CLA 2014: Annoying noise under the co-driver's seat

[Pampos]

Hello guys,


when driving into a certain speed or when there are abnormalities in the road, an annoying noise is coming out from below the co-drivers seat. I understand some kind of resonance is happening.
This noice can re be reproduced also when hitting/vibrating the seat from the top neck.
I noticed that when someone is seating on it the noise is gone, and also it doesnt happen when the seat is fully at the most forward position. Another strange observation is that when i move the seat forward/backward, the noise is decreased and then again gradually increased.

What I explain you can see it from the videos below:

Streamable - free video publishing

Streamable - free video publishing

Streamable - free video publishing


i am not sure but I believe the noise is coming out from this area:





Please share your opinions, I am in a dead end

 

[grober]

There would appear to to play somewhere in the seat mechanism. This may be of help?
DRIVER'S SEAT MERCEDES CLA-KLASSE [Car] [CHASSIS] (EUROPA)
To investigate further probably requires seat/frame removal for inspection from underneath.

 

[NOMONEYBUTAMERC]

The only problem I get with resonance from the passenger seat is when its occupied, not when its empty.

 

[MercedesDriver]

Bloody hell if it sounds like that while driving it must make you mad.
It looks like the seat is not aligned with the guides, hence the rattle dissapears when someone seat on it.

 

[Pampos]

Bringing this up again... I noticed another interesting fact. I haven't found the issue yet, but since i live in Cyprus, during the winter the noise went away..

Now that the summer is back it started slowly slowly.

 

[Pampos]

i mean it might be somehow related to the temperature.

 

[grober]

You need to get the seat + mechanism and out on the bench to test-locate the source of the noise- its either the seat mechanism or where its attached to the car. Removing from the car will eliminate the second