!! Please select country!!
Created: 27 Jan 2007
Last Updated: 11 May 2007
Mercedes D2B Fibre optic connectors
V1.0 29th January 2007
Certain Mercedes cars use D2B fibre optic systems for the Audio system components. Those systems include COMAND, Audio 10, Audio 30, Audio-30-APS, phone systems, linguatronic voice recognition, teleaid and the Digital Bose amplifier.
Note that in later cars (after the W211 E class), the technology changes to MOST bus, those parts are not covered in this document.
The D2B bus is a fibre optic ring, so if any device on it is disconnected or fails, the ring is broken and the system does not work.
In addition to the fibre optic ring there is an electrical 'wake-up' signal which causes the devices on the fibre optic bus to wake up their electronics - without this the devices would all need their fibre-optic electronic circuits powered up all the time which would drain the battery.
Each section of fibre is orange coloured and has a red plastic lens on one end and a white lens on the other. Those lenses/fibres clip into plastic connectors which then plug into the items on the bus.
The Wakeup cables are just all joined together, on many vehicles they are spliced together, on certains ranges they all connect to a multi-way connector called the Wakeup distributor. The wakeup cables are all blue/black coloured.
This document contains the part numbers for some of the connectors
There are two types of plugs, one right angle (which consists of 2 parts), and one that is straight through.
The part numbers are as follows: -
Sometimes it is necessary to connect two fibres together (a red lens and a white lens will connect together), there is a splice connector for that: -
Individual sections of D2B fibre can be ordered which come preterminated with a red lens at one end, and a white at the other.
These are ordered as follows: -
If you found this information useful, please support the site by making a donation via Paypal. Any amount at all helps me improve the information on the site.
Comand Online Ltd - the place to buy Mercedes iPod kits, phone kits, retrofit parts & map disks
MY AUTOCAR - THE BEST PLACE TO TALK CARS