That tv button is for the BMW tv tuner. Im guessing the dealer or owner stripped the lcds from the headrests. Check in the back, where the nav module is there was a harness that plugged into the back of the module. Maybe yours had a vcr or bmw dvd and the owner stripped that too. Either way you shouldnt have those buttons if the screens are missing. Oh and the 2 blank buttons panels above them are for rear heated seats. Does the aux input on your stereo work. See if you can get some sound from it. If i can remember correctly the one you have in the rear gives mono sound.
On another note... NICE X.. Looks beautiful. Word of caution pic 7 (showing passenger door) for some reason the paint chips off the door handle / armrest area. I wish i would have sprayed some type of coating on that area. Be mindful of rings and sweaty hands in that area..otherwise very nice ride.

__________________
E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up