Hmm, looked under the seat today and found what looks to be a relay type thing. Took the bugger apart too, and just for good measure will douse it all in contact cleaner spray tomorrow.
I did notice that both drivers and passengers side were both unclipped from the bracket, maybe a sign that someone's had them out before? Had the car aaaaages though, so maybe not.
I can't help but feel it might be the dash- based controls though, since they're both doing it.
