read the FAQ for rear-seat removal if you are not pre-wired. There might be an easier way, but this is how I did it.

http://www.brickboard.com/FAQ/700-900/RadioAntenna.htm#SpeakerRemoval

Remove Rear Seat Bottom Cushion--About 6 inches in from either side, on the leading edge are latches that hold by way foam compression. With the palm of your hand, PUSH IN...Then DOWN, Then lift up and away, both sides.
Remove Rear Center Headrest--Extend upwards...lift and unsnap lower section of plastic cover. Then remove 2 phillips trim screws on upper part of plastic cover..really have to pull up on the headrest as you do this..set plastic cover aside...Remove 3 bolts w/10mm heads...withdraw center headrest.
Remove Seat Backs--Find metal tabs at right and left lower corners, bend upwards and pull lower part of seat backs outward. Lower the center armrest to about 45 degrees. Push up on seat back until upper corner tabs/slots come free, pull entire seat back ass'y forward over and away from center armest. CAUTION.. feed 3 seatbelt straps carefully over seat back as you withdraw it from car.
Remove 2 Remaining Headrests--Take out 2 bolts w/ 10mm heads, each side, remove reinforcement plates, withdraw headrests and set aside. Remove 3, T-25 screws that secure Rear Deck Panel.
Remove Deck Panel--CAUTION Feed 3 seatbelt straps sideways and out of the plastic grommets. The right and left grommet/'wing' extensions are VERY weak and will break. Be careful when withdrawing Rear Deck Panel from car.
Remove Insulating Pad--Just lift it up and away.