Here is the pinout MCU for ezs w639 year 2012 for Xhorse multi prog 0L01Y MC9S12DT256CPVE.
If Multiprog only has a diagram directly for the MCU, you may enter the wrong menu.
EZS pinout for Multiprog.
If we are talking about EZS Mercedes. You need to select the Immo tab in the device selection, then select Benz and choose the required EZS model from the menu that opens.