Does anyone know how does the passenger airbag indicator work on Model S? The user manual says if the airbag is off, it will show "PASS AIRBAG OFF", but does it show up constantly, or just when the car is started? I've never paid to much attention to mine until after a recent service visit, I noticed that the indicator always shows up few seconds when switching to Drive then disappears for the rest of the trip regardless if someone is sitting in the front passenger seat or not. Can anyone check how it works in your car? Thanks!