E class retrofit is not for the faint hearted,you have to tap into the rear sam and audio gateway,which are both at the left hand side of the boot.
you then need to run the wires to the front of the car and wire into the can bar under the glovebox,then wire into the back of the command,I can supply instructions for this,but you need to know what you are doing.
you then need to run the wires to the front of the car and wire into the can bar under the glovebox,then wire into the back of the command,I can supply instructions for this,but you need to know what you are doing.