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Dynamic Seat Vacuum Pump and Reservoir Replacement
 
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Pelican Technical Article:

Dynamic Seat Vacuum Pump and Reservoir Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$200

Talent:

***

Tools:

T25, T30 Torx drivers, trim panel tool, Phillips and flathead screwdriver, 10mm socket

Applicable Models:

Mercedes-Benz E320 (2003-09)
Mercedes-Benz E500 (2003-06)
Mercedes-Benz E55 AMG (2003-06)

Parts Required:

Vacuum pump, insulators, vacuum lines, vacuum reservoir

Hot Tip:

Work gently with lines so the connectors don't break

Performance Gain:

Repair broken vacuum lock system

Complementary Modification:

Replace both components at once

Mercedes-Benz W211 models are equipped with dynamic seats in the front of the vehicle. These seats are equipped to fill and exhaust the air cushions of the multi-contour seat according to the requirements that are read by the operating switch. The seat controls can save the actual contour and adjusting stored contours, maintain the adjusted pressure values, and adjust nominal pressures of the individual cushion areas are controlled continuously.

The dynamic lumbar support function: Starting with the active air cushion, the pulsation occurs alternately in both lumbar support duo cushions. After the program is finished, the original cushion pressure is restored. The pulsation occurs in pressure jumps of 50 hPa each, upwards or downwards. The residual time can be parameterized.

The vehicle dynamics seat function combines the advantages of a comfortable seat with those of a sports seat. To achieve this, the lateral support during cornering is improved through an automatic pressure increase of the outside lateral support cushions; in the seat cushion (under the thigh area), the lumbar support area (four behind the back) cushions (the four cushions are coupled in pairs), the lateral area (side support cushions) cushions that are coupled with one another can be actuated in the hydraulic unit. The air supply that is necessary to fill the seat cushions is provided by the dynamic seat pump and stored in the reservoir. The adjusted contours can be stored.

When the pump fails or a leak develops, fault codes with be stored. The system will try to inflate or adjust as requested. If the system does not achieve the adjustment within a specified time period, the fault code is set. This fault code, retrieved using a Mercedes-Benz scan tool, can direct you to the root cause.

This tech article will show you how to replace the pump and reservoir. It will also show you how to test the reservoir for leaks.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The pump (red arrow) and reservoir (green arrow) are located in the left side trunk (fender) area.
Figure 1

The pump (red arrow) and reservoir (green arrow) are located in the left side trunk (fender) area. To access them, the trim panels have to be removed.

Start by removing the trunk carpet.
Figure 2

Start by removing the trunk carpet. Lift the handle and pull it out in the direction of the red arrow to remove it.

Then remove the lower carpet panel.
Figure 3

Then remove the lower carpet panel. There may be plastic rivets in the areas indicated by red arrows. My vehicle did not have them. If you do have them, lever out the center rivet. Then remove the rivet. Use a trim panel tool.

Next, remove the foam support.
Figure 4

Next, remove the foam support. Lift it up and remove it.

Remove the two 10mm fasteners for the electronics cover (red arrows).
Figure 5

Remove the two 10mm fasteners for the electronics cover (red arrows). Then lift and remove the electronics cover from the trunk.

Next, working at the left side carpet trim panel, remove the two plastic rivets (red arrows).
Figure 6

Next, working at the left side carpet trim panel, remove the two plastic rivets (red arrows). Using a trim panel tool, lever out the center rivet. Then remove the rivet.

Next, remove the two cargo anchors (red arrows).
Figure 7

Next, remove the two cargo anchors (red arrows). Lever off the plastic cover (inset). Then remove the T30 Torx fasteners (green arrow).

Now the trim along the bottom of the trunk opening has to be removed.
Figure 8

Now the trim along the bottom of the trunk opening has to be removed. This photo shows the left side of the panel. The right side has the same clips. Remove both sides (red arrows). Using a small flathead screwdriver, lever up the center of the clip. Then remove the clip from the panel.

Lift the panel up and off the trunk opening.
Figure 9

Lift the panel up and off the trunk opening. Then disconnect the trunk light electrical connector (red arrow) by pressing the release tab and pulling it straight off.

Then, pull the carpet panel away from the body.
Figure 10

Then, pull the carpet panel away from the body. Feed the trunk arm (red arrow) out of the carpet panel as you swing the panel away from the fender (inset). You don't have to fully remove the panel. I just swing it toward the center of the trunk. This leaves enough work space.

Now you have access to the pump.
Figure 11

Now you have access to the pump. To replace the reservoir, the pump has to be removed, so I will show you the steps for the entire process, as if you were replacing both. Only follow what you need to replace. Peel back the sound insulation on the pump. Then disconnect the electrical connector by squeezing the release tabs (red arrows) and pulling the connector straight out.

Lift the pump up and out of the mount.
Figure 12

Lift the pump up and out of the mount. Angle it toward the front of the vehicle as you remove it. Remove it only far enough to be able to remove the sound insulation.

Remove the sound insulation from the pump.
Figure 13

Remove the sound insulation from the pump.

Working at the lines (red arrows), remove them from the pump by pulling them straight off.
Figure 14

Working at the lines (red arrows), remove them from the pump by pulling them straight off. Be careful during this step. The lines are delicate and can break. Wiggle them gently as you pull them straight off.

If you're just replacing the pump, check the part number (red arrow) and confirm you have the right one.
Figure 15

If you're just replacing the pump, check the part number (red arrow) and confirm you have the right one. Then reverse the steps to install it. You can install a used pump if needed, as the price will be quite cheaper. However, the reliability of a used part is always in question. If you're replacing the reservoir, follow the additional steps.

Reach into the pump mount.
Figure 16

Reach into the pump mount. Press the retaining tab. Then slide the mount up to remove it (red arrow).

Remove the CD changer mount fastener (red arrow).
Figure 17

Remove the CD changer mount fastener (red arrow). Mine was missing. I believe it should be a T25 Torx.

Once the fastener is removed, swing the CD changer mount out and away from the fender.
Figure 18

Once the fastener is removed, swing the CD changer mount out and away from the fender. Leave it connected to the bracket.

Working below the trunk arm spring, remove the 10mm support fastener (red arrow).
Figure 19

Working below the trunk arm spring, remove the 10mm support fastener (red arrow).

Follow the support to the corner of the trunk.
Figure 20

Follow the support to the corner of the trunk. Remove the two 10mm fasteners (red arrows).

Working above the trunk arm spring, remove the T25 Torx fastener (red arrow).
Figure 21

Working above the trunk arm spring, remove the T25 Torx fastener (red arrow).

Working above the support arm and body panel, remove the T25 Torx fasteners (red arrows).
Figure 22

Working above the support arm and body panel, remove the T25 Torx fasteners (red arrows). Then swing the support (yellow arrow) up and out of the way. Leave it attached to the body.

Working at the bottom of the reservoir, remove the lines (red arrows).
Figure 23

Working at the bottom of the reservoir, remove the lines (red arrows). Remove them from the pump by pulling them straight off. Be careful during this step. The lines are delicate and can break. Wiggle them gently as you pull them straight off.

With the reservoir removed, inspect the connections to the seat (red arrow), the pump (green arrow) and the pressure relief line (yellow arrow).
Figure 24

With the reservoir removed, inspect the connections to the seat (red arrow), the pump (green arrow) and the pressure relief line (yellow arrow). Swap the lines to the new reservoir. Then reverse the steps to install new parts. To test the reservoir for leaks, see the next step.

Install the vacuum caps at the seat line connections (yellow arrow).
Figure 25

Install the vacuum caps at the seat line connections (yellow arrow). Then apply vacuum to the pump line (green arrow). The reservoir should hold vacuum. If it doesn't, remove the other lines and seal the nipples to narrow down what is leaking. The pressure relief line (red arrow) is designed to vent the reservoir in an overpressure situation.


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Comments and Suggestions:
giannis Comments: hello i have a w211 and i bought seats that have dynamic seats...it came with the pump and reservoir but wiring was damaged..my question is how many pins the cable to the pump has 3 or 4 and what colour??
November 15, 2016
  Followup from the Pelican Staff:

I don’t have that info.



I would grab a repair manual. It will have the wiring and terminal info.


Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
TBone Comments: I have a 2009 S550. The passenger seat bladders inflate individually and the dynamic action appears to work properly as well as the Pulse Mode. However, the driver seat bladders will NOT inflate individually and the dynamic level automatically returns to zero when turning it on the Pulse Mode works properly. I previously heard a solid "pop" sound in the drivers seat like a balloon bursting.
Am I correct to assume the driver seat bladder has a hole in it?
If so, how difficult is it to DIY replacement?
and what is the estimated cost of the bladder?
November 13, 2016
  Followup from the Pelican Staff: Sounds like it. You can try to block the pressure and vent line coming out of the seat (once full), if it still loses pressures the bladder is faulty. - Nick at Pelican Parts  
Webbo Comments: Hi there my seats work for about 10 seconds then fail. It's been on a star computer and no fault codes listed for the car. All I was told was they felt the pump was week. Any thoughts on moving forward ... New pump?
August 12, 2016
  Followup from the Pelican Staff: I would guess at either a leak or the pump is failing. - Nick at Pelican Parts  
Barndoggy Comments: I have a 2005 E320 4matic Wagon. I'm replacing the pump but having trouble removing the line connectors from the old pump. Also, I'm replacing the original, 211 800 01 48, with the newer 203 800 00 48. It's a different shape, so I know a new bracket is needed, but do I need new line connectors, too? Thanks!
August 6, 2016
  Followup from the Pelican Staff: Use a pick to release the line tabs.

if the pump is updated, there may be an updated kit for installing it. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Jorgen Comments: Forgot to mention: it's a S211 E500 Wagon 2004.
July 5, 2016
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
Jorgen Comments: My fault codes are all regarding the left seat:
a Pressure relief valve opens without active overpressure; b Switch S109s2 or S109s5 does not open,
cleft seat cushion depth,
d lumbar top
e right lateral support
f left lateral support

and right seat:
a Switch S108s2 or S108s5 does not open
b left lateral support

Where to begin fixing it? The air cushions or the valves?

Cheers
Jorgen
July 5, 2016
  Followup from the Pelican Staff: Sounds like the module has determined over-pesssure sue to valve malfunction. I don;t have the info regarding location of the valves. I would however start with the vent / valve for the circuit with the fault. - Nick at Pelican Parts  
Can Comments: Hi There
There are no leak in the reservoir, the lines looks fine and apparently the pump works.
Is it possible even with the pump turning on and working at least it is not dead that the strenght of the vacum generated is not enough to make the dynamic seat alive ?
May 18, 2016
  Followup from the Pelican Staff: Yes, the pump could be faulty. Quick way to check. When you are trying to work the system, does the pump get hot? if so, it may not be building pressure. - Nick at Pelican Parts  
Jack Comments: I'm retrofitting drive dynamic seats as an upgrade from my multiconture seats. I have one hose going to the pressure reservoir to fill it with air, but what gets attached to the second nipple on the pump?
May 2, 2016
  Followup from the Pelican Staff: What vehicle year and model, what is the pump from as well? - Nick at Pelican Parts  
JimmyMac Comments: I have a W211 2006 E55 with the dynamic seats and they unfortunately aren't working. To do a scan do I need the star system or will any OBD scanner work? Also the link to purchase the parts for this project link isn't working, could you please provide me the part #s for the pump heard rumors of a redesigned version, reservoir and lines?

Thanks
April 4, 2016
  Followup from the Pelican Staff: You will need an advanced scan tool. OBD code readers only display generic engine fault codes.
I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
alexu Comments: Hi
I have a 2004 W211 E55.
Can you advise the fuse location for dynamic seats please?
After the resiviour I guess there is a seat controller are these for each seat?
January 15, 2016
  Followup from the Pelican Staff: I don’t have that info.

I would grab a repair manual. It will it.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Jeroen Comments: I made a drawing.
Do I understand it right?
Where is 3 for. Called SK on the compressor
December 14, 2015
  Followup from the Pelican Staff: 3 goes to a filter, or small open cap line, for inlet to compressor. - Nick at Pelican Parts  
Jeroen Comments: Figure 14: The hose of the black connector.
Where is it going to?
Thanks
Jeroen
The Netherlands
December 13, 2015
  Followup from the Pelican Staff: To the seats. - Nick at Pelican Parts  
CLS 55 AMG Comments: Dear nick,,update: i replaced the broken pressure relief line,,and yes i can hear the pump working when i start the car,,but still massage button flashes when i press it and nothing happens,,dynamic seats stull not working..i double check the lines and all are fit and snug in place,
November 6, 2015
  Followup from the Pelican Staff: Do you have vacuum at the pump and at the seat hoses? - Nick at Pelican Parts  
CLS 55 AMG Comments: I have a 2005 cls 55 with dynamic seats..unfortunetley not working
I have inspected the air lines and all seem snug into place perfectley except for one,,it is the yellow arrow pressure relief line in fig.24
It is only connectd to the air resorvar perfectly and the other end is loose and noticed it is broken,,is it suppose to be loose as it is a pressure relief line or Where does it connect?
Also once i start the car i hear some kind of warning sound coming from the pump continues beep.
Im tryng to figure out if the problem im facing is the bump or the air line mentioned above.
October 19, 2015
  Followup from the Pelican Staff: When you start the vehicle and attempt to use the seats, does the pump turn on? - Nick at Pelican Parts  
Amenendez1 Comments: Hi, My Dynamic Seats are not working before disasembling anything, is there any fuse controling the pump?, it ocasionally Works but mostly is off. everything seems fine, no broken lines,
July 28, 2015
  Followup from the Pelican Staff: I am sure there are fuses involved. You didn't mention what vehicle you have, so i can;t be more specific. - Nick at Pelican Parts  
Al Comments: It looks like a couple of the connections to the reservoir were not very snug. So, I pushed them in for a tighter fit. Question: where does the pressure relief line go, does it just hang loose? I could not see where it plugged into.

Now seats are nice and filled with air!
July 11, 2015
  Followup from the Pelican Staff: It can hang below the unit. - Nick at Pelican Parts  
Al Comments: Hi There, I recently had my Benz W211 2005 scanned and got this message:

Code: 9254.
Pressure Relief valve for draining opens without active overpressure run.

Supplemental info on Faulty Seat Code:
M40/1. Pneumatic pump for dynamic seat control.

Reading thru your step by step, I am wondering if the problem is in my pump or reservoir? Could you tell ?

Thanks.
April 27, 2015
  Followup from the Pelican Staff: Sounds like a possible leak in the lines or pump. I would look for a leak before replacing anything. The reservoir stores vacuum, so if there is a leak, it will be affected. It is possible the pump can't make the pressure.

Run the system, see if the pump runs long and if you hear any leaks. - Nick at Pelican Parts
 

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