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M&P USA Universal Fiber Optic Loop Bypass Loop Adapter Compatible with BMW, Mercedes & More

  • Based on 1,992 reviews
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Arrives Saturday, Aug 22
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Features

  • Compatible With: BMW, Mercedes, and Many More - SCROLL DOWN for more info
  • Proudly made AND supported in the USA! We are here to help you diagnose your vehicle
  • *USA* Product Support via TEXT or VOICE - PLEASE Contact us for help with the product, or your vehicle's SOS light or Audio Issue!
  • Lifetime warranty is included on all of our products!

Description

The M&P USA Universal Fiber Optic Loop Bypass Loop Adapter is unique and stands out from other fiber-optic bypass loops designed for European car multimedia troubleshooting, diagnostics, and permanent bypass procedures. Don't be fooled by competitors selling "pairs" or "2PC sets" of standard male & female fiber optic loops. The "male" loop included in these sets is useless for troubleshooting sound and SOS errors; it will end up in a landfill! The "female" loop in these sets often requires modification and cutting to attempt to fit the OEM multimedia component plug. Our Universal Female Fiber Optic Loop fits every time. No frustration, no waste! We are the #1 seller of bypass loops for a reason. We stand behind our product with best-in-the-business USA-based manufacturing, and diagnostic support. Every bypass loop comes with a contact card, so you can easily reach us for assistance with diagnosing your unique multimedia-related problem. Check our glowing, positive customer product reviews; we are 100% here to help! The M&P USA (Mods and Projects) fiber optic loop features a unique, universal, female style connector that ensures proper fitment! You may have noticed that our bypass loop looks different than other bypass loops out there - That’s because we modified it to universally fit the connector for every component in your vehicle including, but not limited to: · Satellite receivers · Power amplifiers · TCUs (Bluetooth) module · MULF units · CD changers · COM Boxes · MMI Modules The M&P USA (Mods and Projects) fiber optic loop is made in the USA and we follow USA standards you can trust. Please take the time to read some of our reviews. Sometimes, correcting the fault in your vehicle requires additional troubleshooting. If you continue to have problems correcting your audio or SOS light issue after installation of the loop we will work with you to troubleshoot your unique scenario to resolve the problem as quickly and cheaply as possible regardless of the issue. Our Fiber Optic Loop is universally compatible with BMW, Mercedes & any other automotive manufacture's multimedia components that utilize MOST (Media Oriented Systems Transport) technology. Our fiber optic loops are pre-modified to FIT every multimedia component connecter, every time! Please scroll down and check the compatibility list below for detailed vehicle compatibility information. When you test or bypass a multimedia component, you ONLY use the "Female" style fiberoptic bypass loop! Don’t be fooled by “pairs” or "2PC sets" of Male & Female fiber optic loops. The "Male" loop included in these "sets" is absolutely useless to anyone troubleshooting sound and SOS errors with their vehicle, we promise, it will wind up in a landfill! To make things worse, the "Female" loop in these "sets" often requires modification & cutting by the user to make it fit the plug on your multimedia component. Our Universal Female Fiber Optic Loop fits every time. No Frustration, No Waste! BMW: Our fiber optic loop is compatible with all BMW models from 2006-2011. (keep reading below for newer models) In BMWs, components with fiber-optic connections are identified by their green optical cables. The image on the left shows a typical component layout with the male MOST connector cable disconnected from a component. In BMWs, multimedia components are typically located in the trunk near the driver-side tail light, or in the bottom center area underneath the cover panel. Components and locations will vary based on your make, model and vehicle options (we will help you find them as needed). 2012+ BMW models utilize a consolidated communication module (com box) replacing the older, separate components used in previous years. Our fiber optic bypass is compatible for testing purposes, however, 2012+ BMWs will likely require further troubleshooting (we are happy to help). Mercedes: Our fiber optic loop is compatible with most Mercedes models from 2004-2011. Mercedes vehicles generally have more components connected to the fiber-optic network than BMWs. In Mercedes, components with fiber-optic connections generally can be identified by their orange optical cables. The image on the left shows a typical Mercedes component layout. In Mercedes, vehicles’ multimedia components are typically located in the trunk near the driver side tail light, or in the bottom center area underneath the carpeting panel. Component locations will vary based on make and model, we will help you find them as needed. Once the component you wish to test is located, our fiber optic bypass will fit . Other Vehicles: Countless other vehicle manufacturers utilize MOST (Media Oriented Systems Transport) technology. To check compatibility simply locate one of the components in the trunk area and look for a fiber-optic cable connection; they are typically either orange or green cables. Once located, disconnect the connector from the component to check and see if it looks like a male MOST connector (reference the two male plug examples in the image on the left). Either style of male optical connectors loop shown in the photo are compatible with our fiber optic loop. Note: There are additional styles of fiber-optic connectors out there, as long as the spacing and diameter of the two on the connector match, our loop will work. If you're not sure, you can always order one of our fiber optic bypass units, give it a try, and return it if it does not fit.. We promise, we wont be offended :)

Compatible Devices: TCU, MULF, Amplifier, Satellite Receiver, CCC, CIC


Connector Type: MOST Female


Color: Orange


Item dimensions L x W x H: 3 x 5 x 0.5 inches


Brand: M&P USA


Compatible Devices: TCU, MULF, Amplifier, Satellite Receiver, CCC, CIC


Connector Type: MOST Female


Number of Ports: 1


Power Plug Type: No Plug


Brand: M&P USA


Model Number: 1cb80526-e151-4a5f-8fdf-048c0e4ba5b2


Manufacturer: M&P USA


Mfr Part Number: 1cb80526-e151-4a5f-8fdf-048c0e4ba5b2


Warranty Description: 1 Year


Item Dimensions: 3 x 5 x 0.5 inches


Item Weight: 7 g


Package Quantity: 1


Unit Count: 1 Count


Number of Items: 1


Color: Orange


Finish: Matte


Warranty Type: Lifetime


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Aug 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Cheap, effective trouble-shooting tool for early 2010s BMW audio systems.
Bought the M&P universal fiber optic loop bypass adapter to help troubleshoot a bad component plaguing the audio system in my BMW e70 X5. With the help of this loopback tool, I was able to zero in on the faulty amplifier. Part replaced and I'm back in business. Anyone with a 2010s era BMW should keep one of these on hand. Could save hundreds in diagnostic charges to have a dealer basically do the same thing. Fit perfectly in the fiber port on each of the audio components in the fiber optic system of my car. ... show more
Reviewed in the United States on June 9, 2026 by PNW Keith

  • The only adapter that fits! Instantly fixed the issue.
Immediately fixed my issue on my E60 M5. My audio stopped working, as well as Bluetooth, plus an SOS malfunction. I found a guide on troubleshooting MOST bus issues. I removed part of the liner in the left side of the trunk to expose some modules. I checked the MOST connectors on the Logic 7 Amplifier, SAT module, and TCU. There was a red light from the amp and SAT, but not the TCU. This indicates the fault is likely with the SAT module. I ordered this (after trying a different one that didn't fit), and the second I plugged it in my audio kicked on. SOS warning went away and I was able to connect to Bluetooth. Luckily, I don't use SiriusXM so I don't need the SAT module and can leave the bypass plugged in. Well this seller knows their stuff and included a zip tie with the connector. A small gesture and little detail, but it was nice to see the recognition of the issue. This is the one to buy if you need a MOST bypass adapter. Thanks! ... show more
Reviewed in the United States on September 5, 2025 by Anthony

  • Fixed my SOS fault / audio issue on my BMW E90 caused by dead Sirius XM module
Easy fix on my 2007 BMW 328i wagon (E90 E91 E92 generation) for an SOS fault which causes the audio to not work. Used this to bypass the dead Sirius XM radio module in the trunk. Open the driver side hatch in the trunk, pull out the connector on the back of the Sirius XM module and pop this into the connector to link the two connector terminals (one connector terminal is lit up and the other is not lit). Done! 2 minute job if you know where to go. Even came with a zip tie to secure the loose connector now that it's no longer plugged into the back of the Sirius XM module. Highly recommend. ... show more
Reviewed in the United States on September 4, 2025 by Gregory Chu

  • No audio , bypass fix
Got the bypass was a little skeptic on the bypass working .starting diagnostic the fiber optics system in my 2013 c300 with no audio.found the issue with the media module .once I install the bypass turn the car on I had audio I recommend this bypass
Reviewed in the United States on March 19, 2026 by jose

  • Outstanding customer service!
The stereo cutting in/out In my wife’s BMW 330i Has been the source of irritation for the last 2+ years. Our local BMW dealer quoted us $1100 to fix this issue, which I politely declined. Recently I stumbled across this fiber optic loop fix on YouTube and decided to purchase one. Directions were straightforward and very easy, even for someone like myself who HATES chasing electrical gremlins. In our car there was four modules that could be suspect so one by one we pulled the green connector and placed the fiber optics loop into that connection (which affectively bypasses that module from the system) and then checked to see if the stereo was again operating correctly. Went through the entire system and to my dismay the issue still persisted. I remember reading many reviews before I purchased this Fiber optics loop and it was mentioned that the gentleman (Adam) who Manufactures and sells this item Is very willing to help troubleshoot if need be. Matter-of-fact there’s also a small card that accompanies this fiber optic loop with contact information should you have a problem. I contacted Adam and within 20 minutes I received a text message and then a phone call. Honestly can’t even remember the last time I had a vendor contact me willing to help remedy a situation. Adam went through each step with me and while doing so I explained that over the last 24 months I had replaced a couple of the modules with used in an effort to remedy the situation. Adam explained to me that these pieces have to be coded correctly with the same identical software for them to function properly In the system. He advised me to put the old modules back into place and then troubleshoot the system again. Within 10 minutes of doing this found that the TCU module that also handles Bluetooth for the car was defective. I can honestly say in all my years I have never experienced customer service like I received from this gentleman in his company. Definitely owe him a huge debt of gratitude. His product and customer service is second to no one. ... show more
Reviewed in the United States on August 11, 2022 by Kim

  • Solves the No audio problem
If your reading this you have done extensive research on how to get your audio system going in your bmw. I have a 2008 BMW 750li. The satellite unit when bad causing the whole "I" drive system to go down. The system operates via fiber optic cable. this loop bypasses the bad unit thereby give you audio again. The loop takes 10 seconds to install but to get to that point takes 10 mins. You must pry the inside trunk panel on the driver side to expose the satellite unit. have a small zip tie ready to secure the loop in place to the original fiber loop. While your in there take a pic of the Bluetooth module if your car is equipped with one. you will need that to pair your phone to the car. This unite works!! ... show more
Reviewed in the United States on December 10, 2022 by John Drake

  • Unsure of the value on my 2006 Mercedes
Bought it for a 2006 ML 350 Mercedes, trying to bypass controllers on the MOST fiber network, but it didn't fit (two small) on the Motorola cellular controller I was trying to bypass. Still trying to find if it works elsewhere in the car.
Reviewed in the United States on July 26, 2026 by JS

  • 1st! - Confirm APPLICATION
1st confirm application - You're probably only getting this product for a very specific fix. Mine was a 2008 BMW 128i with the radio stopped working. The interweb said its most 'likely a bad XM satellite receiver. So, I went there. All other possible reasons were messy, and I knew I had a bad receiver but until recently the radio still worked. 2008 is kinda old, so not worth fixing XM. This fiber optic cable by-passes the bad XM module. In my car the module is difficult to reach. Interweb didn't have specific instructions how to access. After examining and some luck I removed the black bracket that held the module. This worked. Otherwise, could not access plug. Remove black plug. This cable snaps into place into 2 FO slots. And they include a tie wrap just to make sure it doesn't unsnap. OK to remove XM and leave cables in place. $18 seemed a tad pricey, but way less than $600 a repair shop would have charged. I find these real-world fixes very satisfying. Way better than any video game. Good service. Fast delivery. Nice packaging. It worked. ... show more
Reviewed in the United States on July 6, 2026 by WI Badger

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