate whirr when I pushed the unlock button. But the gate would not release. Turns out the problem was the lock mechanism was jammed because it had dirt in it and not enough grease. From the inside, I pulled the lift gate panel out at the window so I could look down and see the lock mechanism at the bottom of the lift gate. I reached down and prodded it with my screwdriver until I noticed that parts of the mechanism weren't sliding back and forth like they should. I sprayed it with a silicone lubricant until the parts started working again. Finally, the lock unlatched and I could open the rear hatch. I could then remove the entire plastic panel and remove the lock mechanism. I found that the mechanism has lots of rubber and plastic parts which get chewed up and start to jam if not properly lubricated. I cleaned out the dirt with my silicone spray and thoroughly lubricated all the moving parts. The latch now lets go of the post very easily, and the lift gate no longer gets stuck.
2000 Chevy Blazer 4 door with pop up glass and drop down gate. I experienced this exact problem 4 years ago. The glass unlock actuator inside the drop down hatch has a small plastic piece connect to it. This piece pushes the glass unlock mechanism. In order to temporarily unlock, you must pull the carpeting piece down and located in the center is an access hole where your can depress the unlock mechanism from inside, until you find a replacement piece. I recommend the pick and pull lots where you can find a similar make and model blazer with the drop down gate. I was able to get the piece and actuator (just in case) for $5. You will have to disassemble the gate in order to replace the plastic piece which is easily removed from the actuator, but cannot be fixed with glue, even with crazy glue. Have a excellent day and pass it on!