Pyrofuse removal
Super Member
Joined: Jun 2017
Posts: 608
Likes: 107
From: Western NC
2009 MB C300 Sport 4matic
That's my feeling...the one prior poster pried up without releasing tabs and broke the base where the tabs engaged. The replacement profuse fit back in fairly snug luckily.
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Super Member
Joined: Jun 2017
Posts: 608
Likes: 107
From: Western NC
2009 MB C300 Sport 4matic
Give these people a call..they have pyrofuses that look like ours or can point you in the right direction hopefully. Good Luck.
https://www.myairbags.com/
https://www.myairbags.com/
Super Member
Joined: Jun 2017
Posts: 608
Likes: 107
From: Western NC
2009 MB C300 Sport 4matic
The pyrofuse in this post had "blown" because of an impact I presume (not my original post) which disconnects battery power. The pyrofuse normally has 3 ohms of resistance across the sensor lead terminal, 0 when blown, so resistor tells ECU system intact. I also have heard this resistor insert is used when the squib from an airbag has blown 2nd accident, it will fool the pyrofuse into sensing a functioning airbag which I suspect was the reason for the resistor add on here.
Newbie
Joined: Sep 2024
Posts: 1
Likes: 0
c300 4matic
The pyrofuse in this post had "blown" because of an impact I presume (not my original post) which disconnects battery power. The pyrofuse normally has 3 ohms of resistance across the sensor lead terminal, 0 when blown, so resistor tells ECU system intact. I also have heard this resistor insert is used when the squib from an airbag has blown 2nd accident, it will fool the pyrofuse into sensing a functioning airbag which I suspect was the reason for the resistor add on here.
Junior Member
Joined: Mar 2013
Posts: 36
Likes: 8
2002 ML 500
You pull up the top cap on the pyro to release it, easy as
The resister is to fool the computer to say the fuse is not blown.
It will not fix a blown fuse.
The Mercs have many high current fuses hidden in modules, in the ML I had a blown fuse in the module under the drivers floor. This gave an indication of a blown PYRO and all sorts of funny things like airbag faults no start etc.
I had to physically track the battery cables to find.
The fuses can be replaced, I think i have a post on it somewhere
I had a pyro error after all that and it was actually because the plug was seating. You have to pull the cap up, put plug in and push cap down. It actuates the plastic tabs people mention here that work like a clamp to connect. Do not try and mess with those little things the plugs are near impossible to find.
The resister is to fool the computer to say the fuse is not blown.
It will not fix a blown fuse.
The Mercs have many high current fuses hidden in modules, in the ML I had a blown fuse in the module under the drivers floor. This gave an indication of a blown PYRO and all sorts of funny things like airbag faults no start etc.
I had to physically track the battery cables to find.
The fuses can be replaced, I think i have a post on it somewhere
I had a pyro error after all that and it was actually because the plug was seating. You have to pull the cap up, put plug in and push cap down. It actuates the plastic tabs people mention here that work like a clamp to connect. Do not try and mess with those little things the plugs are near impossible to find.
Last edited by Terry WM; Sep 14, 2024 at 08:57 PM.
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,333
Likes: 689
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Is this a work around for a blown pyro fuse? i just picked up a 2012 c300 that had some very minor accidents yet passenger headrest is the only deployed item in interior no airbags deployed, the car will not crank at all but radio engine fans lights everything works i can put it in drive and shift but the car will not crank at all any suggestions, thank you.
