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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Data Communication System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

The devices connected to the chassis high speed GMLAN serial data circuits (circuit numbers 6105 & 6106) monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices when the S39 Ignition Switch (or S38 Ignition Mode Switch) is in any position other than OFF. The chassis high speed GMLAN serial data bus uses terminating resistors that are in parallel with the chassis high speed GMLAN (+) and (-) circuits.

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