Step 1 - Use a large flatblade screwdriver to ease the cover up (place hand over the top in case it flicks up and hits the windscreen)
Step 2 - Raise the head rests to expose a plastic trim cover which you can pop out with a small flatblade screwdriver
Step 3 - Use a racthet with an extension to remove the 12mm nut, note that the end of the threaded bar is not threaded which lets the nut sit on the end instead of falling down behind the seat to a magnetic parts tool will help you recover it
Repeat this for both sides
Step 4 - Pull the centre console trim forward (two clips hold this in place)
Step 5 - Remove the 12mm nut holding the rear seat bar in place
Step 6 - Depress the flexi strip on the side of the seat and unplug the 3 pin connector for the seat base (I found it easier to work both hand in this gap and do it that way)
Repeat on both sides
Step 7 - Pull sharply up on the seat base and unhook the 4 retainers (two on each side, one set shown in the second picture) and remove the seat bases.
Step 8 - Remove the two 12mm nuts holding the bottom of the seat back in place
Step 9 - Insert a large flatblade screwdriver into the seat belt guide and twist it, this takes some force to unclip, then slide out the belts
Step 10 - Disconnect the 3 connectors under the seat base (just press and pull affairs). Then remove the variosus restraints with a pair of snips/pliers
Step 11 - Disconnect the main wiring connector which sits in front of the wheel arch (again just press and pull)
Step 12 - Remove the seat back from the car. Note Unhook the elastic around the seat belt clasp on the way out
Step 13 - Remove the two 12mm nuts on the nearside seat back also
Step 14 - At this point I just folded the seat back down, I had plenty of room and didn't need to do the wiring disconnection on the nearside but it's up to you
Step 15 - Use a couple of flatblade screwdrivers to pop the fasteners out (some call them 'christmas trees'). Put a screwdriver either side and lever it up, can be a bit tricky until you have done one or two
Step 16 - Press and pull to disconnect the wiring
Step 17 - You can now lift up and slide the parcel shelf down the seat belts as shown
Step 18 - Remove the 4 10mm bolts holding the sub in place
Step 19 - Disconnect the speaker wiring (press and pull)
Step 20 - Remove that sub, it simply lifts out
Step 21 - Refitting is easy enough, look through the rear screen while wriggling the parcel shelf back into place
Step 22 - Plug connector back in
Step 23 - Push the black plastic retainers back down
Step 24 - Reconnect the connectors and main wiring to the seat back
Step 25 - Hook the bottom of the seat back over the threads as shown
Step 26 - Hook the bar at the top of the seat over the threads (this bar moves to make fitment easy)
Step 27 - Fasten your two 12mm nuts at the bottom in place
Step 28 - Pop your elasticated cover over the seat belt fastener
Step 29 - Refit seat belts and clip them down (just press with your hand)
Step 30 - Re-route the wiring from the back across the seat base area. Use cable ties or the old connectors to route the wiring loom properly under the seat
Step 31 - Hook the nearside seat in place, shown is the moving bar which is hooked over the threads
Step 32 - Fit the 12mm nut that joins the seat backs
Step 33 - Refit the trim in place
Step 34 - Fasten the 12mm nuts to hold the bottom of the seat backs in place
Step 35 - Pull the seat belts clear then slide the seat base in. Rejoin the connectors as you go. Once you have wriggled it right back, press down at the front (checking the latches are lined up first of course)
http://img.photobucket.com/albums/v312/JSeaman/Lexus/LSTRStep35d.jpg
Step 36 - Refit the hidden nuts behind the headrests and their covers
http://img.photobucket.com/albums/v312/JSeaman/Lexus/LSTRStep36a.jpg
http://img.photobucket.com/albums/v312/JSeaman/Lexus/LSTRStep36b.jpg
Step 37 - Check everything still works!
http://img.photobucket.com/albums/v312/JSeaman/Lexus/LSTRStep37.jpg
Step 38 - Click down the speaker cover, this simply pushes down at each corner
http://img.photobucket.com/albums/v312/JSeaman/Lexus/LSTRStep38.jpg