Circuit/System Description

The high voltage energy management high speed GMLAN serial data circuits are serial data buses used to communicate information between the hybrid powertrain control module 2, the battery energy control module, and the battery charger. If this serial data system is inoperative the control modules will not communicate with each other on this bus, but they still communicate with the scan tool through high speed GMLAN bus.

The scan tool does not communicate with control modules through the high voltage energy management high speed GMLAN bus. The high voltage energy high speed GMLAN serial data circuits connect directly to the auxiliary data connector and do not connect with the scan tool.