And here is how you replace the one way valve on the passenger side with a car fitted with Headlight Wash Wipe system. . . . . . . .
Pop open the bonnet, and remove the three trim clips holding the headlamp surround in place, along with the two self - tapper screws (lower down on the grill).
Remove headlight wiper blade element - pop the central cover up to expose the small nut. Remove this using the smallest spanner in your BMW tool kit. This will allow you to pull off the wiper blades. It may take some Wd40 and swearing to achieve this bit.
Carefully ease the headlamp surround away from the lights and off the wiper blade spindle. The surround will still be attached by the tube feeding liquid to the wash element of the surround, so be aware of this.
Ease the pipe under the spindle, and under the headlight itself (you're effectively working right to left here). This will give you enough space to remove and replace the valve.
Route the pipe back to where it was, replace headlight surround, wipers, close bonnet, feel smug.
