There are two pumps in the car, the one under the passenger rear seat handles lock/unlock, lumbars, backup assist, trunk handle, provides vacuum for HVAC when car is not running, lumbars, and rear headrest with the non electric rear seat. It is a failed pump $spensive, a leak in the system it shuts off in 10 seconds on the locking function and it shuts off in 60 seconds on lumbar and climate control leaks.
If the doors and trunk dont pull down it is the other pump over the drivers side rear wheel also $spensive.
There is a release uner the trunk lid that allows the latch to be retracted manually it is in the owners manual.
I think there was a bulletin about a defective hose in the pump but I seem to recall it was for a later model. I would pull the fuse wait and reeinstall it to see if you can hear the pump run, there is also a tool called MIGHTYVAC which can be used to draw a vacuum in the various circuits (hoses) to see if they hold.
The close assist also has a safety, two attemts and it will disable the circuit.