Circuit/System Description
WARNING: This page is about a different car, the 2020 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages.