Headlamps On Reminder; Daytime Running Lamps (Drl); Automatic Headlamp System - GMC 2009 Envoy Denali Owner's Manual

Headlamps on Reminder

A reminder tone sounds when the headlamps or
parking lamps are manually turned on, if the driver's
door is open and the ignition is in LOCK/OFF or
ACC/ACCESSORY. To turn the tone off, turn the knob
all the way counterclockwise.
In the automatic mode, the headlamps turn off once the
ignition key is in LOCK/OFF.

Daytime Running Lamps (DRL)

Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the day.
Fully functional DRL are required on all vehicles
first sold in Canada.
The DRL system makes the headlamps come on at
reduced brightness when the following conditions
are met:
•
The ignition is on.
•
The exterior lamps knob is in automatic
headlamp mode.
•
The light sensor detects daytime light.
•
The transmission is not in P (Park).
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When the DRL are on, only the headlamps will be on.
The taillamps, sidemarker, instrument panel lights
and other lamps will not be on.
When it begins to get dark, the headlamps automatically
switch from DRL to the regular headlamps.

Automatic Headlamp System

When it is dark enough outside, the Automatic
Headlamp System turns on the headlamps when
the vehicle is started and after the transmission
has been shifted out of the P (Park) position.
The headlamps, taillamps, sidemarker, and parking
lamps will come on. The instrument panel lights
and radio lights will also turn on at normal brightness.
Once on, the system remains on during these conditions
even if the vehicle is shifted back into P (Park).
The vehicle has a light sensor on the top of the
instrument panel. Do not cover the sensor or the system
may come on whenever the ignition is on and the
vehicle is shifted out of the P (Park) position.
The system could also turn on the lamps when driving
through a parking garage, heavy overcast weather
or a tunnel. This is normal.