Remove dvd headrest and wiring to install in another hummer

Here is a post with a video that should help you.
https://www.pacificaforums.com/forum/505-child-safety-car-seats/3866-remove-headrests-2nd-row.html

I think it must be in theft lock, contact a GM dealer.

You will have to chase the wires with a metal snake.

Yep, its pretty easy, lower the screen down, your find 4 phillips screws, unscrew them, them the dvd will separate from the headrest. be careful not to tug on the wires too tight, push the button on the connectors to free them from the circuit board, label the white one goes on the left and red connector goes on the right. now you have the dvd free and can remove the screws on the back to free the cover on the front, the button should be stuck between there. have fun

no tey do not. the wiring would have to be run through the seats

Instructions with pictures to follow:

Most volvo headrest can be removed by releasing the catches which are on the back of the headrest on some models and on the front on others I believe on 960 they are on the back. To release the seat on a 960 look where the shafts should be then follow it down on the back where the seat back top stops then goes in press around that area you should be able to find the catch there pull up on the headrest while releasing the catch you have to do this on both sides. The headrest should come off this also works on 740 and 760 series the volvo 780 is a different story the only way to get the headrest off on that is to disassemble the seat

push & hold button on headrest while pulling up

blower quite working is this because of the blower resistor conection

yes the screen has to sandwich the material from the headrest to hold it in place.....