I think the best way to check is to look up in the manuf. service manual, it will tell you the drain locations. I had a similiar case where there was excessive rust in the sunroof drain rails. I did a little research and poking and found that the drain tubes were clogged/pinched. Once you know where your drain tubes drop the water onto the pavement you can trace the tubes back to the roof from the side quarter panels and find the clog. I opened my sunroof and VERY carefully! used an indoor plant watering can and filled the Prelude's sunroof's drain gutters(MAKE , watched which corner tube drained(look for spill on pavement) and worked on the clogged ones.



I have a 1997 Prelude and it's power sunroof has 4 drain points, one on each corner. I had both rear and front right drain tubes clogged. The rear with dirt and the front right was clogged/clamped because the body repair shop did not route the hose properly and ending up clamping the hose. But now all are clean and clear. What a difference!