Seatbelt Extender Question
Thread Starter
Newbie
Joined: Aug 2025
Posts: 8
Likes: 2
'21 E53 coupe / '15 C350 coupe
Seatbelt Extender Question
I hate to ask but have not been able to figure this out.
I bought a new to me 2021 E53 coupe a few weeks ago,
For the first week or so, the seatbelt extenders extended the seatbelts as expected.
Then the driver's side stopped.
That was after I played with all sorts of settings, but I did not intentionally change the extenders (I don't even know if you can).
I have searched through the owner's manuals and looked online (including these forums) for an answer but am not finding anything.
Any suggestions?
I bought a new to me 2021 E53 coupe a few weeks ago,
For the first week or so, the seatbelt extenders extended the seatbelts as expected.
Then the driver's side stopped.
That was after I played with all sorts of settings, but I did not intentionally change the extenders (I don't even know if you can).
I have searched through the owner's manuals and looked online (including these forums) for an answer but am not finding anything.
Any suggestions?
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
I hate to ask but have not been able to figure this out.
I bought a new to me 2021 E53 coupe a few weeks ago,
For the first week or so, the seatbelt extenders extended the seatbelts as expected.
Then the driver's side stopped.
That was after I played with all sorts of settings, but I did not intentionally change the extenders (I don't even know if you can).
I have searched through the owner's manuals and looked online (including these forums) for an answer but am not finding anything.
Any suggestions?
I bought a new to me 2021 E53 coupe a few weeks ago,
For the first week or so, the seatbelt extenders extended the seatbelts as expected.
Then the driver's side stopped.
That was after I played with all sorts of settings, but I did not intentionally change the extenders (I don't even know if you can).
I have searched through the owner's manuals and looked online (including these forums) for an answer but am not finding anything.
Any suggestions?
Thread Starter
Newbie
Joined: Aug 2025
Posts: 8
Likes: 2
'21 E53 coupe / '15 C350 coupe
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
Thread Starter
Newbie
Joined: Aug 2025
Posts: 8
Likes: 2
'21 E53 coupe / '15 C350 coupe
Sorry for the confusion, this thing.
https://cimg4.ibsrv.net/gimg/www.mbw...7f84276f8.jpeg
https://cimg4.ibsrv.net/gimg/www.mbw...7f84276f8.jpeg
2021 E53 does not have such a switch.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
They might have integrated that button in the infotainment, or try looking on the light switch side and the assistant buttons panel, this panel https://cimg8.ibsrv.net/gimg/www.mbw...05da2f6680.jpg
Although this image doesn't show the button.
Although this image doesn't show the button.
Thread Starter
Newbie
Joined: Aug 2025
Posts: 8
Likes: 2
'21 E53 coupe / '15 C350 coupe
They might have integrated that button in the infotainment, or try looking on the light switch side and the assistant buttons panel, this panel https://cimg8.ibsrv.net/gimg/www.mbw...05da2f6680.jpg
Although this image doesn't show the button.
Although this image doesn't show the button.
No button there either.
Only 'button' I find in a settings screen, but it doesn't do anything.
it shows an image of the seats with those seatbelt extenders, but you can't touch activate it, nor trackpad click, no left / right or sub-menus, etc.
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