Dynamic Seat Air Cushion Behavior
Thread Starter
Junior Member
Joined: Feb 2010
Posts: 22
Likes: 7
From: Dallas TX
W221, S65
Dynamic Seat Air Cushion Behavior
My '08 S 65 Drivers Dynamic Seat Bladder threw a DTC which I did not record before erasing it. Speicfically, the right side bolster does not inflate as quickly as the left side bolster when rounding a corner and I assume it is due to a leak. All other dynamic seat inflations work properly. Accorcingly, I purchased a used replacement spring frame air cushion and when it arrived I noticed that one of the side bolsters still was slightly inflated. The other side, shoulder and lumbar air cushions are completely deflated. The one that still has air in it cannot be deflated by compressing it as the valve wont release the entrapped air. Does this indicate that the bladder inflation solenoid valve is defective? Is this bladder supposed to be completely deflated with no power to the inflation valves? If so it needs to be returned as defective before I attempt to install it. Help is appreciated.
Rick
Rick
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Joined: Oct 2021
Posts: 1,196
Likes: 636
From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
My '08 S 65 Drivers Dynamic Seat Bladder threw a DTC which I did not record before erasing it. Speicfically, the right side bolster does not inflate as quickly as the left side bolster when rounding a corner and I assume it is due to a leak. All other dynamic seat inflations work properly. Accorcingly, I purchased a used replacement spring frame air cushion and when it arrived I noticed that one of the side bolsters still was slightly inflated. The other side, shoulder and lumbar air cushions are completely deflated. The one that still has air in it cannot be deflated by compressing it as the valve wont release the entrapped air. Does this indicate that the bladder inflation solenoid valve is defective? Is this bladder supposed to be completely deflated with no power to the inflation valves? If so it needs to be returned as defective before I attempt to install it. Help is appreciated.
Rick
Rick
Thread Starter
Junior Member
Joined: Feb 2010
Posts: 22
Likes: 7
From: Dallas TX
W221, S65
They both inflate although one inflates considerably and faster and more fully when turning than the other side does when turning in the opposite direction. They dont behave the same as one would expect. This has given rise to a DTC and the system deactivates once the code is thrown. My question has to do with the bladder condition of the removed bladder assembly when the vehicle is shut down/power removed from the inflation control module and removed from the vehiclle. Are the bladders supposed to deflate completely when power is totally removed from the air cushion assembly? In other words, do the inflation valves open completely allowing any pressure to be relieved when the unit is disconnected from all sources of power. Or is it normal for the valves to entrap a certain amount of air even though power has been removed. If they dont deflate completely, is it normal to have one bladder semi inflated and the other to be completely deflated? I dont think so. The replacement part I got has one bladder completely deflated and the other retains some air that cant be squeezed out when on the bench. I think this indicates a valve malfunction/faulty bladder assembly so Im asking the forum for clarification before I install a questionable part in the car.
