My biggest gripe with my Yaris is the single speed rear wiper: rarely is it possible to keep it running for more than a few seconds before the screen is too dry. I end up turning it on and off almost constantly when I am driving on a wet motorway. Time to do something about it. First step was to buy a wiper stalk for a 2003 Corolla from eBay. The Toyota wiper stalk has the front intermittent relay built in to it: fixed interval on the Yaris, variable interval via a swivelling ring on the Co