Cadillac 2009 STS-V - Manual (Page 192)

Fog Lamps
The fog lamp controls are located on the turn
signal/multifunction lever.
#
(Fog Lamps): The band with this symbol is used to
turn the fog lamps on and off.
The parking lamps must be on for the fog lamps
to work.
To turn the fog lamps on or off, turn the fog lamp band
on the lever up to the dot and release it. The band
will return to its original position.
If the high-beam headlamps are turned on, the fog
lamps will turn off. The fog lamps will come back
on when the high-beam headlamps are off.
Some localities have laws that require the headlamps to
be on along with the fog lamps.
Twilight Sentinel ®
Twilight Sentinel ® can turn the lamps on and off for you.
A light sensor on top of the instrument panel makes the
Twilight Sentinel work, so be sure it is not covered.
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