opendbc VS erc-calculator

To help you get started, https://github.com/commaai/opendbc have a few Nissan vehicles with defined CAN bus IDs and the scale/offset.

Here is a good starting point for you...there are 3 Kia DBCs here: https://github.com/commaai/opendbc

The trick is finding that message... this DBC file may help: https://github.com/commaai/opendbc/blob/master/mazda_3_2019.dbc

As for the packet encoding, there's some open source info here: https://github.com/commaai/opendbc Another place to look is the RaceCapture Pro user community, as they map out CAN broadcasts for various cars and share it.

This is a really handy list of unofficial dbc files - there are a few Hyundai Kia ones in there so should be a good start. https://github.com/commaai/opendbc

There is a growing database of CAN messages for different vehicles here: https://github.com/commaai/opendbc

Luckily for me there is a lot of data to build on top - there is https://mdac.com.au/2021/04/11/dsg-control-with-rabbit-ecu/ article, there is https://github.com/RabbitECUProject/RabbitECUTeensyMCUXpresso/blob/main/source/Client/DIAG.c source code of how RabbitECU solved the same problem, and there is a https://github.com/commaai/opendbc/blob/master/vw_golf_mk4.dbc

What vehicle is that? Did you decode CAN packets or found information on the internet? Do you have any new CAN DBC knowledge to contribute say into https://github.com/commaai/opendbc which seems to be the largest catalog of DBC files?

On a related note, factory-installed Toyota display systems can sometimes be locked and require an "ERC" code to unlock. The display in my recently imported car was in Japanese and seemed to be stuck, as none of the buttons or rear camera worked. I learned from Google Translate that it was in some kind of anti-theft lock mode, and after going down the rabbit hole I found out that I could access a secret menu by holding radio power and turning the headlights on and off three times, which revealed a screen displaying the display's serial number and asking for an "ERC" code.

It turns out some fine Internet people have written C# (https://github.com/alexeyfadeev/erc-calculator) and Python (https://github.com/Berks/python_erc) packages to generate these codes. Was really cool to figure this out without having to pay some shady site in Bitcoins! The display is still in Japanese, but at least I can use Bluetooth and the rear camera! Hope that helps someone.