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Old 01-07-2014, 03:50 PM
barkford's Avatar
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Join Date: Apr 2002
Location: Charlotte, NC
Posts: 157
W210 - 1998 e300 mercedes with ortho seats

After doing some article searching, i am hoping to confirm some troubleshooting steps for my new (new to me) e300. Symptom: the ortho seats have been completely dead since i bought the car. No hissing of air, no movement of any kind when moving either the driver or the passenger switches. The door locks and fuel filler door work fine. I do on occasion here the air pump working when unlocking doors.

Question: where to start on troubleshooting? Should i check for an air tube disconnect at the pump under the back seat? Is it possible to see these air tube connections feeding into each seat without disassembly? Just looking for the basics first.

Any advice is greatly appreciated and i am happy to update this post with what i find to share!!
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Old 01-07-2014, 05:23 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Without a diagnostic tool to check programming and inputs it will be pretty hard to do, The first thing that comes to mind is to look for a disconnected (electrical)connector at the PSE pump, since you are hearing no air leak I'd assume a tubing disconnect is not the problem. I am not sure if the PSE monitors pressure buildup in the lines and possibly would time out in the case of a disconnect, or a cut line, or a bladder leak in the seat, these all could be possiblities if the PSE pump times out.
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Old 01-09-2014, 02:28 AM
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Join Date: Jul 2005
Location: Seattle, WA
Posts: 546
for some reason, my brain is telling me that "MKE" port services the ortho seats.
if your pump is same as my 99 E320, it would be lower right corner.

check pump outlet for air
check hose leading to front seats air control module for air
pop off rear seat cover and check for air leak at the connectors

....and hope that it isn't in the air bladders themselves. but the manner in which
you're describing the total lack of function at all air bags, i'm thinking it something
further upstream towards the pump.

the air hoses can become hardened and fail, especially if previous owner had
man-handled them
-- raymond~
47 34'N 122 18'W
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