General

GMLAN (General Motors in-vehicle Local Area Network) is a concept based on a serial data link used by Saab and GM.

GMLAN provides a family of serial communication buses to enable Electronic Control Units (ECUs) to communicate with each other. GMLAN comprises of three buses, a Low Speed bus, a Mid Speed bus and a High Speed bus, all of which are based on the Controller Area Network (CAN) communications protocol. The three buses are as follows.

• High speed bus - typically used for sharing real time data such as driver commanded torque, actual engine torque, steering angle, etc.

• Mid speed bus - typically used for infotainment applications (display, navigation, etc) where the system response time demands that a large amount of data be transmitted in a relatively short amount of time, such as updating a graphics display.

• Low speed bus - typically used for operator controlled functions where the system response time requirements are in the range of 100ms.

Use of a given bus in a vehicle depends upon how feature/functions in that vehicle are partitioned among different ECUs.

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