There was probably contact sparking/arcing that put interference on all 12V supplies for a time.

Hi.

I know this is an old thread, but it's still topical. My wipers just stopped working ( fronts only) Rear and Front wash working and rear wiper working normally.

All fuses checked etc.

How do you get the Comfort/convenience unit from the pedal box? Is it just the two screws?

I don't fancy getting the drivers seat out as I can get upside-down to see it.

The relay only clicks when Fast wipe selected - but still no wiper movement.

Thank you for your indepth write up about replacing the relay inside the BCM.