Mine has never lit up. I can see it in the cluster and have run it dry multiply times. Too much effort to remove the fender liner to find out if its just not hooked up. Usually go through 2 gallons over the winter so i try to start with it full and check it around january or feb.
The owners manual for my '13, on page 10, WARNING/INDICATOR Lights says "Low windshieldwasher fluid warning light (if so equipped)" but says nothing about which models are so equipped. I'm not sure if mine is cause I've never actually run out.