If they're anything like the trim clips in the engine bay, then what you do is:
- Pry up the center piece with a screwdriver
- Lift up the center piece until it stops
- Lift the sleeve (bumper) piece up. The whole clip should come off.
Code:
______
|__ __|
||
|| <-- Inner piece
||
_||_
\ / <-- Bump in inner piece causes
\/ clasp in outer piece to expand,
locking the assembly in place.
::
::
\/
____________
|___:____:___| <-- Outer piece
-----|| ||-----
/////|| ||///// <-- Trim surface
-----|| ||-----
// \\
\\ // <-- Clasp can contract to allow
\\ // outer piece to be removed.