 Putting a used module in with no other modules replaced I don't believe will work because we have done that ourself. We ended up putting in the same system with the Bosch Siemens controllers, we ended up putting four modules in in a Mercedes, which is almost identical the way it's set up, in order to make this work because we put the four used modules in that all matched each other and then did some programming with the key, but we got it to work that way. But we could not do it with one