Just to keep all the information on record here, I did open up the lid behind the engine-compartment fusebox to check the 15A fuse in the blue relay. The fuse was blown. The 30A green fuse was fine. I replaced the fuse and I shall see what happens. If that doesn't fix my problem I'll change the sensor that Arthur mentioned, and report back on that. The sensor is only a $50 (Canadian) part, but I'll go with the .50 fuse first.

Thanks again.

Jonathan