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CEM and key barcode

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Old Jun 10, 2022 | 09:08 AM
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CEM and key barcode

Hi!

I would dearly appreciate some expert advice!

I recently purchased a 2014 Aston Martin RapideS in Dubai. The dash lit up like a Christmas tree, as a result I need a new CEM module which is under AM warranty.

Once the CEM is replaced, AM are saying they need the keys “barcode” to recalibrate the keys to start the engine. I don’t have this, nor does the previous owner so AM asking me to replace both keys (at great expense!). Below is an example of the code.

My question, shouldn’t AM have a copy of the barcode? They are saying they don’t which doesn’t sound correct… my AM agent is lovely but doesn’t seem overly sure when quizzed.

Sincere thanks in advance!



 
Old Jun 10, 2022 | 09:57 AM
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Usually original stickers with bar codes from the keys programmed are placed in the owners's manual (this is a good practice in the automotive industry). If they are not, then AM cannot help as they do not keep any records for security codes, so your AM dealer is right. You need new keys ... or you need to reflash your new CEM with original CEM software where your old keys are stored (however this cannot be done by AM as it needs low level programmer's skills).
However, if your CEM is under warranty, I would expect AM to replace your CEM with fully functioning CEM, e.g. with working keys.
 

Last edited by chrzesm; Jun 10, 2022 at 10:00 AM.
Old Jun 10, 2022 | 01:37 PM
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Those codes have nothing to do with starting the car, that's a remote only thing. But regardless you need new keys to have all functions of the ECU.
 
Old Jun 12, 2022 | 04:32 PM
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Originally Posted by J doubleU
Those codes have nothing to do with starting the car, that's a remote only thing. But regardless you need new keys to have all functions of the ECU.
Yes and no. As the remote and key are one integral unit not available separately, I would not be surprised if the transponder/handshake for both remote and start authorization utilize the same code. For example, you cannot take a Volvo key head and program it to another car. Without those barcodes, the keys become paper weights in relation to a new CEM. Given everyhting else of this period, I',m assuming this is all Volvo hardware and software based.

OP, you need the CEM, but the onus is on the dealer/AM warranty to eat the keys that go with it since the repair offers you no recourse. Let's also not forget where the h*ll is the goodwill towards a new customer?!?
 
Old Jun 12, 2022 | 05:58 PM
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J DoubleU is correct, they are two totally separate things. On the models with the ECU there is a little black chip stuck to the remote cover which is queried by the car to allow it to start. That can be linked to the car by inserting and removing two already linked fobs then putting the new one in. I have just added a plastic fob to my 2011 Virage by doing that.

The lock/unlock function is controlled by the main circuit board and that is what the code is associated with.

 
Old Jun 12, 2022 | 06:06 PM
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Originally Posted by a102768
J DoubleU is correct, they are two totally separate things. On the models with the ECU there is a little black chip stuck to the remote cover which is queried by the car to allow it to start. That can be linked to the car by inserting and removing two already linked fobs then putting the new one in. I have just added a plastic fob to my 2011 Virage by doing that.

The lock/unlock function is controlled by the main circuit board and that is what the code is associated with.
Ah hah! The more you know... 👍🏻
 
Old Jun 12, 2022 | 07:26 PM
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CEM change does require a key, meaning reprogram of the start function. Unfortunately if you don't have the seed codes for the previous CEM that was already fitted there is no remote function.
 
Old Jun 13, 2022 | 02:49 AM
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Originally Posted by J doubleU
CEM change does require a key, meaning reprogram of the start function. Unfortunately if you don't have the seed codes for the previous CEM that was already fitted there is no remote function.
... or you can clone CEM by flashing new CEM with the old one's content. This can be done by touching the chipset directly with a dedicated programmer. Only this way the old keys will work w/o codes.
 
Old Jun 13, 2022 | 12:47 PM
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Sounds involved, probably should try a sheep first.
 
Old Jun 13, 2022 | 01:26 PM
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Originally Posted by chrzesm
... or you can clone CEM by flashing new CEM with the old one's content. This can be done by touching the chipset directly with a dedicated programmer. Only this way the old keys will work w/o codes.
Right, but this would be a solution found outside the dealer network in the aftermarket ?
 
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