What does GMLAN refer to in the context of vehicle module communication?

GMLAN stands for General Motors Local Area Network, which is a communication protocol utilized in vehicles produced by General Motors. It is primarily based on the Controller Area Network (CAN) architecture, specifically the high-speed CAN variant. This protocol is used for communication between various electronic control units (ECUs) within the vehicle, allowing them to share data and work together efficiently.

High-speed CAN supports high bandwidth and can transmit data quickly, which is essential for modern vehicles where numerous systems, including powertrain, body, and infotainment, need to communicate seamlessly. By employing this efficient communication network, GMLAN enhances the performance and capabilities of vehicle electronics, improving overall vehicle functionality and enabling advanced features like real-time diagnostics and control.

In contrast, the other options refer to different communication protocols or standards. UART (Universal Asynchronous Receiver/Transmitter) is a serial communication protocol, Class 2 is an older protocol used in some GM vehicles for diagnostics, and Keyword 2000 is another protocol related to vehicle diagnostics but not specifically tied to the GMLAN framework. Understanding the role of GMLAN helps in grasping the evolution and sophistication of automotive electronic communication systems.