Just a quick thought.  Close the sunroof cover and see if it stops.
Those things can rattle a bit.

On 1/14/05 3:52 PM, in article 4lfgu0li8goq7p5oj4e20bre2o8kphru5k@4ax.com,

Check the stuff screwed to the bottom of the shelf - stereo speakers, nav
unit, child seat anchors, etc.   My '00 had a noise in that area when new
that was traced to a loose speaker. Put somebody in the back seat with the
pass-though open, drive around until it starts making the noise and get
him/her to reach through and try touching various things to find the source
by feel.  Your back seat passenger can also press up on the roof liner and
see if that makes it stop.

Also check that the spare tire and jack are securely screwed down and that
the tools are not bouncing around loose in the tire well. The sound can
transmit through the car body and sound like it is coming from a completely
different place.  

These things can be very difficult to trace unless you have a willing
partner to trace it while it is happening.  It can be practically anything,
from a failing shock absorber to junk bouncing around in the center console,
to loose anchors in the headliner.

go to www.acura-cl.com

may be the rear brake light - common noise source