The factory Volvo roof DVD player option uses power, ground, and reverse lights to control it. In reverse, the screen swivels up so that the rear view mirror is not obscured. The wiring loom connector is in the rear, by the right hand taillight.
The factory DVD player comes with a wiring loom from the rear taillight up the D pillar, along the roof (under the lining) to the DVD player location.
I also think that you need a metal crossmember fitted to mount the DVD player to. So if you get the roof DVD player from another car, make sure you get the loom and the crossmember as well.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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