hmm........interesting suggestion, but my understanding is that the master for the entire constellation is the CAN Gateway. So, when the CAN Gateway sees that the identity of a module in the constellation is not the same as in the previous ignition cycle, the "offending unit" is instructed by J533 to go into mode.
This suggests that a error might not be an EEPROM state in the new module - but rather it might be an instruction from the CAN Gateway which persists until the identity of the new module is correctly registered in J533 (as being the identity of the new module that the CAN gateway saw at the previous ignition cycle) - maybe?
I've heard that some third party suppliers have managed to remove errors from their units - so I had assumed that these devices simply don't recognize the instruction from J533 - but I'm guessing!
Don
Interesting... I have not heard of these "" suppliers per say, unless there is a more up to date thread. That being said, even if the instruction set is being issued from the GW (J533), the unit itself goes into some shut down / protected mode... Which to me, indicates something must have changed on the UNITS EEPROM.
Previously, I was able to successfully do an EEPROM comparison of 2 different comfort modules/IMMOs on a 2010 CC which had been upgraded with a 2013 J533 and a dash retrofit. Unfortunately changing the gateway alone caused a plethora of other errors, including an ELV error that prevented the steering wheel to lock. However, I was able to determine that there was a 1 pin wire difference that needed to be corrected between the original ELV and the new comfort module.... But, how could you adapt a new to an older car? I took to the EEPROMs of both units and isolated the HEX values that contained the Immobilizer information. I then took that piece of code, and replaced it on the new .
This resulted in a perfect adaptation of the keys and original functionality of the car blended with new functionality of the without errors. I documented this on the vwvortex forums.
I would suspect (although I have no way of testing) that the same basic principles could apply in this scenario having the proper J533 installed.