My car uses Can2a, the identifier is 11 bit, and is a combination of which module is transmitting, and what type of data, each module has a range of identifer adresses, I've been able to find some of the ones for the instrument cluster & some of the dash switches, the bus also seems to use remote frames.
I want to be able to take over the driver information display.
I managed to find the identifier for the speedo/tach and fuel/temp guage, its hex281 followed by 8 bytes of hex & bit encoded data.
Theres a good chance I'll need 2 can inetrfaces, and intercept the data I want to manipulate and re-transmit it modified.
Yes I've already got a code reader, and fiat software for all the vehicles modules.