Cadillac 2010 DTS - Manual (Page 196)

To idle the vehicle with the DRL off at night, turn off
automatic lighting and shift the transmission into P (Park).
Placing the vehicle in P (Park) disables the DRL. The
DRL will stay off until the vehicle is shifted out of P (Park).
To drive the vehicle with the DRL off, turn off automatic
lighting and manually turn on the parking lamps or
fog lamps, if the vehicle has them.
The regular headlamp system should be turned on
when needed.
Fog Lamps
The fog lamps button is on the exterior lamps control to
the left of the steering column.
# (Fog Lamps): Press the exterior lamps button to
turn the fog lamps on or off. A light comes on in
the instrument panel cluster when the fog lamps are in
use. See Instrument Panel Cluster on page 4-47.
The ignition must be in the ON/RUN position for the
fog lamps to work.
The fog lamps will go off when the headlamps are
changed to high-beam.
Some localities have laws that require the headlamps to
be on along with the fog lamps.
Cornering Lamps
The cornering lamps come on when the headlamps or
parking lamps are on and you signal a turn with the
multifunction lever. They provide more light for
cornering.
Exterior Lighting Battery Saver
If the exterior lamp button has been left on, the exterior
lamps will turn off about 10 minutes after the ignition
is turned to LOCK/OFF and a door has been opened.
This protects against draining the battery if the
headlamps or parking lamps are accidentally left on.
If you need to leave the lamps on for more than
10 minutes, use the exterior lamp control to turn the
lamps back on after the ignition is turned to LOCK/OFF
and any door is opened.
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