July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Power Take-Off (PTO) Schematics
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Switch Controls - Power Take-Off (PTO) Circuit Schematic