Cadillac 2008 CTS - Manual (Page 156)

Turning the exterior lamp control to off or to the
low-beam headlamp position will turn off the DRL. If the
parking lamps or the fog lamps were turned on
instead, the DRL will still turn off.
This will work regardless of gear position and whether
or not the parking brake is set.
Light Sensor
The light sensor for the DRL and AUTO headlamp
feature is located on top of the instrument panel. If the
sensor is covered, it will prevent it from sensing
light, and the exterior lamps or the Headlamps
Suggested message will appear on the DIC whenever
the ignition is on.
Adaptive Forward Lighting System
The Adaptive Forward Lighting System (AFL) swivels
the headlamps horizontally to provide greater road
illumination while turning. AFL will operate when
the vehicle speed is greater than 2 mph (3 km/h).
AFL will not operate when the transmission is in
REVERSE (R). AFL is not immediately operable after
starting the vehicle; driving a short distance is required
to calibrate the AFL. To enable AFL, set the exterior
lamp switch on the multifunction lever to the AUTO
position. Moving the switch out of the AUTO position will
deactivate the system. See Headlamps on page 3-16.
Fog Lamps
Use the fog lamps for better vision in foggy or misty
conditions.
The fog lamp control is located on the turn
signal/multifunction lever.
- (Fog Lamps): Turn the fog lamp band on the lever
up to - and release it, to turn the fog lamps on or
off. The band will return to its original position.
The parking lamps must be on for the fog lamps to work.
If the high-beam headlamps are turned on, the fog
lamps will also turn off. They will turn back on again
when you switch back to low-beam headlamps.
Some localities have laws that require the headlamps to
be on along with the fog lamps.
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