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Power Moding Schematics

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Ignition I Voltage & 12-Volt Reference Circuit Schematic
GM2065107Courtesy of GENERAL MOTORS CORP.
Fig 2: Ignition II/III Voltage Circuit Schematic
GM2065109Courtesy of GENERAL MOTORS CORP.
Fig 3: Ignition III Voltage & Accessory Voltage Circuit Schematic
GM2065111Courtesy of GENERAL MOTORS CORP.