Circuit/System Description
WARNING: This page is about a different car, the 2015 GMC Savana 3500, 2015 GMC Savana 2500, 2015 Chevrolet Express 3500, and 2015 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
The serial data circuits are serial data buses are used to communicate information between the control modules. The serial data circuits also connect directly to the data link connector (DLC).