Exterior Lamps Off; Reminder; Headlamp High/Low-Beam; Changer - GMC 2018 Acadia Denali Owner's Manual

The vehicle's windshield is dirty,
cracked, or obstructed by
something that blocks the view
of the light sensor.
The vehicle is loaded such that
the front end points upward,
causing the light sensor to aim
high and not detect headlamps
and taillamps.
Driving on winding or hilly roads.
The automatic high-beam
headlamps may need to be disabled
if any of the above conditions exist.

Exterior Lamps Off

Reminder

A warning chime sounds if the driver
door is opened while the ignition is
off and the exterior lamps are on.
Headlamp High/
Low-Beam Changer
: Push the turn signal lever away
from you and release, to turn the
high beams on. To return to low
beams, push the lever again or pull
it toward you and release.
This indicator light turns on in the
instrument cluster when the
high-beam headlamps are on.

Flash-to-Pass

This feature is used to signal to the
vehicle ahead that you want
to pass.
If the headlamps are off or in the
low-beam position, pull the turn
signal lever toward you to
momentarily switch to high beams.
Release the lever to turn the
high-beam headlamps off.

Daytime Running

Lamps (DRL)

DRL can make it easier for others to
see the front of your vehicle during
the day.
Lighting
For vehicles with High Intensity
Discharge (HID) headlamps, the
dedicated DRL will come on when
all of the following conditions
are met:
The ignition is on.
The exterior lamp control is
in AUTO.
The light sensor determines it is
daytime.
The parking brake is released or
the vehicle is not in P (Park).
When the DRL are on, the taillamps
and other lamps will not be on.
The DRL turn off when the
headlamps are turned to
ignition is off.

Automatic Headlamp

System

When the exterior lamp control is
set to AUTO and it is dark enough
outside, the headlamps come on
automatically.
157
or the