In the case of the 2013 Malibu example there was a single page diagram for the cooling fans. However, since that single page appeared to me as complicated as an aerial view of a corn maze, I decided to print out 3 copies of the same page - one for each speed / fan combination. This allowed me to move on to Step 2 - marking up my 'roadmap' to make it easier to understand. May 2020 Maze to Roadmap: Step 2 - Select Important (and familiar) Circuits and Highlight Them We all know that powers and grounds are important so highlight them first. Jorge Menchu, founder of AES Wave, was an early advocate of this system of using highlighters (or even crayons) to color code complex wiring schematics. I recall one of Jorge's first classes on this topic at a MACS 4 MACS Service Reports