Turn on your bike and then hold the "+" button for a few seconds. To turn them off, hold the "+" button for 3 seconds.
The lights should turn on and off. If they do not, you may have to swap the location of the positive and negative wire at the light if they are plug and play on your model (This varies by generation, some headlights are wired permanently).
If you recently installed a new internal controller, there is a chance the lights are connected to the wrong wire of the internal controller. You can verify with the labelled controllers on these pages for each model: 500 Series - 700 Series
In a rare case, if that does not resolve it, please contact us with a few pictures. Let us know what you tried so far and any related information. We will work with you to make sure they are working!