Is it true that High Speed CAN data bus networks can operate on a single copper wire if a short occurs in either the CAN Hi or CAN Lo network wires?

High Speed CAN (Controller Area Network) data bus networks are designed to operate using a twisted pair of wires, typically referred to as CAN High and CAN Low. This design enables effective communication between various automotive modules while minimizing electromagnetic interference.

When a short circuit occurs in either the CAN Hi or CAN Lo wire, the communication can be disrupted significantly. High Speed CAN relies on the differential signaling between these two wires: CAN Hi typically carries a higher voltage than CAN Lo. If one of these wires is shorted, the ability to maintain the required voltage levels and the necessary differential between them can be compromised, leading to faulty or non-existent communication.

Thus, a High Speed CAN network cannot operate correctly on a single wire if a short occurs, as the fundamental principle of differential signaling is violated. The network thus requires both wires to be intact for proper operation. This understanding is critical for troubleshooting issues in automotive communication systems.