Mike's Workshop Manuals
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Section 90 (Data Communication System - Schematic Wiring Diagrams)
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Schematic and Wiring Diagrams
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Data Communication Wiring Schematics
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Data Link Connector and Serial Data Gateway Module Power and Ground
Data Link Connector and Serial Data Gateway Module Power and Ground
WARNING:
This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.