glhboy

I have a 2012 CT200h premium and I can't figure out this damn sunroof rattle for nothing. It only happens when it's closed all the way. I've read and read and read and nothing seems similar to this. It just has a weird rattle that's hard to explain. If you push up on the sunroof glass while it's closed it won't rattle. I've tried putting sticky felt on the sides of the metal body sunroof surround and I thought that had cured it, but it comes back! So I reapply more felt, remove old, etc.. and it still comes back. It's not the bar that raises when the sunroof opens as I can hold that down and it still rattles. It's enough to make me hate this car. I don't know what else to try. I'm out of warranty and just hit 50,000 miles. I can't seem to find anything online to try and I'm not prepared to remove the headliner to fish for something.

Any suggestions?

nacke

Can you provide some pictures of the sunroof system? Maybe someone gets an idea. There are many similar complaints with different Lexus models on this forum. On some models there's somekind of wind deflector on the front edge, which starts to rattle when sunroof is closed.

glhboy

I'm not sure what to take pictures of, there's not much to see. The more I read about it, people are either saying it's the wind deflector - which I don't think that's it on mine because I can hold it down when the sunroof is closed and it still makes the noise. Then others say it is possibly the weatherstripping around the actual glass sunroof. That seems kind of odd though.

CharlesCA

I am having a similar issue. It's not the deflector for me either. The sound goes away when I tilt open the sunroof.

glhboy

I ordered a new sunroof gasket that goes around the glass to see if that will help. I've never replaced one, but read online that this could be the culprit.

sktn77a

iTrader: (2)

Before you go throwing time and money into this, why not have your dealer try to diagnose the problem?

xaznx

I'm having the same problem, anybody have a solution or find the culprit yet? Thanks

E46CT

Dealer charges $90 an hour to diagnose. Min. 2 hours. lol.

Does the sunroof fit fairly flush to the glass? I'd consider undoing the glass and reattaching it in a slightly different position. you may have to anyway to replace the gasket. Then you'll attribute the fix to the new seal, when the whole time, it was the position of the sunroof glass. I wonder if it's been replaced before? See if it has a Lexus logo or if the screws have tool marks on it.

offroad200

I can 99.99999999999% guarantee (but not 100% ) it's the sunroof seal. It's common on CTs. It fixed the rattle on my GF's CT. As soon as I mentioned it to the head mechanic at the local dealership (and where I also work), he said "it's the sunroof seal". And he was right!

xaznx

How do replace it? It sounds pretty easy as simply opening sunroof and popping off old seal and popping it back on?

offroad200

Sorry I'm just getting back to you. Easy answer is yes, basically. You have to do some working of the seal to get it attached. It's easier to remove the glass and then replace the seal. It only held in by 4 torx screws, 2 per side. With the sun shade pulled back, you'll remove a cover on each side and you should see the screws.

HOMER350

I had this issue on an IS.
The seal, or weather strip, was the issue. Happens on the GS as well.

It caused a rattle on the IS seemingly coming from the REAR wheel or trunk area. It was hard to believe a seemingly fine moonroof weather strip was the source...but it was.

Read enough about it on other models that wouldn't be surprising if the CT was no different.

pwrusr

iTrader: (10)

any update on this, mine is driving me crazy and yes it only happens when it closed

HOMER350

The weather strip as mentioned above. Try that out

E46CT

I keep my seals, including sunroof seal, conditioned using german rubber conditioner. I hope this helps.