I've been plagued by the airbag light problem on the Spider for a couple of years now, and last year I cleaned the connectors carefully with proper contact cleaner thinking that would fix it. However when the other half rammed her sun visor under the seat last summer, the warning light came on again very quickly and the problem hadn't been fixed
Recntly I've had a good look at the connectors and the various options for a cure.
I'm not keen on soldering as seat removal is then prevented.
Alternative gold plated connectors would be good but there's a short circuiting bar on the seat connector that prevents stray charges firing off the explosive charge when the seat is out, and I'd like to retain that but there isn't anything out there with that feature.
I took a look at the female floor connector first. It's quite good, with a spring barrel inside the main terminal barrel. This makes it difficult to tinker with, and is probably best left alone apart from a blast with contact cleaner spray.
The male seat connector is, I think, the cause of the problem. It's poor quality, tin plated and has two simple tubular pins that have been compressed for their life and have shrunk.
lf you look at each pin there are four slits at the end and one of them continues down the pin as the side seam. What we need to do is open this seam up ever so slightly so as to make it fit more firmly into the corresponding female terminal. Use a thin blade like a scalpel, and twist it slightly to open up the seam. It will probably spring back at the first try, so use a slightly thicker blade next. What you need to see is the seam to stay open - only by a very small amount so don't go too wild at this stage as you may damage the pin. Think brain surgery and go carefully.
When that's done, clean the pins with tweezers, tissue and either a contact cleaner such as Electrolube or the Caig De-Oxit which is used in the audio industry and is difficult to get hold of in the UK. It's on the shelves of computer stores in the US at half the price, so if you're travelling there, buy some as it is excellent stuff.
When I refitted the seats and connectors, I found on mine that the seat connector lead (black) was ty-wrapped to the underneath of the seat, but the yellow floor one was waving free. There is enough spare length on mine to ty-wrap the yellow lead to the underneath of the seat as well and minimise the strain on the connector. Make sure the seat can travel it's full adjustment without causing any tightness of the leads though.
Hopefully only one more visit with Mr Laptop is needed and the airbag light will stay off indefinitely.