October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Circuit/System Description

The high speed GMLAN serial data circuits are serial data buses used to communicate information between the devices. If this serial data system is inoperative, some devices may still be able to communicate with the scan tool due to other serial data systems but not with each other.