Clarion Ungo Pro Security RK1 Owner's Manual page 20

Ignition switch-controlled door-locking on or off. With this feature
on, the doors will lock 3 seconds after the ignition key is turned on,
and unlock when the ignition key is turned off.
Passive Locking or Active Locking (doors lock only with the
remote). With Passive Locking, the vehicle doors lock automatically 30
seconds after the ignition has been turned off. Passive Locking can only
be selected when the system has been programmed for Passive Mode.
The horn honk confirmations for locking and unlocking can be
programmed on or off. In order for this feature to be programmed on,
the horn must be connected to the system.
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