That's what I was thinking. In my old 928, there was even a separate tank with a different fluid supposedly more suited for the type of debris the headlights are catching.

BenT

sent from my electronic leash

On Feb 10, 2013, at 10:47 AM, David Beierl <dbeierl@ATTGLOBAL.NET> wrote:

> 
> I'd be interested in seeing the diagrams, but I imagine that
> connection enables the relay when the lights are on, so you don't
> waste fluid when you're not using the headlights.