So i have the same car. And it looks like i need a different harness.

Bro do you have a updated video of that? I have the exact same car as him and I wanna put a different radio in mine

I need some help on it too i have a c230 do you have an updated video?

How do I do it?

For anyone coming to this: I've installed a boss radio into a 2004 Mercedes c240. After soldering the wires from the harness I bought to the new radio, the radio did not work. Before continuing, I would check the fuse for the radio. This fuse is #64. It is in the fuse box under the hood in the upper-right hand side. It is a red 10 fuse. My solution was to first solder all of the wires except red and yellow to the corresponding color. Next, solder the yellow from the radio to the red on the harness. Lastly, you should see wires coming from the cupholder towards the driver's side that run under the ashtray. These wires are for the car charger. For me, there were three wires (brown, yellow and black, and I think purple). Cut the yellow and black, strip the wires, and twist them together WITH the red wire from the radio. You will probably have to get some wire to make it reach from under the ashtray to the radio (I used 16 gauge wire). Cap it off or use electrical tape. Then tape off the yellow from the harness that should now be unused. I hope this helps someone!

Please point me into the direction of a harness for simple plug an play I will be waiting