This D2B Fiber Optic adapter allows you to retain the factory Mercedes-Benz BOSE amplifier audio system when installing ANY aftermarket radios. The output from all speakers, including subwoofer and premium sound quality. This makes for a nice clean, easy install.
When installing this interface into your Mercedes-Benz, you must ensure that the fiber optic signal loop is not broken. In addition, if you have other devices, including the original CD Changer, satellite radio, and telephone module, they must consistently stay connected to the fiber optic signal loop.
To identify if you have a fiber optics D2B factory-amplified audio system, you can check the vehicle in several ways. Some vehicles will have clear markings on the speaker grills indicating the presence of an upgraded audio system. You can also check with the original order notes/invoice from when the car was purchased from the factory. The upgraded sound system with an amplifier would show on the options list. If unsure, you can call your local dealer with your vehicle's chassis number and ask them to check if the car was manufactured with an amplified audio system. If you are unsure, please send the VIN and a photo of your car's existing dashboard to info@carnaviplayer.com, and we will help you check.

Installation video: https://youtu.be/gjzgNCU2XCo

Compatible vehicles:

Mercedes-Benz A-Class(W168) 1997-2003
Mercedes-Benz C-Class(W203) 2000-2006
Mercedes-Benz CL-Class(C215) 2000-2004
Mercedes-Benz CLK-Class(A208/C208) 1997-2003
Mercedes-Benz CLK-Class(A209/C209) 1997-2004
Mercedes-Benz E-Class(W210) 1995-2002
Mercedes-Benz G-Class(W463) 1998-2004
Mercedes-Benz M/ML-Class(W163) 1997-2005
Mercedes-Benz S-Class(W220) 1998-2003
Mercedes-Benz SL-Class(R230) 2001-2004
Mercedes-Benz SLK-Class(R170) 1998-2002
Mercedes-Benz Vaneo 2002,2003,2004,2005
Mercedes-Benz Viano 2004,2005,2006
Mercedes-Benz Vito 2004,2005,2006

Connection map

Wire 1 and Wire F connect together (Positive of battery).
Wire 2 connects to the positive of the cigarette lighter(Ignition powered)
Wire 3 and Wire E connect together(GND of battery).
Wire 4 RCA audio input connects to the Front left and Front Right audio output of the aftermarket head unit.
Wire 5 and Wire C connect together(amplifier wake up).
Pull the fiber optic plug from plug G and plug it into plug 6.

In addition, you also need to use MB part # 000-545-33-84, which connects the two ends of the D2b plug together (this is accomplished by removing the fiber ends from the plug) and wrap these new loop connectors in electrical tape: they will ground out otherwise which causes audio to cut out until the amplifier restarts.
D2B Coupler: https://www.pelicanparts.com/More_Info/0005453384.htm?pn=000-545-33-84-M22

When unplugging these devices, you must remove the fiber optic connectors and install a connector loop between the two ends. The part number to accomplish this is 000-545-33-84. Removing the original connectors is simply a case of pulling a grey "key" out of the lower side, and the wires will come out. 

CD Changer - Remove all panels behind the driver's seat until you get to the amplifier.
Cell Phone - Behind the center console, a panel is removed to get to the amplifier (between the two rear storage boxes). You will see the fiber wire running and a module in the center that needs to be disconnected.
Voice Control - This unit is next to the amplifier (under the storage behind the driver's seat). I believe the connection is underneath, so you must look closely for it.

Frequently asked questions:

Q.  Can I return this for a refund if I do not like it?
A:  NO. We warranty the product for one year. If there are any problems with it, we will replace it with a new one for you.

Q.  Why are there only TWO RCA inputs?
A:  It only supports stereo input from your front Left and Front Right RCA audio output.

Q.   If it only uses TWO RCA audio cables, how will I get sound from all of my speakers?
A:  The MOST interface will convert the TWO RCA audio signals into a fiber optic signal your factory amplifier can understand. Your BOSE amplifier will distribute sound to your speakers, including your subwoofer.

Q.  Can I control fade and balance after this is installed?
A:  You can control only LEFT RIGHT balance since it only uses those two RCA audio cables. No fading from Front to back.

Q.  Does this support steering wheel button controls?
A:  This does not add or remove the steering wheel button control. It only has one function: to convert RCA audio into a fiber optic signal the factory amplifier can understand.