There are 2 clips that you should be able to easily feel along the edge of the seat (they are pretty much aligned with the front seats). Just push on them and the seat should pop off easily. There might be a seat-belt like thing that goes through the passenger side of the bench seat. You'll have to undo the bolt that's under the seat cushion in order to detach the bench seat fully
The rear seat does not come out. The middle seat is removable, after which you can slide the rear one up.
2000 sonata rear seat removal
Remove rear seat, them remove rear deck to get to the speakers.
Remove rear seat and remove battery
You need to remove the rear seat to access the speakers and remove the covers.
just pull on it!
Move seat back, remove bolts at the front of the chair slide rails. Then move the seat forward and remove the bolts at the rear of the seat slide rails. Disconnect control connections (Lumbar, heater etc)
The rear seat is not designed to be removed. You can remove the center seat and slide the rear seat forward.
first let the seat down, there are bolts on the side of the rear deck remove and deck lid should come up
You have to remove the bottom rear seat cushion by pulling up and out at the same time, then remove rear seat back by removing 2 bolts that hold it to frame. Rear shelf can be removed to gain access to speakers.
Remove the bolts fastening the rear seat cushion (Figure 7.52).Remove the rear seat cushion assembly.Remove the screws and remove the side rear seat back (Figure 7.53).Remove the lower bolts fastening the rear seat back.Tightening torque - 17-26 NmFlip forward the rear seat back, remove the bolts and remove the back seat.Tightening torque - 17-26 Nm
The rear seat isn't designed to be removed. If you have a center bench seat you can remove that by unclipping it, then slide the rear seat forward.