Cadillac 1993 DeVille Owners Literature page 156

Electronic Solar Sensor
The Electronic Solar Sensor is part of the Electronic Climate Control
System. It is located on top of your instrument panel speaker grill.
The sensor monitors
the sun's solar
radiation by telling the
Electronic Climate
Control system what
angle and the intensity
the sun is at. The
Electronic Climate
Control then can
automatically make
the necessary
temperature
adjustments.
AUDIO SYSTEMS
Your Dekoa sound system has been designed to operate easily and give
years of listening pleasure. But you will get the most enjoyment out of
it if
you acquaint yourself with it first. Find out what your Delcoa system can
do and how to operate all its controls, to be sure you're getting the most
out of the advanced engineering that went into it.