05 Prius. Interior light on driver's side cannot be switched on. I checked the bulb, and there is continuity. Checked the switch; there's continuity. Checked for voltage at the white connector with paper clips stuck into the connector and got zero volts. I can't imagine there's a dedicated fuse for just this one item. Sounds like a broken wire, which is odd for a car with 100K on it. Any bright ideas what to check next?