Ahhh OK... where did you get the spare electronics to use?
same place
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im pretty sure the modulation is fsk.
if you have the pin code you can program through lexia3. If not a dealership can give you the the code for £20, or you can try and find a tool like obdstar or xtools to get the code and program it. Im still fiddling around, i will let you know if i figure it out