No offense man, but is this your first car stereo install? Because DMP has been nothing but Nice and super responsive to me in every case, I'm about to order the 12.3" Android Screen for my 2014 c300 Benz Sport W204 NTG 4.5 , and Add a backup camera. I've watched about 15 different install videos and so far you are the only one who has had an issue with yours, I do know if you have the Harman Kardon Sound Package which is part of your original Harness, and you bend those wires and they get even slightly damaged it will cause a lot of issues , and very poor sound, you will have to replace the whole harness that goes through the car and that's a pain , and your looking at BIG BUCKS. But let me know what that little device is you ordered, just in case I may need one, I live in Ohio, but I used to do Car Audio installs on the side, so I'm fairly familiar with wirering up stuff. But why would you delete comments on your other video when people could have offered you help? That looks fishy to me though.... u know?
The screen shouldn't even be on with ignition off you have a problem with wiring harness why don't you message Daniel at DMP I have just finished fitting nine and everything is working fine
Other than replacing the unit dmp can't do much to help u, remember they just a resellers, they never manufactured or designed this screen, they just get em from Chinese suppliers, repackage it then sell it for marked up price, so i just saved the money and got my screen straight from Ali express, i suggest u take ur car to local shop who install this type of screens to take a look at ur car wiring, there is a shop called 4x4 somthing forgot the exact name 😅, have RU-vid channel with multiple installations videos for benz screens i forgot if they located in USA or Canada, try to contact em and see how much they will charge u for checking it out.
