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Rear passenger seat rattling noise at lower rpm

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Old Mar 20, 2015 | 04:50 PM
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C300
Unhappy Rear passenger seat rattling noise at lower rpm

My C300 (Canada) has less than 700 kms on it and I'm hearing a rattling noise under the passenger side rear seat. The noise is pretty noticeable when the engine is idling, and it gets worse as I move into 1st gear. The strange thing is, there is no noise when there is a passenger sitting on the seat. Which leads me to believe that something within the actual seat has come loose.

Has anyone else had any noise issues with their seats? Can I lift up the rear seats in any way? The issues started after I tested out folding the seats
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Old Mar 20, 2015 | 05:52 PM
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2015 C300 Sport Package
Maybe you did not fold the seat fully to the upright position?
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Old Mar 20, 2015 | 06:11 PM
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No I checked for that. The seat is firmly placed up right. I also checked to see if the seat belt buckle or the holder is the cause. The sound seems to come from below the seat. When I press down on the seat (the sitting area) the noise stops. Sometimes the noise is really noticeable and sometimes it faint.
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Old Mar 20, 2015 | 10:43 PM
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C400
How about where the seat belt clicks into? I have a rattle on my passenger seat and noticed it was only when I was alone in the car. Determined it is a plastic piece inside of the part where the seat belt clicks into. Haven't taken it to the dealership just yet as it hasn't annoyed me enough but it's getting close!
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Old Dec 26, 2015 | 07:10 PM
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2017 C43 sedan
Ever find the rattle?
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Old Dec 29, 2015 | 12:10 AM
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Originally Posted by Gungaslow
Ever find the rattle?
Nope. The funny thing is the rattling stopped in the summer, I'd occasionally hear something, but not too often. I'm hoping I don't hear it again this winter. Lets see..
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