The headlamp washers operate on every 10th operation ( I think ) of the screen washers, apparently it's a regulation, in europe at least, that vehicle's fitted with HID lamp's have washer jets fitted, and yes there're operated from the column stalk.
I've not come across any Euro specific manuals or TSB's etc. online as yet despite looking ! However, if you look on the UK version of the website that start's with an 'E' and end's with 'Bay'
you'll find service manuals (on CD) for sale quite cheap, obviously I doubt there're fully licensed copies, but apparently they work. I've just had a quick look on there but couldn't see any, however they do appear now and again.