Lonely Boy.

Hi NeilJ I have finally discovered that the source of my A pillar water ingress was a faulty/failed windscreen seal. A new windscreen fitted seems to have cured that issue but I have now found other wet areas around the passenger footwell and NS rear passenger footwell. I am optimistically hoping that it was just old water in the vehicle that has moved around as I finally took the vehicle on a trip involving some steep climbs and descents over the mountains on the cars first trip since the new windscreen was fitted. You can only live in hope. The car is back into the garage on Tuesday to fault find the battery drain issue on a newly installed battery when I purchased the vehicle less than 3 months ago. Its pretty gob smacking that Lexus's parent company Toyota. Possibly the biggest car manufacturer in the world has so many issues with water ingress. I have seen water issues recorded for Auris, Aygo, Prius, Rav and our collection of various Lexus models. Failed and cracked seams, welds, disintegrating gaskets, door membranes etc. My other car is a Toyota Prius and it has water ingress issues for 7 years now. Thanks to Olu for the Rav roof rail video.

Just checking Neil, is your leak at the bottom of the A pillar or like mine, at the top of the A pillar where the A pillar trim meets the headlining?

Hi NeilJ Thanks for the prompt reply. After giving the problem some thought today, it seems to me that the water ingress on my car can only becoming from the top of the vehicle, ie failed windscreen seal. roof bars, failed structure joint or antenna seal. Do not have a sunroof so blocked drainage channels a non starter. This morning after reading up on the issue on various forums, I went and checked the carpets front and back and they are damp. I noticed my windscreen seals are not great and as the car is a 2006 model, time is against her. Windscreen seals look like a starting point. I also noticed that the windscreen is a FUYAO make and I have been checking to see if this is an original but I haven't come up with the answer yet. As you say NeilJ, these things are sent to test us. I will continue with a process of elimination. Can I ask you a question regarding your RX? Does you car have a roof antenna? If so, have you checked the seal? Also, further up this thread, I saw a reference to double skin. Referring to the roof panel. I was thinking that both our leaks cold be elsewhere on the vehicles and depending how the car is parked and angled, water could be pooling else where within the roof panel and once we are on the move, motion and angle and pitch could force that pooled water to the points at where we see the water enter the vehicle. It just so happens that on both our vehicles it's at the same point on the A pillar but on opposite sides of our vehicles. Good luck going forward. I'll update as and when.

Hi NeilJ I have only just purchased a very low mileage 2006 RX300 without a sunroof and I am experiencing the same problems as yourself. Water on the NSF A pillar joint with headliner, dripping down. I haven't done anything yet as I only noticed this water ingress last week. I have been researching forums in an attempt to establish the cause and direction I should take to rectify the problem. Have you finally cured your issue yet? Are you in a position to add further to your thread?