GMC 2011 Yukon XL Denali Owner's Manual page 314

9-56 Driving and Operating
The rear vision camera system
display in the rearview mirror may
turn off or not appear as expected
due to one of the following
conditions. If this occurs the left
indicator light on the mirror will
flash.
A slow flash may indicate a loss
of video signal, or no video
signal present during the reverse
cycle.
A fast flash may indicate that the
display has been on for the
maximum allowable time during
a reverse cycle, or the display
has reached an Over
Temperature limit.
The fast flash conditions are
used to protect the video device
from high temperature
conditions. Once conditions
return to normal the device will
reset and the green indicator will
stop flashing.
During any of these fault conditions,
the display will be blank and the
indicator will continue to flash as
long as the vehicle is in R (Reverse)
or until the conditions return to
normal.
z
Pressing and holding
left indicator light is flashing will turn
off the video display along with the
left indicator light.
Fuel
Use of the recommended fuel is
an important part of the proper
maintenance of this vehicle. To help
keep the engine clean and maintain
optimum vehicle performance, we
recommend the use of gasoline
advertised as TOP TIER Detergent
Gasoline.
Look for the TOP TIER label on the
fuel pump to ensure gasoline meets
enhanced detergency standards
developed by auto companies. A list
when the
of marketers providing TOP TIER
Detergent Gasoline can be found at
www.toptiergas.com.