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Home >> Buick >> 2018 >> Envision Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device >> Circuit/System Description

Circuit/System Description

The gateway isolated low speed GMLAN serial data bus is used to communicate information between the devices. The serial data is transmitted over a single wire (circuit number 1102) to the appropriate devices. The K56 Serial Data Gateway Module acts as the gateway module between devices on low speed GMLAN bus and devices on gateway isolated low speed GMLAN bus.