I'm hoping someone here might have the answer to this irritating problem.

Basically when the rear wash wipe is used it operates as expected but then the front window also gets a soaking (and the front wipers don't come on). Dangerous if your not expecting it!

The cars in warranty so just need some ideas before going to see the dealer.

I'm thinking faulty switch or pump but I don't really understand how it operates

job done under warranty - was the pump