Light Sensor - Cadillac 2004 CTS Owner's Manual

If it's dark enough outside and the exterior lamp control
is off, a Headlamps Suggested message will appear
on the Driver's Information Center (DIC) display.
This message informs the driver that turning on the
exterior lamps is recommended even though the DRL
are still illuminated. Turning the exterior lamp control to
AUTO or to the low-beam headlamp position will
turn off the DRL and cancel the Headlamps Suggested
message. If the parking lamps or the fog lamps were
turned on instead, the DRL will still turn off and the
Headlamps Suggested message will be displayed.
You can turn it off by pressing the OK button if you have
the Navigation audio system or the CLR button if you
have the Base audio system.
To operate your vehicle with the DRL off, turn the exterior
lamp control off. Then turn on the fog lamps or parking
lamps, and the DRL will turn off. The Headlamps
Suggested message will appear on the DIC display.
This will work regardless of gear position and whether
or not the parking brake is set.
As with any vehicle, you should turn on the regular
headlamp system when you need it.

Light Sensor

The light sensor for the DRL and AUTO headlamp
feature is located on top of the instrument panel. If you
cover the sensor, it will read dark, and the exterior
lamps or the Headlamps Suggested message will
appear on the DIC whenever the ignition is on.
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