Key Fob programming?

[Qmulus]

The chips are not readable. It is a very common practice in microprocessors to lock the code, with no way to read the contents. You _might_ be able to erase and reprogram it, but even that is not guaranteed. These are not just EEPROMs, but ICs dedicated to function in key fobs where security is part of the design.

The only way that I can see to reuse a fob is to find the alarm/immo module that the fob was originally used in, find the code for that fob (the data stored is NOT that 16 or however many character long string), and program it into another alarm module. I don't even think locksmith tools have the ability to decrypt these codes. I THINK PST2s will show you the code of the fob currently being used from data received by the alarm module, but I don't know if it will show the code of a fob that is not matched to the module.

The actual key programming (immobilizer) is pretty straight forward. In fact, I have an Audi switch blade key for one of my spares, but I do not have a spare remote/fob for unlocking the car.

[sjg1138]

Does anyone know where I can get the data sheets for the chips that are in the Fobs? I agree with Amagalla in that maybe we can get the code out of a Key Fob. If that can be done, the Fobs will no longer be paperweights. We would still need to goto the dealer with the Fob to have the code programmed into the car's computer, but at least we won't have to purchase new (expensive) key Fobs from the dealer.

I have searched on the Microchip website but can not identify the large chip in the Fob.
It seems like the part number is something like: 025O1Y9 but I am having issues reading it off of the pictures Amagalla took. Can anyone identify the chip and point me to the Data Sheet? With this info I think we can determine whether or not we can get the Code out of the chip.

I have an extra Fob but don't really want to de-solder the battery holder (to see the chip) unless I have a method lined up to try to read the chip.

[sjg1138]

I'm betting it is something like this:
MCS3142 - Security- KEELOQ® Encoder Devices

What model year car is this remote for? Part of the code on the chip could be the year (02) followed by the month (50).

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