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Home >> Saturn >> 2009 >> Astra XE, Standard >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Data Communications >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Circuit/System Description

Circuit/System Description

Modules connected to the low speed GMLAN serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules when the ignition switch is in any position other than OFF. The low speed GMLAN serial data circuit must be operational for the vehicle to start so the vehicle theft deterrent (VTD) module and steering column control module (SCCM) can communicate.

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