Pull the bottom part of your set up and outward on both sides,
remove the headrests, under the velcro flap theres a 10mm nut remove it
from both sides, then remove the seat belt bolts on the bottom where the bottom seat piece was removed, then remove the two 10mm bolts on the bottom holding the back panel seat in place, now remove the little screws from the shoulder straps seatbelts, ontop of the backseat rest. now remove the three black plastic push rivets with a flat head scewdriver (on the back panel). now pull the molding outward where the end of the window is it looks like this ---> ( pull that molding out just enough to remove the right side back piece against the left and right side,
those two pieces are holding the back panel in, so remove those pull a little hard,
then the back panel pulls out real easy. then remove sub and replace.
then follow the steps backwards to put back.