Q: Need help in reading wiring information

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I want to write an app to remote start my Audi A4 2005. I found this: http://www.modifiedlife.com/2005-audi-a4-remote-vehicle-start-wiring-diagram/ This is my first time under the hood for an Audi. Where should I start with the above to create something accessible via my smartphone?

My car has 100500 miles.
My car has an automatic transmission.

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