With the turn signal lever in the low-beam position, pull the lever toward you momentarily to switch to high-beam, to signal that you are going to pass.
If the headlamps are on, they will return to low-beam when the lever is released.
For vehicles with High Intensity Discharge (HID) headlamps, the flash-to-pass feature does not work while the Daytime Running Lamps (DRL) are on.