Can a previously learned key transponder be relearned?

[jmanis2]

So this seems to accurately describe where I'm at today, but the dealer is stating that once a key is deleted from memory it can't be readded. This is not stated or implied by the user's manual and I have a hard time believing it. Digging further I read through the Maserati Academy Advanced Electronics 2 manual and found this list of functions performed by the Body Computer and one of them is controlling a list of permanently disabled codes but it doesn't describe how a code becomes permanently disabled.

FIAT CODE function in the NBC (Body Computer)​

The main functions of FIAT CODE are:

• Deactivate the alarm system after recognition of an enabled transponder (NBC)
• Energise the antenna to read the transponder in the key
• Receive the cryptographic code emitted by the transponder
• Store the secret NBC code
• Control a list of maximum 8 enabled NBC identifiers
• Control a list of permanently disabled NBC identifiers
• Control the C-CAN line to the engine ECU (NBC)
• Control activation of the warning light on the instrument panel by communicating with the NQS
• Perform NBC diagnosis

My questions:
- Does anyone know if it is impossible to re-record a previously enabled key in the system?
- Does anyone know what transponder chip is used in the 2006 Coupe key fob? If the old one is not recoverable I'd rather replace the transponder in the key and then add it in as a new key.

Jeff

2006 Coupe Cambiocorsa (Euro Spec)

 

[CatmanV2]

I guess it's possible, but it seems an odd thing to have.

C

 

[CatmanV2]

Just going to copy in my ML response and the observation that if the transponder from the faulty key has been lost or come loose, it may account for the failure to add it to the NBC

By a second hand key from ebay and swap the transponder or blade?

But per my reply to your slightly different post on SM, this seems very odd. You've also phrased it slightly differently here:

"The codes of any keys that are not available when the new storage procedure is carried out will be deleted from the memory to prevent any lost or stolen keys being used to start the car."

Also, now I'm a bit more awake, the manual seems to be rather wrong (at least for a coupe / GS / Spyder) (Or maybe badly translated)

The transponder has nothing at all to do with the alarm (at least in the sense of what I understand a transponder to be, and random dictionay lookups agree with me.) That's controlled only by the radio transmitter in the key fob. I'm not even sure that there is a link between the NBC and the alarm system whatsoever.

The NBC *does* read the transponder in the key, check it and provide PTS to the ECU though. I still can't see why you'd want to permanently exclude (let's not say delete) a transponder from the system, and I suspect what the manual is trying to say is that when you program keys, you need to do them all, you can't just add a new one. This tallies with what I know from having bought new keys for both my Alfa GT, my Coupe and my Maserati GT where *all* the keys were needed to make sure both new and old were added.

Not sure this helps, but my suspicion is you'd be better off with a decent indy.

C

 

[jmanis2]

Just going to copy in my ML response and the observation that if the transponder from the faulty key has been lost or come loose, it may account for the failure to add it to the NBC

By a second hand key from ebay and swap the transponder or blade?

I'm looking for a used key, going rate on ebay at the moment is like 60$. As I only want the RFID chip I was hoping that I might find a better deal/

"The codes of any keys that are not available when the new storage procedure is carried out will be deleted from the memory to prevent any lost or stolen keys being used to start the car."

This is the exact wording in the user manual: https://www.manualslib.com/manual/680663/Maserati-Coupe.html?page=76#manual

The transponder has nothing at all to do with the alarm (at least in the sense of what I understand a transponder to be, and random dictionay lookups agree with me.) That's controlled only by the radio transmitter in the key fob. I'm not even sure that there is a link between the NBC and the alarm system whatsoever.

The transponder I refer to here is the RFID chip related to the immobilizer and not the circuit boards related to the alarm. On a side note: As for a link between the two systems according to the Maerati Academy technical descriptions the alarm is supposed to be deactivated if an enabled key is used to start the car. This is not the case with my car and per several others' forum posts it doesn't appear to be the case for them either. There are country specific differences in alarm behaviour so perhaps a US spec is different than German.

The NBC *does* read the transponder in the key, check it and provide PTS to the ECU though. I still can't see why you'd want to permanently exclude (let's not say delete) a transponder from the system, and I suspect what the manual is trying to say is that when you program keys, you need to do them all, you can't just add a new one. This tallies with what I know from having bought new keys for both my Alfa GT, my Coupe and my Maserati GT where *all* the keys were needed to make sure both new and old were added.

You and I have the same opinion as to what would make sense, I can't see the logic in adding a previously enabled code to the permanently deactivated list. Deleting it from the enabled list would serve all protection requirements. Hopefully someone has first hand experience in removing and readding a key to their car.

 

[CatmanV2]

I reckon this is badly translated. The alarm (and central locking) is controlled by the RF transmitter in the fob. The immobiliser is controlled by the transponder. The two systems are not connected (as you you've demonstrated, no matter the difference of countries)

I'll stick with my recommendation(s). Open the faulty key, check the chip is present and in the correct place. If it is take it to AV or someone similar.

Or per the Keyphobes thread, you might try Timpsons....

C