Delayed Locking
When this feature is enabled and the doors are locked with the power lock switch on the instrument panel or front door panels, three chimes sound to signal that the delayed locking feature is in use. All doors lock five seconds after the last door is closed.
When the delayed locking feature is in use, pressing 
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instrument panel or front door panels, or the RKE transmitter will override the
feature and lock all doors immediately.
This feature can be programmed by using the Driver Information Center (DIC). See “Delayed Door Lock” in Vehicle Personalization. The delayed locking feature is only available if “Unlocked Door Anti-Lockout” is disabled.
See also:
Advanced safety features based on 'control and alert' strategy
The Cadillac XTS' technology fundamentally supports a suite of advanced
safety features, based on a "control and alert" strategy that extends the vision
around the vehicle. It helps driv ...
Control Buttons
The buttons used to control the radio are:
RADIO/BAND: Press to turn the radio on and choose between AM, FM, and XM™,
if equipped.
MENU/SELECT: Press and turn to navigate the available menus.
...
Front Fog Lamp Light
The front fog lamp light comes on when the fog lamps are in use.
The light goes out when the fog lamps are turned off. See Fog Lamps
for more information. ...