From what I can see with the 38 pin Benz adapter for my Maxi Sys Pro , is the male terminal end of the cable from the MaxiFlash Elite VCI just plugs into the female 16 pin end of the 38 pin Benz adapter.
In the event the Maxi Flash Elite doesn't power up KOEO , then you need to plug the 12 volt power supply cable with the battery clips or lighter adapter into the Maxi Flash Elite or VCI in order for it to have 12V to power up. Not sure it be same with a Maxi Scan