GMC 2011 Yukon Denali Owner's Manual page 334

9-56 Driving and Operating
How the System Works
Left Side Mirror Right Side Mirror
Display
When the vehicle is started, both
outside mirror displays will briefly
come on to indicate that the system
is operating. When the vehicle is
moving forward, the left or right side
mirror SBZA display will light up if a
vehicle is detected in that blind
zone. If the turn signal is activated
and a vehicle is also detected on
the same side, the SBZA display will
flash to give you extra warning not
to change lanes.
SBZA displays do not come on
while the vehicle is approaching or
passing other vehicles. At speeds
greater then 32 km/h (20 mph),
SBZA displays may come on when
a vehicle you have passed remains
in or drops back into the
detection zone.
Display
SBZA can be disabled through the
Driver Information Center (DIC). See
If the SBZA is disabled by the
driver, the SBZA mirror displays will
not light up during normal driving.
When the System Does Not Seem
To Work Properly
Occasional missed alerts can occur
under normal circumstances and
will increase in wet conditions.
The system does not need to be
serviced due to an occasional
missed alert. The number of missed
alerts will increase with increased
rainfall or road spray.
for more information.
If the SBZA displays do not light up
when the system is on and vehicles
are in the blind zone, the system
may need service. Take the vehicle
to your dealer.
SBZA is designed to ignore
stationary objects; however, the
system may occasionally light up
due to guard rails, signs, trees,
shrubs, and other stationary objects.
This is normal system operation, the
vehicle does not need service.
SBZA does not operate when the
left or right corners of the rear
bumper are covered with mud, dirt,
snow, ice, slush, or in heavy
rainstorms. For cleaning
instructions, see Washing the
Vehicle under
. If the DIC still displays
the SIDE BLIND ZONE SYS.
UNAVAILABLE message after
cleaning the bumper, see your
dealer.