W177 Unfastened Seatbelts need replacing due to collision

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SPLIFFITHS

New Member
Joined
Jan 12, 2024
Messages
4
Location
United Kingdom
Car
A220d W177
To cut a long story short, I hit a curb at 35mph and the collision system kicked in. The driver and both back passenger seatbelts have now tightened beyond belief and have to be replaced. I completely understand the drivers belt doing so but why did the back two seatbelts? The seatbelts were not plugged in and nothing was on the seats to act as if someone was sat there. If the car thought the crash was that bad then I would've thought that at least the steering wheel airbag should've activated.

The back seatbelts have gone extremely tight I can barely even fit my fingers behind it.

If anyone has any guesses at why this happened or if it's supposed to then I'd love to hear it.
I hope it isn't expensive as I now have multiple things that need addressing due to the incident.

Cheers boys/girls
 

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It will be expensive Im afraid......its not so much the belts but the pretensioners. I assume you model had the mechanical preloaded spring type (rather than the electronic type). These can only be used once although Ive noticed online there are companies that offer to reset them. So it will be all the affected seatbelts...and all their connected pretensioners....plus the labour of removing trims, seats etc to get to them. Quite often not very old cars are written of by the costs. Not what you wanted to hear....sorry! There are used ones on ebay from less than £100 each though.

EDIT.....looks like you have the electronic sort....so no resetting those.

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It will be expensive Im afraid......its not so much the belts but the pretensioners. I assume you model had the mechanical preloaded spring type (rather than the electronic type). These can only be used once although Ive noticed online there are companies that offer to reset them. So it will be all the affected seatbelts...and all their connected pretensioners....plus the labour of removing trims, seats etc to get to them. Quite often not very old cars are written of by the costs. Not what you wanted to hear....sorry! There are used ones on ebay from less than £100 each though.

View attachment 151876
Appreciate the reply I was always expecting the worse. I'm just very curious as to why the back ones went off that has completely baffled me.
 
I don't think the rear seats have the load warning the fronts do. Does you car give you a warning that rear seat passengers have not got belts on like the old W169 A Class did?....if not the car would not have "known" if there were rear seat passengers or not.
 
I don't think the rear seats have the load warning the fronts do.
The rear seats of the W177 do have occupancy sensors.
 
Hmmmm....then I'm surprised the pretensioners fired.....but I'm far from and expert on seatbelts!!!
 
Hmmmm....then I'm surprised the pretensioners fired
It is, indeed, puzzling.

I could sort of understand it if all pretensioners fired, but the OP doesn't mention the passenger seat belt having fired too. Or maybe it has, but the OP hasn't noticed?
 
So do we think I should claim through the insurance for the back belts? I can't think of any situation in which they should've activated.
 
It is, indeed, puzzling.

I could sort of understand it if all pretensioners fired, but the OP doesn't mention the passenger seat belt having fired too. Or maybe it has, but the OP hasn't noticed?
I had a good friend of mine who is a Mercedes specialist use the Xentry to show the error codes. It only shows the driver and 2 rear passenger belts have activated.
 

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