[DaveB]

Right then! Here's a brainteaser for you fellow Bimmer techies. It's only a niggle to me but it gets on my nerves.

Problem
When I activate the rear washer, the wiper starts immediately, followed eventually by the washer. My concern is that in the 2 seconds it took for the washer system to prime and spray the wiper has done 1 full cycle and effectively dry wiped the rear screen with all the grit that was on it - hence causing micro scratches that make wiper blades less effective at producing a streak free wipe.

I drove a friend's 2009 5 series Touring last week and when I hit the rear washer button on that the washer fired straight away hence the wiper was wiping a wetted screen from the start.

Challenge
Does anyone know if there's a difference between the 5 and 3 series systems?
Is there a way of either delaying the wiper from starting to give the washer a chance to prime itself or even speed up the priming of the washer so my car works like the 5 series?

I have a 2006 e91.

Many thanks in anticipation.