Sumit Bhasin

My COMMAND system has been acting up lately. When I start the car, the Mercedes LOGO comes on for a few seconds and then restarts. It gets stuck in this loop. If I keep hitting the Radio ON button over and over again really fast, it finally boots up and works normally.

I believe I have an issue with MOST ring. Seems like one of the components (Amplifier, Navigation, Radio etc.). I want to troubleshoot the MOST ring by individually connecting a fiber optic loop/bypass to each component one by one to find out which one of them is failing. I'm trying to identify the correct bypass loop and need some help.

Ebay/Amazon shows that the following bypass will work on my car (2007 S5550 W221):
https://www.ebay.com/itm/Fiber-MOST-...9XBfD2&vxp=mtr

But I saw a video in which the mechanic was using a completely different type of a bypass loop:

Can someone advise if the eBay bypass would work?

Jaap

Nope that one does NOT fit.
I got the exact same one, seller promised to send another one, he didn't (and the complaint time expired).

Sumit Bhasin

Thanks Jaap. Did you manage to buy from some other place?

Uegrad85

Sumit Bhasin

I know the YouTube guy is selling them. I just don't know who to believe.. the YouTube guy or all the eBay sellers who are selling a different version. Has anyone tried either on a 2007 W221?

hyperkare

Hi everyone,

This post isn't new, bit I'll still share my workaround. I have some issue finding the right loop for my 2005 w221 and I have made one:

1st get a fiber optic loop of any brand
Optical ring
2 Extract carefully the optic fiber and I use a piece of straw from my kids juice and adapt it


Fiber ring installed with straw pieces

Then electric tape

I know it's awfully but it works perfect
then my faulty part is bypassed