@rivken
You press it when you're in a race. If the code works it should switch instantly to AI control. I haven't experimented like this, though. The code I have works with Cheat Engine. So I don't have button activator like you do..
Also, try changing 11FBEC48 to 21FBEC48 (the address I have in Cheat engine), you may have entered it wrong in the pnach
Note that this AI code will only work on single races.
21FBCAF4 Control (AI Switch, Arcade Time Attack)
21FBCAFC Control (AI Switch, Arcade Free Run)
21FBCB28 Control (AI Switch, Arcade Race)
21FBDC04 Control (AI Switch, Series Race)
21FBEC48 Control (AI Switch, Single Race)
21FF27E8 Control (AI Switch, License)
21FF2BFC Control (AI Switch, Free Run)
Edit: Using the he wrong code on the wrong race will remove the race countdown. Meaning no 3.2.1.Start thing. Weird thing. So I don't advise entering them all and activate them all, you might break the game.
Thank Xenn for this, not me. He found those addresses