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post #4 of (permalink) Old 5th March 2008
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i got the same problem on my espace, i went to the renault dealer yesterday, they ask me to order a new key fob from france, which will cost me 150 pound or 1000 local currency(this is huge number) , a piece. My remote is RF type, the car can start, but i could not open the door remotely. I plan to install an alarm to control the central lock. Does any one know if external alarm affect the car computer board?

by the way, i found a sound explaination regarding the key fob from other forum, the writer claim that he is working for renault.

"There are two main types of immobiliser sytem, the infrared which can be identified by the small glass ball at the base of the black part of the key and the ultrasonic or radio type system. These differ in two ways. The first infrared system relies on the button on the key being pressed to deactivate the imobiliser. The second has a seperate chip and a decoder ring around the ignition barrell and even if the key does not operate the central locking should have no adverse effect on the car starting.

If you have the first system which is the earlier of the two and was phased out around 1998 a good way to check if the key is still operational (even if the red light comes on) is to point the key at a mobile phone camera and you should be able to see blue light coming from the glass ball on the key. If there is no light then the key is usually unsalvageable and would require replacement. If there is light coming out of the key yet it does not start the car it is most likely that the key and the car have gone 'out of sync' and will need to be 're-phased'. On anything other than a megane or scenic it requires the Renault Diagnostic computer to be connected to the vehicle before the key can be rephased.

Over-riding the imobiliser is possible but you will need the imobiliser code which contary to popular belief is avaliable from Renault dealers (usually about 10+vat). Renault UK have issued a document to dealers that authorise them to pass on this information provided you have shown photo id and the V5 registration document (The code is obtained from the chassis number). For a Laguna you will need to use the pedal and wiper stalk method of code entry and for a megane or scenic the code is entered via the central locking button. Immolbilser codes are not inside the key!! The number on the key together with the chassis number when entered into a crypted Renault database then produce an immobiliser code.

If you have the later radio type key there are no 'cheats' to over-ride the system and a diagnostic routine will be the way to go. You could guess and replace coded ring around the steering lock but these rarely give trouble and are often incorrectly diagnosed as the fault.

There is not a design fault with these systems, perphaps what is more of a problem is that inside your key is delicate circuitry that is unfortunatley often over delicate and anything such as magnets, heat, cold, dropping the key or sitting on it could have an adverse effect on it. As such my advice to you all would be to treat your key like gold dust as in 90% of cases the key is the problem rather than the car itself. "
Currently in wkl's garage:
2002 Renaul Espace III 2.0
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