How to remove the lift gate panel on 2010 Acadia?

check fuses and relays ----possible frozen rusted or damaged lock --crawl into back remove plug on the door panel and insert a long screw driver to release the latch manually then remove panel to service latch

You need to replace the rear latch assembly it sounds like the switch inside latch is going bad.

lift gate glass adjar ??? Ajar switch . First off you need to remove the interior trim panel . Sensor inside the lift gate . Video's on you tube .

Has to have it .
Liftgate Trim Panel Plug
Procedure
From inside the vehicle lower the second and third, if applicable, row seats.
Use a small flat-bladed tool to remove the access plug from the liftgate lower interior trim panel.
Push on a silver lever located on the right just through the access hole to unlock the liftgate.
Open the liftgate from the outside of the vehicle using the exterior handle.

Outlook Traverse Acadia Enclave Lift Gate Won Open

How do you know it need's a switch ?
Rear Hatch/Gate Description and Operation
The lift gate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the lift gate actuator through the body control module (BCM). The BCM will pulse the lift gate actuator when a release input is received through the key fob, or the instrument panel switch. Did you test voltages ? Check for BCM DTC'S - diagnostic trouble codes ?
Circuit/System Description
The lift gate switch is an input to the body control module (BCM). The BCM supplies battery voltage to the signal circuit and when the lift gate switch is activated the signal circuit voltage goes low. The BCM controls the lift gate release actuator assembly through the LIFTGATE relay. When the lift gate switch signal is activated, the BCM enables the LIFTGATE relay by applying battery voltage to the lift gate relay circuit and the relay is energized when the BCM grounds the LIFTGATE relay control circuit. When the relay is energized battery voltage is supplied to the lift gate release actuator assembly through the lift gate release actuator control circuit.

Is the arms bent

grand cherokee.
if outside USA names change. so...
2010 GC. USA,
dome lights stuck on, caused by, door switches stuck on.
cause:

1. switch bad
2. adjusted wrong
3. jammed up.
4. wires shorted to the switch.

Will require a scan tool to check for codes, make sure latch is working well, make sure release switch is getting signal. Most common concern is the latch itself though

go inside to the lift gate and try to use a scewdriver to pry the latch loose while someone pushes the button or turns the key. it sounds like it's in a bind. you also may have to remove the cover panel from lift gate from the inside.

Remove the trim from inside the vehicle and release the latch rod manually. Once it is open you can further diagnose the problem. It may just need to be lubed from the inside.