they were a problem on these as the wires below the seat get caught/broken. If you put your hand up beneath the seat you will find a hole in the foam and up inside there is the thermostat where I will guarnatee the wire is broken off. You should find a loose wire under the seat somewhere and tha is ...

Thanks Matthew1, that has sorted out my problem. It does look like it will work with my head unit. Now I must buy one ond fit it.

The nearside (UK market) headlamp wiper on my 1997 850T5 has stopped working and it looks like the motor. Can these things be taken apart and repaired or must I buy a new one? Would one of the 7 or 9 series ones fit? Looked on E-bay but they seem to be holding high prices!