Check the fuse. If the rear wiper fuse is good then it could be a wiring problem. Check the wires to the rear hatch, then check the motor itself.
If its in a hatch back the harness between the hatch and the body often goes bad The switch and the fuse are common problems.
#13 spot on your fuse box on the downward dash side of driver side........20 amp
check fuse Im serious it happened to me
On my 2005 model it is the same as the cigarette lighter, which what it is called on the fuse block. The fuse block is located behind the pedals on the driver's side firewall.
More specific information is needed. There are several electrical items associated with the rear hatch, some of them on different circuits with different fuses. IF you are referring to the remote door unlock - ALL power door locks for the vehicle are on the same fuse/breaker. If it is only the rear hatch that doesn't work from the remote switch on the dash - check the switch first, then the servo motor inside the hatch door itself.
The rear hatch can be replaced by another hatch from an 82 to 92 firebird or camaro.
check the wiring behind the switch...they corrode
May be a BCM glitch or the rear trunk latch there is a recall from gm about the rear hatch latch
You can not open the rear hatch door from the inside.
what are the wires for on the rear hatch door hydraulic pumps
I'm sure there is a fuse somewhere, but the electrical connections for the rear defog are made thru the struts that hold the rear hatch open. this is why if you buy new struts for that car they will ask you does it have rear defog. the struts you need must have an electrical connecter at the forward end with a wire attached to each strut. go look.