Mike's Workshop Manuals
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Section 324 (Cellular System, Entertainment System, And Navigation System)
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OnStar Button LED Malfunction
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Conditions for Running the DTC
Conditions for Running the DTC
WARNING:
This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON.
Battery voltage must be between 9-16 V.