The Autostart AS-2386TWS is compatible with manual transmission vehicles, and comes pre-set for such vehicles. If you are installing in an automatic vehicle, follow the steps to configure for automatic transmission.
Valet Mode means turning the AS-2386TWS off, whether it is for servicing the vehicle or when valet parking (for example). By no means do you have to turn the AS-2386TWS off, but if you want to turn it off you may do so through the valet mode procedure.
Entering and exiting (turning on/off) valet mode is done via methods as outlined below.