High Speed Hybrid GMLAN Circuit Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The high speed hybrid GMLAN serial data modules do not communicate directly with the scan tool. The SDGM communicates on all serial data busses and relays the high speed hybrid GMLAN serial data information to the scan tool. The high speed hybrid GMLAN serial data bus operates the same as the high speed GMLAN bus with the exception of the need of the SDGM for communication between the modules and a scan tool.