Leaderboard

EDIT: I live in south Florida and drive a '93 LS400 with the same wet headliner problem. There is nothing you can do to keep water from leaking past the moon-roof. It is designed to pass some water, that's why there is a catch-pan underneath. I wanted to replace the moon-roof gasket and was told by Lexus that the gasket itself was un-replaceable and that a new moon roof (just the glass with gasket) would cost $900. They did NOT say this would "fix" the leaking. I have the factory service manual and I can tell you that removing the headliner and sunroof assembly is not simple. The rear seat has to be removed, side pillar covers, window trim, seat belts all need to be removed in order to remove the headliner, it is at least a whole day, if not 2 day project. UPDATE (03/03/2014): I finally got it nicked. After removing the entire headliner, sunroof & tray assembly I noticed an accumulated layer of fuzzy crud in the bottom of the sunroof drain pan. Apparently this layer was absorbing water and slowing the progress of water trying to drain out of the pan. After cleaning this crud out and cleaning all hoses, drains etc. I replaced the assembly and waited for rain. When it rained I discovered that (arrgh!) Lexus had punched a bunch of holes in the drain pan for rivets, cable-runs, etc. and ALL of these were dripping water. NO WONDER the headliner was wet! A tube of silicone sealed the rivets and I had to unscrew the two cable-run housing assemblies from the drain pan (front, L & R) to goop them up with sealer. Re-assembled and waited for rain (not a long wait in FL). No water leaking from tubes, no water from rivets, housings, etc. and no overflow from drain pan. I can see rainwater flowing out of the drain pan through the drain tubes. My LS400 is again (relatively) watertight!