Hazard light thing.
Power up the car without the brake (will not get the green GO car).
Push the hazard button 6 times. Once it turns it on, once it turns it off, so like 3 on/off cycles.
The car will beep and say "Train left tire"
You drain the air until the car beeps and then move on to the next tire.
Fill all tires first to where you want them to be, then start the procedure.
After all 4 tires the car beeps twice.
Then you fill the tires back up to the original pressure.
You need to train them every time you chance the running pressure. In other words if you increase the pressure for better mpg numbers, retrain all the tires to the new setting.