Had exactly the same problem. A word to the wise ... if the rear washer pipe freezes it can 'pop' at the water bottle too. If you find this has happened, once you have re-connected it, do not be tempted to keep trying to get water through if none appears at the rear washer after a few tries. In my case the pipe not only disconnected at the bottle, but also inside the passenger compartment. When I found the disconnection at the water bottle I assumed I had fixed the problem so kept pumping water for too long, resulting in a saturated carpet and a dead sensor unit. Check both places