Cadillac 1999 DeVille Owner's Manual page 104

When the Twilight Sentinel switch is on and it's dark
-
enough outside, the low beam headlamps (at reduced
intensity) will turn off and normal low
operation will occur. When the Twilight Sentinel switch
is on and it's bright enough outside, the regular lamps
-
will go off, and the low beam headlamps at reduced
brightness will take over for the DRL.
If it's dark enough outside and the Twilight Sentinel
control 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 even though the DRL
are still illuminated (it's become dark enough outside to
require the headlamps and/or other exterior lamps).
Turning on the Twilight Sentinel, the headlamp switch
or the fog lamp switch will remove the HEADLAMPS
SUGGESTED message.
To idle your vehicle with the DRL off, turn off the
Twilight Sentinel and shift the transaxle into PARK (P).
Placing your vehicle in PARK (P) disables the DRL.
The DRL will stay off until you shift out of PARK (P).
To drive your vehicle with the DRL off, turn off the
Twilight Sentinel and manually turn on the parking lamps.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
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Fog Lamps (DeVille Concours Only)
-
beam headlamp
If you turn on the high
will turn off. They'll turn back on again when you
switch to low
When the Twilight Sentinel is on and the fog lamp
switch is activated, the fog lamps will remain on as well
as the headlamps and parking lamps.
Use the fog lamps for better
vision in foggy or misty
conditions. When you press
the fog lamp button, a small
indicator light will tell you
that the fog lamps and the
parking lamps are on. Press
the button again to turn
them off.
-
beam headlamps, the fog lamps
-
beam headlamps.
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