Circuit/System Description
WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
Certain modules communicate with a scan tool via the keyword 2000 serial data circuit. The keyword 2000 system is for diagnostics of those modules only. There is no communication between any other modules on the keyword 2000 serial data system.