When I pulled mine out I had the same question, the black is the antenna, the green is the camera, the heavier red connector is the USB. ThePAC RP4.2-MB11 came with all the connectors that go to my new Kenwood HU.

 

Mine only had the main harness plug with the antenna, camera & usb connected. I always just use the wireless CarPlay, but was surprised to find out the factory in dash USB works to charge my phone too. But I never really use that USB, I installed a aux battery cig lighter socket that runs a fast charger if a change is needed.

 

New Unit is the following
View attachment 21736

What is it? Link? An acquaintance has something similar, but his required modifying the vents. This looks like it will fit right on.

 

Google Search

 

Anyone know if the blue connector is for the factory mic?

 

On my 2019 the blue is for factory gps antenna:

I did not connect my unit to the factory mic. Instead used the aftermarket mic and routed to the ceiling control panel.

 

Bummer, it's the one thing that bugs me. I don't like the aftermarket mic, I'd much rather use the factory one, but not many people seem to know how or where that is connected.

 

I looked at the factory mic in the control panel, and that connection alone seemed very difficult to remove without breaking. I thought I could have replaced the aftermarket unit mic with the factory and having it invisible. However if you install in the mirror plastic housing in the headliner, it won't be very noticeable and you will forget it is there.

I also thought that maybe the aftermarket microphone would be more "optimized" for the head unit and a possibility of a bad connection would be less.

If you haven't already, you can read more on my installation thread:

Kenwood DMX1057XR stereo install and DRV-N520 Dash Cam

This is my first ever stereo install and I read many helpful messages on this forum. I'm adding some more photos and info to help someone else with install. I used the following: Metra 99-6512 Single DIN / Double DIN Installation Kit Metra 40-EU55 Antenna Adapter (as many have pointed out it...

www.metrisforum.com

And if you do end up figuring out the factory mic connection, please let us all know. You might be able to find some more clues from Sprinter forums.

 

I looked at the factory mic in the control panel, and that connection alone seemed very difficult to remove without breaking.

......

And if you do end up figuring out the factory mic connection, please let us all know. You might be able to find some more clues from Sprinter forums.

Sorry for being a noob, but what do you mean "control panel"?

Yeah, I'll keep digging, it bugs me.

 

Did you manage to connect this head unit?What are the pros and cons?Is it worth buying to replace a original head unit?

 

Hey i dint know if you still interested in finding out or found the solution but i was in the same situation and you can connect the stock camera. On your unit you have to go into back camera settings and change the camera type from ADHD to cvbs and your stock is gonna start working. But mine has an image with distortion now just keep in mind your prob. gonna be the same