Shorting CR (White) to GND enables manual Cruise Control, and this is accomplished with a momentary switch on the handlebar.
The Delay for engagement is programmable in the Firmware. The feature is called "Auto Cruise Time" or words to the effect, and the value of the setting is in seconds.
I have mine set to 7 seconds which is actually a fairly long time - but it avoids accidental setting which can be unnerving when unexpected.
If you have CR always shorted to GND, then Cruise will occur automatically depending on the programmed value in the Firmware. As I said, I don't like this feature to engage in this manner and would rather have direct control when and how.
Cruise can be disabled by EBrake, changing Throttle, or touching CR to GND again.
FWIW, I wished Cruise worked like the Auto Industry standard with accelerate and decelerate features. Guess I'll have to roll my own.
Hands-free, KF