Pushing the end of the wiper stalk does nothing, and pushing the buttons on the display does nothing. I have the handbook and this is what it tells me to do - could it be the relay, and if so where would I find it. I don't want to try taking the stalk apart (I have found instructions for this) when it would appear that if it was only the switch in the stalk then I should still be able to toggle the display using the buttons there?