What Is the Difference between Marelli and Delphi of Fiat BSI System?

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Question:
What is the difference, aftermarket Fiat remote, Marelli and Delphi?



1.What is Marelli and Delphi?
Both are Fiat BSI (Intelligent Service Box), but different brands/ models

2.How to know one is Marelli or Delphi?
Resistor allocations for buttons.


3.Can Marelli Convert to Delphi and back?
Yes but not 100%, they can convert to the other system manually.
ID: xxxxx2A,
1)Press these 2 buttons at the same time, don't release the buttons
2)Click this button 30 times, then release the 3 buttons at the same time
ID: xxxxx25,
1)Press these 2 buttons at the same time, don't release the buttons
2)Click this button 10 times, then release the 3 buttons at the same time

To Verify, check if key ID changes. (xxxx25 is Marelli, xxxx2Y is Delphi)

4.How to Generate Remote for Marelli and Delphi?

(pic via Mickey)

e.g. Ducato 2013 Marreli System
It is PCF7946, Marreli Magnetic System, 3 Buttons, SIP22 blade