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Photo DIY - SRS Seat Sensor replacement

358273 Views 157 Replies 77 Participants Last post by  caleno69
Your SRS light has come on and stays on, Also you noticed that the airbag off light stays on as well. Your car has never been in an accident, and your bags and belts have never deployed. You have some basic mechanical aptitude and don’t want to pay a dealer 500-800 $US for this repair. Read On…
It is not necessary but best to look for an independent mechanic shop that displays the 'pie', and have the codes read, this will tell you exactly what the problem is. Most will not charge for this service, and unless you have the MB software and can read the exact pin, you can’t do it..

Lets try and address the most common questions regarding this condition.

Q; - Is this a safety issue, the car still runs and a friend of mine who has a 2000 210 has a piece of electrical tape over the light and just drives it. Do the air bags still work?

A; No, Operation of all SRS devices are unpredictable, they may not fire at all, or they may fire for no reason

Q; How many Sensors are there and where are they?

A; Many.. The SRS system has a pre-tensioner in each seat belt, several air bags, sensors throughout the car to activate same, and a child sensor in the front passenger seat.

Q; Before I tear my car apart I would like to know as much as I can, what the module looks like and yhe functionality and design information

A; The child sensor adjusts air bag and seat belt level for the front passenger, and effects the functionality of several other devices.

Q; Is a sensor of some kind in the drivers seat?

A: No, a seat belt switch, and seat belt tensioner , and air bags.

Q; If I replace the Ass Mass will the light go off?

A; BE Clear Here, when you fix the fault, The Light WILL go off by itself if all faults have been corrected.

Q; How do I do this repair myself?

A; On the next posts, you will see a series of pics, but the procedure is,,,
1. At some point, have the codes read, by an inde, (PIC 1 ) as having the seat pad SRS light on will 'MASK' other ( emergency tensioning retractor belt and bag) faults.
2. Buy a NEW sensor first, (PIC 2 ) I have not seen ANY signs of wear ( wires, scraping, breaks ) at all. The sensor 'dots' fail with use/age. Sensors cost 140 US$ at MB.
3. TIP- Take the seat out of the car, period. If you have never done one, and are not an MB tech, or leather repair expert, 5 bolts and some clips and the seat is out. Don't even try to in car cover remove. you will me$$ it up!
4. TIP- Allow an extra 2 hours to shampoo the carpet under BOTH front seats. which is what you will do when you see all the gack under the seat. My car gets 'mini detailed' weekly and it still had lots of filth under the seat(s). Record amount of coins found so far.. $16.83 US$’
5. Unplug all wires from the connector block (PIC 6-7 )
6. Snap off the bolt covers (PIC 8 )
7. Remove all four 'Torx' type bolts (PIC 9-10 )that secure seat rails in place on the car floor.
8. Pull OUT not up on seat belt bolt cover(PIC 11 ) and remove bolt.
9. Release the wire cable (PIC 12 )
10. Tip the seat top down and remove the complete car seat from the car.
11. Remove the connector block and unplug the yellow sensor (PIC 13 ) connector from it's housing under the seat.
12.Take off the plastic side covers.
13. Loosen the 2 back bolts, (PIC 14-15 ) and remove the 2 front ones, This is optional and done to make the job easier.
14. Push down on the leather, (PIC 16-17 ) and pull out the bar that holds it to the frame.
15. Twist 90 degrees on the plastic ‘butterfly’ clips, (PIC 18-19-20 ) and release the leather cover.
16. Change out the sensor pad (PIC 21-22-23 ).
17. Once you have removed the sensor pad unit replacement is simply a reverse procedure. (PIC 24-25-26 )

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Discussion Starter · #2 ·
Next pics

Here are the next set of pictures.
 

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Discussion Starter · #3 ·
More pics

Here are the next set of pictures.
 

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Discussion Starter · #4 ·
Last pics

More pictures
 

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Discussion Starter · #5 ·
The last set of pics

Final pics
 

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Discussion Starter · #22 ·
Yet another success

Thank you Matt, Greg, OL, I am soooo not worthy, enjoy.

B
 

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Discussion Starter · #31 ·
4524 hits World Wide.......

I had no idea this diy would be so popular.
I should have had my nails done for the photos.
It was a honor to pay back just a bit of the thousand$ of dollars (US) that this site has saed me.
You all are most welcome.
B
 

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Discussion Starter · #35 ·
AH yes...... yet another success story

Those butterfly clips are a bit of a challange, I just snap them back with one hand pushing and twisting up on the clip, and the other pushing down on the seat cover rod. Also, I look between the seat cover and pad to insure line up.

Also, I have heard that the new sensors might need to be adjusted or version coded for the car. Any input would help.

Glad so many have found this helpfull, and thanks again to the person who edited.

B
 

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Discussion Starter · #40 ·
9,300 and counting, wow...

By all means check that wire and replace it if possible.

Just don't take it 2 MB and give them 1,000 US$.

DIY on dudes.
B
 

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Discussion Starter · #48 ·
12279 hits and counting, oh my god...........

I had no idea this would go this far, thanks again greg and lord and all those who helped.

Let me see, 12279 at 1200 means that we have saved members $ 147,348,000 from the full dealer repair price.

MB must hate me.

OBTW- Hello from Stuttgart.

B
 

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Discussion Starter · #58 ·
Sorry to hear you need the pad...

Also, I have helped on 8 of these now, and I now solder the connections when replacing the wire.
Also, Also, Do Not.... try the incar pad replace if you keep your car in mint condition as most our members do, You WILL scratch somthing and then you will see that scratch every time you get in the car.
The audience here is first time novice DIYers, and with our wisdom and guidance they do quite well.
B
 

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Discussion Starter · #65 ·
You STILL have...

to go premium you know...

B
 

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Discussion Starter · #70 ·
WOW great diagrams

Wish I had them 3 years ago.
B
 

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Discussion Starter · #74 ·
words fail me....again....

Many thanks to Greg, Olord, and all those who helped fine tune this thing.

What a team !!!!!!!!!!

So this diy has saved members and others over 10,000,000 US$, wow....

B
 

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Discussion Starter · #77 ·
Color coded plugs... yes

Some of the early usa 210's had the old sensor from the 124 testbed, these are res and will not talk to the srs computer in a nice enough way to b used.

The yellow plug is the most common and is what we used.

GOOD CALL Tallguy when dealing with 'jesus parts' we must be very carefull with parts and craftmanship.
 
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Discussion Starter · #83 ·
Great. Tips

Indeed, thank You, and all who have helped.
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Discussion Starter · #92 ·
Still going strong after all these years...

The wire is to the car, the fixed plug is to the seat, again try and fix/replace that short wire, but take your time and get it right.

This post just keeps on going and going. I am so happy that so many have contributed and found it usefull.

Keep on DIY ing.

B
 

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Discussion Starter · #122 ·
Glad we could help

has it really been ten years???
omg.........
 

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Discussion Starter · #126 ·
Most Any High Quality Wire..

will do the job.
To date, I have been unable to find a strap wire that is an exact replacement.
I do repair these now, and that is working well.
do solder the connections and carefully insulate ( shrink ) them.

So happy we could help.
B
 

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Discussion Starter · #133 ·
And it goes on and on...

I am so proud of all of you who have used this post to fix this common error.
DIY on....

B
 
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