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Hi, I have a C205. Does anyone know where the seat belt extenders/feeders connect to please? Does it connect to the wiring harness of the front seats? From pictures of the front seat wiring on ebay I see it has a connector which looks like it can connect to that of the belt feeder but I’m not sure.
Thanks for the reply. Just to be sure, I’m talking about the seat belt feeders/presenters for example part number A2058600182.
Is this what you’re referring to?
I am talking about the front safety belts electric self-tensioners.
I am roaming overseas and now short on data until I get a recharge...
No worries. I’m actually looking at retrofitting the feeders in my C205 and the only thing I’m unable to find out is which harness this plugs into. If you manage to find out, whenever you get a chance, that would really help!
Thanks again!
No worries. I’m actually looking at retrofitting the feeders in my C205 and the only thing I’m unable to find out is which harness this plugs into.
If you manage to find out, whenever you get a chance, that would really help!
Thanks again!
I got my new eSIM APN 5G nearly sorted out... 1st time roaming on dual SIM unlocked phone.
You'll need to research WIS diagrams to get inspired AND figure how to program what modules to enable your new harness extension. Unfortunately nothing is plug'n play. It's doable if you have enough time and research motivation.
So from WIS I managed to find where the extenders connect to - the rear SAM unit. The wiring seems simple enough, the issue is on my car I don’t have the rear SAM unit (marked as N22/6 in WIS). From my limited knowledge, I understand the rear SAM controls either the rear windows on a 4 door, the soft top on a cabriolet or the belt extenders. My car has none of these so I guess that might be why I don’t see the N22/6 module.
The questions now is can the N22/6 be retrofitted and how - I need to research this.
So from WIS I managed to find where the extenders connect to - the rear SAM unit. The wiring seems simple enough, the issue is on my car I don’t have the rear SAM unit (marked as N22/6 in WIS). From my limited knowledge, I understand the rear SAM controls either the rear windows on a 4 door, the soft top on a cabriolet or the belt extenders. My car has none of these so I guess that might be why I don’t see the N22/6 module.
The questions now is can the N22/6 be retrofitted and how - I need to research this.
Did you find the main fuse box up front ?
Did you find the rear fuse box in the trunk ?
These fuse boxes are actually your two SAM Modules.
These fuse boxes are actually your two SAM Modules.
I read somewhere that there was a module under the fuse box in the trunk, but WIS was showing the rear SAM to be in the trunk on the left side. I will check the documentation for the one under the fuse box.
I read somewhere that there was a module under the fuse box in the trunk, but WIS was showing the rear SAM to be in the trunk on the left side. I will check the documentation for the one under the fuse box.
the trunk fuse-box is a SAM itself. They are one and the same.
Other makes call this BodyControlMofule (BCM)... its a smart fuse-box connected to a whole computer network via shared signaling.
Last edited by CaliBenzDriver; Mar 13, 2025 at 02:47 PM.
Then would you know what the first module below is please?
The first one is what I believe WIS is showing me, in the left side of the trunk. The wiring even match those of the belt extenders in WIS.
The second is the one you’re referring to.
If present, found in the left hand side in the trunk
I had another quick look in WIS.
You’re right, the module you refer to is the ‘rear SAM control unit’ which is N10/8
The one I’m referring to is simply called ‘rear control unit’ which is N22/6
As per the electrical diagrams, the belt extenders connect to N22/6, not N10/8. The electrical diagrams for N22/6 reference option code U02 which is for the belt extenders. There is no mention of this on N10/8.
Belt extenders connect to N22/6 which is the rear control unit, not the rear SAM control unit
Option code U02 (belt extenders) wiring to N22/6 rear control unit
I am going to volunteer to say... I don't think so!"
because module needs to be **programmed in**.
besides I have the belt tensioners and keep them disabled... I dislike how to tightens front passengers at each IGN key cycle.
I’m beginning to think this may be too much work. Unless I find anyone who has successfully retrofitted this then it looks like I won’t continue further.
Thanks for trying to help though!
I’m beginning to think this may be too much work. Unless I find anyone who has successfully retrofitted this then it looks like I won’t continue further.
Thanks for trying to help though!
there are other ways you can improve these cars better than stock... by that I mean stable voltage and improved oiling.
Last edited by CaliBenzDriver; Mar 14, 2025 at 04:52 PM.
Honestly, I would design my own electronics to operate that extender before I would attempt what you're doing, it would be much easier. In reality I'd just not do it at all, because extenders are just fluff and not actually needed. They're right there with the auto tilt steering wheel, that is a neat toy when it works, but in reality it's pointless and ultimately causes people grief. Imo.
Btw, I loved the rear SAM pix with the text "Found next to the fuse box in trunk" I immediately pictured you opening the trunk and seeing this exact unit, with all the wires cut, sitting next to the fuse box. Thanks buddy
Honestly, I would design my own electronics to operate that extender before I would attempt what you're doing, it would be much easier. In reality I'd just not do it at all, because extenders are just fluff and not actually needed. They're right there with the auto tilt steering wheel, that is a neat toy when it works, but in reality it's pointless and ultimately causes people grief. Imo.
Btw, I loved the rear SAM pix with the text "Found next to the fuse box in trunk" I immediately pictured you opening the trunk and seeing this exact unit, with all the wires cut, sitting next to the fuse box. Thanks buddy
😂 luckily all these pictures are from ebay except for the electrical diagrams of course.
But yeh, I’m giving up on this particular retrofit unless someone somewhere managed to do it already. Too complex for what it actually offers.
The custom electronics sounds interesting though, might be something I look into when I get some spare time.
We just plugged the extender onto the seat belt and use the extender to plug into the original buckle, and then use the original buckle release to release the extender. No rewiring required.
We just plugged the extender onto the seat belt and use the extender to plug into the original buckle, and then use the original buckle release to release the extender. No rewiring required.
I think you’re referring to a different type of extender, the ones that plug into the buckle. The ones I’m referring to are also called seat belt feeders/presenters and are electronically controlled by the car.
To anyone who reads this thread and crazy enough to attempt this, I managed to find that the extenders wire into the rear control unit N22/6. N22/6 has two wires into the CAN B distributor X30/32, and 3 wires that connect to 3 different ground points. The last 2 wires connect to 2 separate fuse boxes with 30A fuses. I think it’s doable but still a lot of work for what is mostly a fancy gimmick.
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