What terminals do high-speed CAN BUS communicate through with a scan tool?

High-speed Controller Area Network (CAN) communication facilitates robust data exchange between vehicle components and diagnostic tools. In the context of connecting a scan tool to a vehicle’s diagnostic port, the standard terminals utilized for high-speed CAN BUS communication are specifically terminals 6 and 14.

Terminal 6 is linked to the CAN High (CAN H) signal, while terminal 14 connects to the CAN Low (CAN L) signal. This configuration allows the scan tool to send and receive messages using differential signaling, which enhances noise immunity and allows for high-speed communication across the vehicle's electrical architecture.

Understanding the correct terminal connections is vital for effective diagnostics and communication with a vehicle’s electronic control units (ECUs). This connectivity ensures that data related to engine performance, vehicle speed, diagnostic trouble codes, and other parameters can be accurately transmitted and analyzed by the scan tool.

Other terminal combinations provided do not correspond to the standard high-speed CAN BUS communication layout defined in the OBD-II specifications. Hence, they cannot be used for the proper communication required for diagnosing or interfacing with modern vehicle systems effectively.