Odyssey MY11 Luxury - Play DVD While Driving

[evolution]

It's the former, ie the screen does not show movie - but can still hear the sound and control it. So do you think I can just purchase another monitor? Where should I install it? in the rooftop?

That's the way i would go. Got a 10.4" DVD screen mounted on the roof. That front HU would be too small and only 1 person in the 2nd would be able to view it comfortablly. With a roof mount everyone from the 2nd row can enjoy. Also if you get a 2nd monitor, the audio shop would have to remove the HU anyway, they might be more inclined to charge cheaper to install the bypass switch.

And even if they can't put in the switch for some reason, your passengers in the rear can still enjoy the DVD.

Forgot to add that this will only work if your HU has got audio and video output and it doesn't chop off the video feed when the car moves.