Jeep 2007 Liberty - Manual (Page 151)

There is a rear power outlet located in the right rear cargo
area above the storage cargo net/CD changer (if
equipped). The rear power outlet is a direct feed from the battery so
it receives power whether the ignition is in the ON or
OFF position.
All accessories connected to this outlet should be re-
moved or turned off when the vehicle is not in use.
Rear Power Outlet
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 151
3