I took about 60 pics but not one of the pads in place
that's despite setting one up with the dimensions and everything 
These are the kiddies. For low power the pads are run in series, high in parallel (think radiator fans). The wires measure 135cm from relay to the switch connector, 20cm from that to the switch, the pad feed is 30cm to the connectors and 50cm from the connectors to the pads. Power feed is 50 in a tube, earth 135, +ve 285cm.
I wasn't really sure where to put them but my first bit of luck was the feeds are there, just missing the switches and the OE pads, so I thought it would be rude not to use them. I think for you Teamy, and anyone else replacing pads, you could despense with the wiring and just use the original (although I'm not sure about Haynes' diagram of the switch, a resister and a diode??). I tried to hide all the wiring 'cos I hate sodding about with it and it invalidates the warranty if I mess with it (like I'd be able to send them back from here...) I bridged the wires on the switch plugs with fuses:
The first job is to disconnect the airbag ecu. It's under the center console so this comes out. Don't forget to disconnect the battery and leave it for a while first! (unless you have a thing for balloons
)Getting the seats out.
The first thing is to take the trim off the outside of the seat, you need to do this to get to one of the bolts and take off the seatbelt. One screw (T-20) at the back, then the thing pulls upwards, starting from the front. Seatbelt (17mm), then do the back bolts first (T-40), then the fronts 'cos the runners are now tucked underneath and this makes it easier to get the thing out. Protect the sill trim with a mat or something, I made a right mess on one of mine!
I left the frame in place on the passenger side, I took it off on the driver's, then regretted it 'cos I had to fight a big spring to get it back. I think it's enough to remove the seatbelt pretensioner. The plug really does just pull off!:
Base
Note the connectors at the bottom: orange is the pretensioner, Brown is the seat heater dummy and black is the seat airbag dummy. You need to take off the two rubber bands holding the back trim down, they're hogringed onto the springs there.
A note on hog rings:
They're stiff little buggers
. The best way to deal with them seems to be to rotate them with point-nosed pliers until you find the overlap and then prize them open with a screwdriver (I used two: start with a small and then use a big once you get it in there), then rotate them until you can unhook them off the wire. Or, I have a nice pair of piano wire cutters, for when you just can't get to the buggers 
. To redo them squeeze them up with a pair of pliers, try not to leave any thing sticking out where it could damage the seat or your mrs's bum.The cover needs to be unclipped all the way around:
and the hog rings in the back corners need to be removed:
You ain't gonna be able to put them back so out with the piano wire cutters
And that's it, it's off.
To open it up you need to get undoing those hog rings:
There's also a wire half way down the base, I didn't see how I could get around it with the pad (without cutting down to something useless) so it had to go:
This is where the pad goes.
Btw the handle for raising and lowering the driver's seat is held on with a sprag washer, thus:
Backrest
The front's just clipped over the bar, the back's hogringed onto the bottom spring.
There's a plastic rail up each side holding the back and side materials. I was lucky because all 4 of mine were broken and I just slid them down & off. If it's not then it's a struggle to unclip the back material first, then the sides come easier.Lots of swearing and judicious use of a screwdriver.
Broken off rail.
Rail.
To replace you'll need a centre punch, a drill and some pop (blind) rivets.
My last bit of luck: you can get to the hog rings from the back. Be careful when you're prizing them open (do I have to point out where the screwdriver goes if you slip?), the ones on the wire in the middle you may as well cut as you won't be re-using them. When it's up cut the strip off the middle again and that's where your pad goes.
I ran the cables for the pads to the outside of the seat, avoiding anything that looked like it might eat them.
As Haynes say, reassembly is the reverse of the removal process. Those rails in the backrest are a pig, it seems easiest to put the sides in, then hold it open and cram the back in as far as it goes, maybe with careful use of a screwdriver. I put all the wiring down the side out of harms way, using plenty of cable ties (the ones that come with the kit are useless):
Passenger side.
Driver's side - I had to be a little more creative here 'cos of all the extra machinery underneath.
Looks ok though.
Where you put the switch is up to you, there's enough wire to put them on the centre console (if you fancy fiddling it under the carpet
) but I put mine on the seats:
And if you've read all this and still feel like doing it then you're probably as nuts as I am
I was joking you know 
