Smart 451 Programming

[craigeyboyz]

Evening All,

I've got a Smart 451 used key with a PCF7941 new virgin chip on. As I do mostly 450 keys which can be simply reprogrammed to any car these ones obviously need a new transponder on to even start. Originally I thought I could just use DAS to program this new transponder in but no dice!

I've searched and learned alot from here and other places but I'm hoping someone can fill me in the blanks so I can put this to bed.

As I understand it, since I've replaced the chip....I need to pre-code the transponder before using DAS to code it. Bearing in mind all I do is Smart cars so I only use DAS but I'm happy to buy something that can do the pre-coding if some can explain what I'll need to do to get them to work in DAS.

Finally I'm getting the idea that even with this done, the best I'll get is a coded key but the remote won't work. Is that still the case now? Is there anything I can clone from a new key from MB or anything? Or do MB supply a new key that's already got the coding on for the VIN or something

Really appreciate the help

[autofan1965]

You cant precode blank pcf7941. Remote should learn itslef durning key learning.

[simaservis1108]

Hello,

You can't reuse the key like that,because the PCF7941 must be eeprom programmed,then prepared with transponder and remote data.
You can't read eeprom contents on the locked key,hence you can't rewrite to new key.

Regards,
Sima

[craigeyboyz]

You cant precode blank pcf7941. Remote should learn itslef durning key learning.

Tried that but wouldn't play. Like simaservis1108 says I was missing the pre-programming but sounds like I can't even clone a key!

Is it not even possible to get the immo side to work even without remote programming?

Thanks again

[craigeyboyz]

http://www.digital-kaos.co.uk/forums/f178/smart-fortwo-2008-keys-lost-376194/

What's the result here then if he can read the eeprom from the SAM unit? Can that info be used to flash the new PCF chip?

[paul_12345]

http://www.digital-kaos.co.uk/forums/f178/smart-fortwo-2008-keys-lost-376194/

What's the result here then if he can read the eeprom from the SAM unit? Can that info be used to flash the new PCF chip?

you can not get the remote working at all on a new chip. you could get the immo side working with the correct precode

[craigeyboyz]

you can not get the remote working at all on a new chip. you could get the immo side working with the correct precode

Cheers Paul that clears it up. How do keys from MB work then? Precoded and setup for remote when they get sent?

[autofan1965]

I advice you to start basics.

[bearheroes]

almost 5,5 years, 5 posts and you ask for that info???
even if someone knew that info do you think that would share for free???

[audiomeca]

Buy new original keys from dealer, is the one option a this time for code a key in this car ,and all run , start and remote function, you can buy one not original precode transponder , but not remote open run!!!!

You can code a new key with xentry if have the MASTER KEY if not only avdi can add more keys a this car

regards

[streetlegal]

craigyboyz

do you know how convert mech keycode from mcc0995 to a proper set of cuts eg 3244123321 as instacode will not recognise the keycode

[craigeyboyz]

craigyboyz

do you know how convert mech keycode from mcc0995 to a proper set of cuts eg 3244123321 as instacode will not recognise the keycode

Sorry no, I don't get involved with key cutting

[pauliuse30]

with new xentry dont need master key ;)

[martin1234]

easy you can do it with das, you dont need new exentry as this is done through das , and its a offline job, easy,

[dekimin]

xtool,x100pro do easy...

use china remote key ok