Full Description

General

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

GMLAN provides a family of serial communication buses to enableElectronic Control Units (ECUs) to communicate with each other.GMLAN comprises of three buses, a Low Speed bus, a Mid Speed busand a High Speed bus, all of which are based on the Controller AreaNetwork (CAN) communications protocol. The three buses are asfollows.

• High speed bus - typically used for sharing real time datasuch as driver commanded torque, actual engine torque, steeringangle, etc.

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

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

Use of a given bus in a vehicle depends upon howfeature/functions in that vehicle are partitioned among differentECUs.

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