My 04 Doblo has a tailgate and the rear wiper does work but there is no time delay wipe option, just wash/wipe or on permanently. Anyone know whether it's possible to modify it to wipe every 10 seconds or so?

A simple timer can be made using a 555 timer, Plus , a relay, a couple of capacitors and a couple of resistors. Fix it in a plastic box , Shouldn't cost more than a couple of pounds. If you can't find an electronics hobbyist , e mail me with a postal address and I'll send you a diagram. Could possibly make one ,out of my scrap box if you can't find anyone near you. You might even get one already made from somewhere like Maplins.

Thanks very much for the info will check out Maplins etc.