2010 Ford Fusion vanity lights will not come on when door opens
Note the diagram for interior lamps. Did you check the fuses? Use a test lite and check voltage at fuses, hot all the time. Make sure dimmer isn't turned all the way down, some makes and models, you can turn interior lamps out, with the dimmer. I saw some manufacturer specific codes for interior lamps. Check for codes. To check codes, yourself, at the least, you need an obd2 code reader, that will work with your vehicle and read manufacturer specific codes. Maybe a door switch has a problem?
