Data Communications

The infotainment system communicates with other devices on multiple serial data networks during operation.

Media Oriented Systems Transport (MOST) 

At the core of the infotainment system is the Media Oriented Systems Transport (MOST) bus, a high-speed multimedia network technology. The serial MOST bus uses a ring topology and synchronous data communication to transmit audio, video, data and control information between any devices attached. The MOST bus uses a dual wire structure to communicate among these devices.

A MOST communication enable circuit is also connected to all components on the MOST bus. The MOST enable circuit is used to wake the network and trigger network diagnostics. Any component on the MOST bus may assert the enable circuit, but communications are initiated by the MOST bus master.

The MOST bus master is the device responsible for normal wake up and initialization of communication on the network. The MOST bus master receives vehicle power state information from the vehicle power mode master. The MOST bus master uses this information to control the power state of the infotainment system.

The MOST bus master is also responsible for maintaining known good network configuration. The MOST bus master will be the device that reports MOST bus errors/DTCs.

The Remote Radio Receiver, Human Machine Interface Module, Remote Optical Drive, Audio Amplifier and the Instrument Panel Cluster all communicate on the MOST bus.

Local Interconnect Network (LIN) 

The Local Interconnect Network (LIN) Bus is a single wire communication system. This bus is used to exchange information between a master control module and other smart devices which provide supporting functionality.

The Remote Radio Receiver, Human Machine Interface Module, Information Display, Infotainment Controls and the Multifunction (tunnel) Controls all communicate on the LIN bus.

GMLAN 

The Remote Radio Receiver, Audio Amplifier, and the Human Machine Interface Module communicate with other components and systems in the vehicle via GMLAN.