remote locking not working after lexia keys procedure

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My Name: mrvirtual

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Posts: 2
Joined: Sat Aug 13, 2016 9:00 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (54)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 130000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

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I have the recover key (key1) and a key that I usually use with remote control to open and close the car remotely (key2).
I threw the transponder from the key2 by accident because I changed the shell.
I bought a new transponder.
I went to a Citroen garage to ask for a key cloning. NOTE: the remote locking was fully working even at long distances.
They started the procedure with the Lexia software and the 2 keys now are working because the car starts (no immobilizer).
Unfortunately the remote locking and opening is not working anymore. They tried the procedure many times without success. I too tried with many variations, with the door close, waiting 10 seconds, then waiting 1 minute closed in the car until the relay makes the sound, exiting and locking not remotely. No way . I don't know what to do.

Is there anyone who knows why?
Thanks
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Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
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mrvirtual wrote:I have the recover key (key1) and a key that I usually use with remote control to open and close the car remotely (key2).
I threw the transponder from the key2 by accident because I changed the shell.
I bought a new transponder.
I went to a Citroen garage to ask for a key cloning. NOTE: the remote locking was fully working even at long distances.
They started the procedure with the Lexia software and the 2 keys now are working because the car starts (no immobilizer).
Unfortunately the remote locking and opening is not working anymore. They tried the procedure many times without success. I too tried with many variations, with the door close, waiting 10 seconds, then waiting 1 minute closed in the car until the relay makes the sound, exiting and locking not remotely. No way . I don't know what to do.

Is there anyone who knows why?
Thanks
You don't clone a new immo chip. You need to pair a blank immo chip to the car, but this bit seems to work, so that is not a problem.

The remote central locking is not connected to the immo chip procedure.

If you have tried the procedure to 're-pair' the central locking keys (you need to do all the keys in one session)....

The procedure is HERE (click)

... and its still doesn't work, you have a faulty key remote board and it needs to be repaired (if its switches at fault) or a whole new unused board fitted :(
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My Name: Missing Lincs

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Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.1
Fuel Type: Petrol
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
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You can't replace just the transponder chip from a key, you will unfortunately need a new key minus the blade. Citroen sell the key in this form.

The remote locking board code is pre-written into the transponder chip, when the transponder is paired with the car it also registers the remote locking board.

The way C3 keys are programmed you have to re-install all the keys when you carry out the pairing, no old information is retained, so if you've lost the old transponder you will also have lost the use of the central locking board that was in the same key.

Be aware of the generic keys offered on ebay, they may be genuine Valeo keys but unless they have the central locking code pre-installed they will only work as a key, no locking function.
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
My Name: mrvirtual

Member
Posts: 2
Joined: Sat Aug 13, 2016 9:00 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (54)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 130000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

Post

Thanks all for your explanations. There's one thing that I still have to understand. Before the procedure with the software one of the keys was fully working, so the transponder was in possess of the right code, both for the immobilizer and both for the remote control. As I understand from your explanation the procedure of the software (I checked the name and it is DiagBox not Lexia) has erased the chip and charged only one code (that sounds me crazy and harmful). If I buy a new key the procedure will erase also the new transponder. So what's the right procedure in the Software?
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My Name: C3CAR

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Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
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mrvirtual wrote:(I checked the name and it is DiagBox not Lexia)
No, for your Year: 2004 (54) C3 you should use Lexia.
My Name: Missing Lincs

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Posts: 844
Joined: Mon Mar 05, 2012 9:29 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.1
Fuel Type: Petrol
Trim Level: Desire
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Location: United Kingdom
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mrvirtual wrote:Before the procedure with the software one of the keys was fully working, so the transponder was in possess of the right code, both for the immobilizer and both for the remote control. As I understand from your explanation the procedure of the software has erased the chip and charged only one code (that sounds me crazy and harmful). If I buy a new key the procedure will erase also the new transponder. So what's the right procedure in the Software?
When a new key is programmed all existing keys are removed from the system. Existing keys are re-learned as part of the programming.

Whoever is doing the programming must have all the keys for them all to be registered.

I too find this worrying, if the programming fails you end up with a car and no working keys!

I also find it worrying that many C3s only ever had one fully functioning key, they were sold without a spare. Ours was like this, hence my research into key programming and adding a second fully functioning (starting and remote locking) key.

Incidentally, I did try pre-programming a transponder chip with the remote locking code and failed. You can 'read' an existing transponder but the method of encryption is far beyond manual deciphering. Without detailed knowledge, which will be closely guarded by the manufacturer, it's impossible to do. Even dealers don't have access to information at this level, they just order the key from Citroen.
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
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