Merceds c270 wipers

[Harman]

Need help as wipers and washers not working on 2003 c270. Changed switch and can work via diagnostic computer so why don't they work?

 

[whitenemesis]

Just bare in mind when testing via the switch, the wipers/washers will not function if you have either of the front doors open, might also apply if front windows open but not sure on that. IIRC testing via STAR over rides this