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I don't think you can pull a DBC file off of a vehicle. I think you have to build the DBC file yourself by reverse engineering everything--you'd monitor the CAN network, and then turn the light on and off, sit in the driver set, etc. The DBC file is the car's secret sauce.

There's also at least one repo [1] of DBC files that have already been reverse-engineered by the community

[1] https://github.com/commaai/opendbc

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