Tail gate won't lift - Mercedes Gl-class Gl450 Gl550 Gl320 Exterior Stainless Steel Chrome Pillar Posts Trim Set 2007 2008 2009

This sounds like a signal/switch issue. Check the tail lift switch. It may be a button built into either the tailgate or the frame it sits in. It'll will probably be a spring loaded button that is pushed in when the lift gate is closed.
Also check the wire harness that feeds from the body to the lift gate. These flex every time you open and close the lift gate so the wires inside can wear out or snap over time.

thats dangerous for the one holding the handle. there is a rod from each side that runs to the handle. one is probobly out of adjustment. If you can see them under the handle when you lift it up take a screw driver and pry it towards the handle. if it opens then its out of adjustment

Is it electric ? If so check related fuses

you can remove those bars to shut the gate BUT when you do theres nothing to hold gate from dropping all the way down to bumper. hope this helps!!!!

If it is for the turn signal bulb for the tail light, here ya go:

Tail Lights

1. Open the lift gate.
   
2. Remove the screws from the tail lamp and pull the tail lamp from the body.
   
3. Disconnect the electrical connector from the tail lamp.
   

To install:

1. Connect the electrical connectors.
   
2. Install the tail lamp and tail lamp mounting screws.
   
3. Close the lift gate.
   

Tail lamp detail view

The hose runs along the frame and up through the tail gate on the two piece tail gate, on the single lift gate the hose runs from the top where the hinge's is located that hold the lift gate. Common for the host to crack there, causing it to leak before it goes out to the wipers. Good luck and hope this helps.

You should be able to remove the trimpanel on the lift-gate. then at the location of the striker in the middle-bottom of lift-gate you should be able to access a rod. Grab the rod with pliers, if pliers won,t fit the rod connects to a metal lever attached to the striker assembly, pry the lever away from the striker and this should release you gate....Good Luck!!!

pretty easy to do find the ends of the lift support should have a clip on the back side of where it connects pull clip out and remove shock.

replace the lift gate/door ajar switches, they are located inside the tail gate on the left and right latch assemblies.