Having Just Bought A 2011, 159 TI Sportswagon, Really Love It,But Can't Clean The Rear Window As No Action From The Wiper. Have Tested it Using A Battery & Motor Is Working Fine, So Spindle Not Rusted Up. Water Power Jet Is Also Fine from Controls On Steering Column. But Steering Column Controls Don't Work The Rear Wiper?? Is There A broken Connection?? If so where should i Start looking?? Or is it more likely that there's a Fault On the Steering Column Controls. Any help/Ideas Would be much appreciated.