As I now have this problem on Sports seats I've started to have a look underneath. 
If it is indeed the front (moveable) section that has its own small pad and that usually is the one that fails I thought I'd start there as it's more accessible.
Looking under the seat there is a thin cable sleeve connecting the front section to the rear, held on by a cable tie.
I can't think it's there for anything other than the detector; I'm sure there's no heater in that section.
As it's much more accessible than the main plug and wiring I'm going to start there, cutting the sleeve open first to see what's inside.
If there is a main and secondary pad I can only assume they're wired in series. Can anyone confirm that?
If that is the case it might even be possible to bypass the front pad with an intermediate resistance value so that the main pad operates the system normally.
Edit: Just opened the sleeve - one blue wire, one white wire.
I'll be cutting through that and measuring the resistance of the disconnected front pad shortly...... 
Might it even be worth shorting them together, simplest solution of all? 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 13th July 2012 at 02:08 PM.
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