2012 "v": Center Seat Belt Trim Removal (Ceiling) ??

My educated guess is the headliner has to come down at least partially to remove that trim. I would further speculate the trim may be glued or screwed on to the headliner from the back using two interlocking pieces. If the purpose is to work on the seat belt tensioner, then the headliner has to come down, at least the rear part. You could subscribe to the Toyota Information System website for a $20 weekend and search for headliner removal and it "might" tell you. But if it's part of the headliner assembly it won't. It appears the black tensioner part is separate and is probably securely bolted to the roof. See pic that shows another rear belt. To get to this level of disassembly requires taking off a series of rear hatch panels as they interlock on top of each other, starting at the bottom. Another option would be to check with an auto upholstery shop that does headliners. They might know for sure. This picture comes from a pdf I put together a few years ago detailing steps to change the satellite antenna base.

 

Before you take the headliner down, consider going to a Toyota parts counter and ask for that trim piece. If Its available, they should have an assembly drawing showing any screws or push on tabs. This can give you useful information one way or the other.

On another note, this video shows a roof rack that does not require holes in the roof.