Fob programming

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sctechsys
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Joined: 08 Dec 2018, 14:44

Fob programming

Post by sctechsys »

Hi all

New to the forum.

I have a 2002 Picasso 2.0 HDI with one key, its the manual key with 4 way blade and blue transponder chip. This is all I have.

Looking on ebay I can grab one of these for £20 or so.

https://www.ebay.co.uk/itm/CITROEN-SAXO ... rk:32:pf:0

is there a way to program it to the car? Obviously its only the fob, thats the only bit I need. I dont need another transponder coder as its already in my key.

Quick edit: my key has no buttons, it is the manual door lock type.

Thanks in advance for any info.

Kind Regards
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GiveMeABreak
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Re: Fob programming

Post by GiveMeABreak »

It depends on what you want to do with it.

If you are not fussy about the remote locking and unlocking and put your transponder chip into the new fob with your original key then that's all you need to do. Just don't expect to use the buttons for remote locking / other functions.

If you want remote locking to work, you need to ensure the frequency, the circuitry and transmission protocols are identical, or you'll end up with a glorified key holder.

If you pop your VIN up here, I'll be able to determine the proper fob part number and frequency. But there are a lot of cheap fobs on the market and we've had countless posts where these don't work. If this Fob contains a transponder, you can always code it to your vehicle with a Lexia or as said previously, replace with your own transponder chip.
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

GiveMeABreak wrote:
08 Dec 2018, 15:09
It depends on what you want to do with it.

If you are not fussy about the remote locking and unlocking and put your transponder chip into the new fob with your original key then that's all you need to do. Just don't expect to use the buttons for remote locking / other functions.

If you want remote locking to work, you need to ensure the frequency, the circuitry and transmission protocols are identical, or you'll end up with a glorified key holder.

If you pop your VIN up here, I'll be able to determine the proper fob part number and frequency. But there are a lot of cheap fobs on the market and we've had countless posts where these don't work. If this Fob contains a transponder, you can always code it to your vehicle with a Lexia or as said previously, replace with your own transponder chip.

Certainly Ill grab my VIN for you.

My key is the key type with no buttons - So Its not like I could even transfer the internals into a key like my wifes, I just want the fob for remote locking unlocking and on my model of citroen I believe the fob was seperate to the key anyway.

Ill go grab my vin.
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

VF7**************[VIN obfuscated, can be read by forum staff]
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

GiveMeABreak wrote:
08 Dec 2018, 15:09
It depends on what you want to do with it.

If you are not fussy about the remote locking and unlocking and put your transponder chip into the new fob with your original key then that's all you need to do. Just don't expect to use the buttons for remote locking / other functions.

If you want remote locking to work, you need to ensure the frequency, the circuitry and transmission protocols are identical, or you'll end up with a glorified key holder.

If you pop your VIN up here, I'll be able to determine the proper fob part number and frequency. But there are a lot of cheap fobs on the market and we've had countless posts where these don't work. If this Fob contains a transponder, you can always code it to your vehicle with a Lexia or as said previously, replace with your own transponder chip.

Vin above thanks Marc
sctechsys
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Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

hopefully the ebay item matches up to the part number.
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GiveMeABreak
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Re: Fob programming

Post by GiveMeABreak »

Ok, so there are 2 types of fob for this year / model of your Xsara Picasso. You have the following type:

Citroen Part Number: 6490L8
Transponder: ID46 - PCF7936
Frequency: 433 Mhz
Picasso Fob.PNG
Picasso fob B.PNG
Picasso fob B.PNG (49.4 KiB) Viewed 324 times
Official Fob TypeSimilar Fob Types
Be careful - and do not simply look for the fob design as that means nothing these days due to aftermarket suppliers copying parts.

What is important is that for your Picasso, which was built in March 2002 it that part number 6490L8 is used, as after 2002 they changed the car's electronic architecture and a new type of design was used with a different part number (6554RF).

So although the Transmitter frequency and transponder chips may be the same, the circuitry used to send the signals for the remote locking and other functions may not.

Here's a link to a supplier:

http://www.car-keys-online.com/product/ ... -2002.html
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

ok thanks for that.

so its the key type fob I need like the one my wifes Picasso has? she has the 2 button plip key.
Will this one work?

The listing says not!

https://www.ebay.co.uk/itm/New-Genuine- ... :rk:4:pf:0
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GiveMeABreak
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Re: Fob programming

Post by GiveMeABreak »

Yes that is the one on the listing above. Ignore eBay sellers, they are often wrong. That is the correct part number and that looks to be a genuine one in Citroen packing with the correct part numbernI quoted.
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

GiveMeABreak wrote:
08 Dec 2018, 16:16
Yes that is the one on the listing above. Ignore eBay sellers, they are often wrong. That is the correct part number and that looks to be a genuine one in Citroen packing with the correct part numbernI quoted.

Thanks mate, so If I purchase that how do I program it ?
sctechsys
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Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

Marc, is it a main dealer job to get it programmed?

Thanks
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GiveMeABreak
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Re: Fob programming

Post by GiveMeABreak »

You need a LEXIA to programme it to the car if you are going to use the new fob's transponder.

Citroen can do it for you - but will charge a fee. There are members here with Lexia kits that offer their services for members.

Have a look at the post here:
viewtopic.php?f=19&t=56452

At the bottom is a link showing the list of members on a Google Map. Contact them via the private message system, but please bear in mind that messages will stay in your OUTBOX until they have been read my the recipient - it doesn;t mean they have not sent. Secondly, please bear in mind that not all members are active all the time, so there may be a delay in responding.

Good Luck. :wink:
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

GiveMeABreak wrote:
08 Dec 2018, 17:16
You need a LEXIA to programme it to the car if you are going to use the new fob's transponder.

Citroen can do it for you - but will charge a fee. There are members here with Lexia kits that offer their services for members.

Have a look at the post here:
viewtopic.php?f=19&t=56452

At the bottom is a link showing the list of members on a Google Map. Contact them via the private message system, but please bear in mind that messages will stay in your OUTBOX until they have been read my the recipient - it doesn;t mean they have not sent. Secondly, please bear in mind that not all members are active all the time, so there may be a delay in responding.

Good Luck. :wink:

Thanks but im confused, I wont need the transponder will I because I wont be using it to start the car - only to lock and unlock the car???

So do I still need a lexia?
sctechsys
Posts: 13
Joined: 08 Dec 2018, 14:44

Re: Fob programming

Post by sctechsys »

so the buttons will only be used to lock/unlock... buttons would be external to the actual key, id have to have both on my keyring but thats not an issue... so how would one program just the fob?
RichardW
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Re: Fob programming

Post by RichardW »

It should be possible to synchronise the fob without Lexia, just by turning on the ignition with a coded key, and then pressing the lock (or unlock, not sure which) button on the fob.