Only 500 miles on my 400 so I have not gone back to the dealer yet. Before I do, I wanted to check if anyone else has experienced this.

At speeds over 30 MPH there is s noise coming from the back that sounds a little like a metallic fluttering. I thought it might be a tag or something loose underneath, but nothing found. With someone in the back seat to help listen, it seems to be narrowed down to coming from under the seat, which would mean possibly something in the battery area. Could it be something with the battery ventilation operation?
Anyone else have a similar experience?
At speeds above 60 the road noise takes over and most of the time I cannot hear it. So I know, the solution is to drive fast!

 

hm....I better keep a check on that noise...just got a RX400h awd today...but won't pick it up until tomorrow...

 

I had a similar problem, it turned out to be the tournau cover in the rear. You might want to check that section out also.

 

there are known rattles in the back of the rx's, the touneau cover attachments, and in my 400h a rattle behind the back quarter panel that the dealer fixed in half an hour. there is also a known rattle in the exhaust that can be elusive, its part of a cover that gets loose i can look for the exact post. if you ride in the back as someone else drives you can usually isolate most rear hatch and quarter panel rattles.

 

I have that problem...sound wise.
However I am not sure if it is from the battery or what...


Mink92890

 

i had the problem...but i think it was my stupid cousin who was messing around with the back seats...managed to fix it so no more sound!