Smart 451 '10 reprogram key

[jimware]

Hello.

I bought some months ago one used smart for two 2010 year. The seller gave me one key and after 2 months he send a second key that unfortunately is from another smart. After i asked he said that he has not any other key.
So i have a clone of mercedes diagnostic and when i try to make the teach in function it says that the key is programmed to another car and cannot be done.
I opened the key and they have the pcf7941 transponder. I order new blank transponder from aliexpress to replace it.
Do you thing that its going to work?
Anyone else that make the some or any special instruction to make before replace the transponder?

[keygargoil]

doesnt this year and model have a chip in the key 3 button remote with va2 blade

[keylossio]

pcf7941 ? i am not sure if ur car 2010 dear u cant program a new key model u can program the old key chrome or black but the new key model u cant cause it has not chip inside the key , if u ave pcf7941 maybe ur car it start but the central lock iam not sure anyway plz post the board of ur key i will see it .

[puiu]

I done one key like this with TMPro,you need to read the 9S12 MCU from BCM if i remember correctly

[jimware]

Here is the board.252597

Puiu can you please explain me what you mean i must read th 9s12 mcu from bcm. My skills on that is on medium level...

[puiu]

You need TMPro ,(or maybe is another tool capable to program i don't now)
Here is description from bogie site :
ETACS Siemens-VDO
Memory device is Motorola MCU MC9S12B128 QFP112 package.
Expected file size is 2048 bytes.
Use PCF7936 or Silca T14 - JMA TP12 transponder orremote key.
Written transponder is ready programmed to start car.

[jimware]

Thank you puiu for fast response!!
Unfortunatly this is for the forfour key. Its different from the fortwo.
They have different transponder.

[puiu]

Sorry i tought is same....


Sent from my iPhone using Tapatalk

[wsc]

its same my friend both have PCF7941, car will start but remote will not work

[audiomeca]

Hello

Can put an new vigin PCF7941 transporter in one used key? and code with Xentry, or need a precoded transponder for code?

regards

[westville locksmiths]

Four two , is remote only.

Four Four is remote +chip

[audiomeca]

Four two , is remote only.

Four Four is remote +chip


Not ,fortwo 451 have chip identical to forfour 454

[jimware]

audiomeca this is what exactly i want to know. I have ordered some pcf7941 chips to replace it. After i will try to reprogram with xentry but i believe that it will not work.

For the for four they say that it uses pcf7936 chipset but the fortwo uses pcf7941. The official TMPRO2 site answerer me that they programmer cannot make fortwo keys.

I am little confused.

[keygargoil]

it wont work because your 7941 chips will come blank and you cannot precode them properly thats why tm pro put a notice up in the forum saying if a new key remote will work if used key with new 7941 car will start but remote wont work you can buy these keys from china now they programme straight in with avdi or order one from the dealer

[jimware]

So at this moment the key can virginized only with avdi is this correct?

[audiomeca]

I have avdi and not make virgin this key

[jimware]

So how to do it is the question?? Because some they do it...

[Gizbern]

http://www.digital-kaos.co.uk/forums/f178/smart-car-remote-control-new-pcf7941-279186/#post1614507

[martin1234]

das its easy have you got this type key , you have to use a new unlocked one, you cant recode a used one,
and it can be done in mb start (das ) :coat: