The next time you are out for a drive get up to 55 and let the RPM's settle down. Then press the button. Your RPM's *should* rise when you press the button indicating that you are no longer in OD but in D. The change is typically a few hundred RPM so it should be easily noticed if you are somewhere that you can maintain speed. You might get the reverse, a drop in RPM's, by pressing the button but usually electronic setups reset when the vehicle is turned off. Either way there should be a change in your rpm's by a good 3-5 hundred rpm up or down when pressing the button.eroth88 wrote:how would i actually know if it is working or not?