I am replacing the stock stereo in my 2015 Nissan Leaf S. In the center console is a USB port which was connected to the head unit. I'd like that port to continue to work with my new stereo. The schematics for the existing unit has the following:
The bottom line represents the back of the stereo. Here is the legend for those numbers where the letter under the number represents color of the wire (I don't know what shield means)
The new stereo doesn't have a schematic because the USB port is built into cable that plugs into the unit. It has 4 wires, black, green, white, and red (ignore the yellow, it's for a mic). Here it is:
My first guess is that I would ignore 57 and connect 53 to red, 54 to black, 55 to white, and 56 to green. Is that right? If not what do I do and in either case what is the signal shield?