✵ Use a multimeter to check for ohm resistance. (This can be difficult to identify because the bus is often noisy.) ✵ Use a multimeter to check for a 2.5V baseline voltage. CAN wires are typically two wires twisted together. (See Chapter 2 for common locations of the OBD connectors and their pinouts.) If you don’t have access to the OBD-II connector or you’re looking for hidden CAN signals, try one of these methods: If you have access to the OBD-II connector, your vehicle’s connector pinout map should show you where the CAN is. Of course, before we can reverse the CAN bus, we need to locate the CAN. It can take a long time to grasp the information contained in these packets, but that knowledge can be critical to understanding the car’s behavior. The rest of the nondiagnostic packets are the ones that the car actually uses to perform actions. Instead, we’re interested in accessing all the other packets that flood the CAN bus. That said, we don’t need to be able to access the official diagnostic CAN packets because they’re primarily a read-only window. In order to reverse engineer the CAN bus, we first have to be able to read the CAN packets and identify which packets control what. The Car Hacker's Handbook: A Guide for the Penetration Tester - Craig Smith (2016) Chapter 5.
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