Cadillac 2005 XLR - Manual (Page 107)

13. Reach in from the side of the vehicle and under the
top to remove the headliner plug. The plug will be
located in the center of the top near the front.
14. Insert the wrench into the bolt beneath the plug
location. Turn the wrench about one-quarter turn
counterclockwise until it stops while gently pulling up
on the center of the top to release it.
15. Hold the top in the front and side and lift the top out
of the stored position.
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