Cadillac 2005 DeVille - Manual (Page 135)

If you move the lever all the way to the right, the lamps
will remain on for approximately three minutes after
the ignition has been turned to OFF. If you move
the lever so it is barely on, the lamps will go off quickly
when you turn the ignition switch out of OFF. You
can adjust the delay time from only a few seconds to
about three minutes.
If it is dark enough outside and the Twilight
Sentinel
® lever is off, a HEADLAMPS SUGGESTED
message will display on the Driver Information Center
(DIC). This message informs the driver that turning
on the exterior lamps is recommended because it has
become dark enough outside to require the headlamps
and/or other exterior lamps. Turning on the Twilight
Sentinel
® or turning the exterior lamp control to
the headlamp position will remove the HEADLAMPS
SUGGESTED message.
Light Sensor
The light sensor for the DRL and the Twilight
Sentinel
® is located in the center of the front defogger
grille. If you cover the sensor, it will read “dark” and the
exterior lamps or the HEADLAMPS SUGGESTED
message will be displayed whenever the ignition is on.
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