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Old 04-24-2007, 02:56 PM
eppy's Avatar
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Join Date: May 2005
Posts: 4
Is there any way to test a seat recognition sensor?

I read through a bunch of posts regarding the seat recognition sensor. Most people pay $130, I just got a cost of $250 for a 2002 E430 4MATIC.

I had the prob where the light would go on and off when someone sat in the seat. Took it all apart and found a wire was broke. I fixed that and I am still getting the light.

To further complicate things, last ice storm I slid down a driveway and damaged the 3/4 of one side of the car (@ $6K) and so I don't know if I might have tripped a sensor.

So the other question is, I ordered an OBDII reader. Will I be able to retrieve the codes for the SRS system with an OBDII reader?

Or is there a way to check the seat recognition sensor with a volt/ohm meter to test it to see if its still good?


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Old 04-24-2007, 07:50 PM
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Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
UNDER $1000.00-$2000.00 OBDII reader. Will not able to retrieve the codes for the SRS system you need SDS to do this job.
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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Old 04-24-2007, 11:09 PM
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Join Date: Oct 2006
Location: McDonough
Posts: 78
Eppy, I had to replace the one in my 2000 E320 and it was no where near $250. I would get a quote from an indie, that's what I did and was able to get one for around $125 if I remember correctly. I plugged the new one in before I installed it and all worked normally. If it didn't fix the problem I could have taken it back but luckily it fixed the problem. If you replace it yourself I can tell you from experience it helps to have another set of hands when you do it. Getting the sensor in place, getting the clips to hook, etc. etc. is really a pain if you are going to do it yourself.

Oh and the OBDII reader will not tell you SRS codes but it sounds like you've got it narrowed down to the problem due to your light going on and off when someone sits in the passenger seat.
86 Nissan 720 P/U - 285K miles and counting!!
91 Volvo 240 - 218K miles and still going strong.
00 Mercedes E320 - 111K miles and lovin it!!!
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Old 04-25-2007, 03:40 PM
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Join Date: May 2005
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I got a price from two different places one of them from here and the price was $250.

That is why I am asking to see if there is a way to test it?

I'm pretty sure they sending the whole seat cushion with the sensor in it. Did you get just the sensor or the sensor and leather seat cushion?
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Old 04-25-2007, 04:01 PM
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Join Date: Dec 2005
Location: Atlanta.
Posts: 366
No, they will send you the sensor grid and you have to remove the old one and put the new one in.
The grid lives under the cushion and I have never heard of anyone getting the cushion with the grid, otherwise that would probably cost a grand or so knowing M/B.

The job is not bad if you pay attention.

It helps to remove the entire seat from the car, then remove the seat back to access the part and flip the seat over and over while fiddling with it.

Pay attention to how the wires are routed and you will be pleased how easy it really was to do.

If you are halfway descent mechanically, you will do fine.

You probably have set a code that will not go away until a SDS is put on it to clear codes.

If you repaired a broken wire,and that was the only problem, you may just need the code erased with a laptop.
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Old 12-25-2007, 11:35 PM
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Join Date: May 1999
Location: Philadelphia, PA USA
Posts: 272
w210 E430 1998

Did you every find out what it was... I am having the same issue with mine W210 E430 1998.. The SRS light stays on as well as the Air bag off light on the console.. Regardless if someone is sitting there or not..

Peter L. House
1998 Sport E430
Azure Blue
110,000k Miles

1987 Oldsmobile Cutlass Salon
V8 Bucket Seats
Factory Moon Roof
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