light GMC ENVOY DENALI 2007 Workshop Manual

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 transaxle
has been shifted out of the PARK (P) 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 PARK (P).
The vehicle has a light sensor on the top of the
instrument panel. Make sure it is not covered or the
system may come on whenever the ignition is on
and the vehicle is shifted out of the PARK (P)
position.
The system could also turn on the lamps when
driving through a parking garage, heavy overcast
weather or a tunnel. This is normal.There is a delay in the transition between the
daytime and nighttime operation of the Daytime
Running Lamps (DRL) and the automatic headlamp
systems, so that driving under bridges or bright
overhead street lights does not affect the system.
The DRL and automatic headlamp system are only
affected when the light sensor sees a change in
lighting lasting longer than the delay.
If you start your vehicle in a dark garage, the
automatic headlamp system comes on after the
transmission is shifted out of PARK (P). Once you
leave the garage, it will take about one minute
for the automatic headlamp system to change to
DRL if it is light outside. During that delay, the
instrument panel cluster might not be as bright as
usual. Make sure the instrument panel brightness
control is in the full bright position.
If the vehicle is running and the automatic
headlamp system is already on, it can be turned
off by turning and releasing the headlamp
control at the off position. The automatic headlamp
system stays off until you turn and release the
headlamp control at the off position again.
SeeHeadlamps on page 179.
181

Fog Lamps
Use the fog lamps for better vision in foggy or
misty conditions. The ignition must be in RUN for
the fog lamps to work.
The fog lamp button is
located on the
instrument panel to the
right of the exterior
lamps knob.
Press the button to turn the fog lamps on. Press
the button again to turn them off. A light glows
near the button while the fog lamps are on.
Fog lamps turn off whenever the high-beam
headlamps are on.
Some localities have laws that require the
headlamps to be on along with the fog lamps.
Instrument Panel Brightness
Press the knob located
next to the exterior
lamps knob to extend it.
Turn the knob to adjust the instrument panel
lights. Turn the knob all the way up to turn on the
interior lamps. Press the knob back into its
stored position when you are not using it.
Dome Lamps
The dome lamps will come on when you open a
door unless the dome lamp override is pressed in.
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Dome Lamp Override
The dome override
button is located
below the exterior
lamps knob.
To turn the dome lamps off, press the button.
The dome lamps will remain off when a door is
open. This will override the illuminated entry
feature unless you use the Remote Keyless
Entry (RKE) transmitter to unlock the vehicle.
To return the lamps to automatic operation, press
the button again. The dome lamps come on
when a door is opened.
Entry Lighting
The vehicle has entry lighting.
When any door is opened, the dome lamps come
on as long as the dome override lamp override
button is not pressed in. When all the doors
are closed, the lamps stay on for a short period of
time and then turn off automatically. If you use
the Remote Keyless Entry (RKE) transmitter
to unlock the vehicle, the interior lamps come on
for a short time whether or not the dome lamp
override is on.
Exit Lighting
With exit lighting, the interior lamps come on when
you remove the key from the ignition. If the
dome override is off, these lamps stay on for a
short period of time and then go out.
Reading Lamps
The reading lamps are located in the front
console.
Press the lens on the lamps to turn the reading
lamps on or off.
183

Electric Power Management
This vehicle has Electric Power
Management (EPM), an advanced control
system. It estimates the battery’s temperature
and state of charge and then adjusts the voltage
for best performance and extended life of
the battery.
When the battery’s state of charge is low, the
voltage is raised slightly to quickly put the charge
back in. When the state of charge is high, the
voltage is lowered slightly to prevent overcharging.
If the vehicle has a voltmeter gage, you may
see the voltage move up or down. This is normal.
If there is a problem, an alert will be displayed.
The battery can be discharged at idle if the
electrical loads are very high. This is true for all
vehicles. This is because the generator (alternator)
may not be spinning fast enough at idle to
produce all the power that is needed for very high
electrical loads.A high electrical load occurs when several of the
following loads are on: headlamps, high beams,
fog lamps, rear window defogger, climate
control fan at high speed, heated seats, engine
cooling fans, trailer loads, and loads plugged into
accessory power outlets.
EPM works to prevent excessive discharge of the
battery. It does this by balancing the generator’s
output and the vehicle’s electrical needs. It
can increase engine idle speed to generate more
power, whenever needed. It can temporarily
reduce the power demands of some accessories.
Normally, these actions occur in steps or levels,
without being noticeable. In rare cases at the
highest levels of corrective action, this action may
be noticeable to the driver. If so, a Driver
Information Center (DIC) message might be
displayed, such as Battery Saver Active or Battery
Voltage Low. If this message is displayed, it is
recommended that the driver reduce the electrical
loads as much as possible. SeeDIC Warnings
and Messages on page 222.
184

Ashtray(s) and Cigarette Lighter
Your vehicle may have this feature. The ashtray is
removable and ts into the front cupholder.
Notice:If you put papers, pins, or other
ammable items in the ashtray, hot cigarettes
or other smoking materials could ignite
them and possibly damage your vehicle. Never
put ammable items in the ashtray.
To remove the ashtray, pull the covered bin out of
the cupholder.
To use the lighter, press it in all the way, and let
go. When it is ready, it will pop back out by itself.
Notice:Holding a cigarette lighter in while
it is heating will not allow the lighter to
back away from the heating element when it is
hot. Damage from overheating may occur to
the lighter or heating element, or a fuse could
be blown. Do not hold a cigarette lighter in
while it is heating. Do not use equipment
exceeding maximum amperage rating of
20 amperes.
Climate Controls
Dual Climate Control System
With this system you can control the heating,
cooling, and ventilation for your vehicle.
9(Fan):Turn the left knob clockwise or
counterclockwise to increase or decrease the fan
speed. If the knob is in off mode, outside air
still enters the vehicle, and is directed based on
the position of the mode knob. The temperature
can still be adjusted using the temperature knob.
Turn the right knob clockwise or counterclockwise
to direct the airow inside of your vehicle.
186

To change the current mode, select one of the
following:
H(Vent):This mode directs air to the instrument
panel outlets.
)(Bi-Level):This mode directs about half of the
air to the instrument panel outlets; then directs
most of the remaining air to the oor outlets. A little
air is directed toward the windshield and the
side window outlets. Cooler air is directed to the
upper vents and warmer air to the oor outlets.
6(Floor):This mode directs most of the
air to the oor outlets with a little air directed to
the windshield and the side window outlets.
The recirculation button cannot be selected while
in oor mode.
@(Recirculation):Recirculation mode is used
to recirculate the air inside of your vehicle.
When this button is pressed, an indicator light in
the button will come on to let you know that it
is active. Use this mode to help prevent outside
odors and/or dust from entering your vehicle or to
help cool the air inside of your vehicle more
quickly. The air conditioning compressor will also
come on when this mode is activated. While in
recirculation mode, the windows may fog when the
weather is cold and damp. To clear the fog,
select either the defog or defrost mode and
increase fan speed.
Defog and defrost modes are described later in
this section.
187

Driver’s Side Temperature Lever:The lever on
the left side of the climate control panel is
used to raise or lower the temperature on the
driver’s side of the vehicle. Slide the lever up or
down to adjust the temperature.
Passenger’s Side Temperature Lever:The lever
on the right side of the climate control panel is
used to raise or lower the temperature on
the passenger’s side of the vehicle. Slide the lever
up or down to adjust the temperature. This lever
also adjusts the temperature to the rear seat
outlets.
When the temperature outside is 0°F (-18°C) or
lower, use the engine coolant heater, if the vehicle
has one, to provide warmer air, faster to your
vehicle.
#(Air Conditioning):Press this button to turn
the air-conditioning system on or off. When
the button is pressed, an indicator light will come
on and the system will begin to cool and
dehumidify the air inside of the vehicle. You may
notice a slight change in engine performance
when the air conditioning compressor shuts off and
turns on again. This is normal.
Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate
control system is used properly. There are
two modes to choose from to clear fog or frost
from your windshield. Use the defog mode to clear
the windows of fog or moisture and warm the
passengers. Use the defrost mode to remove fog
or frost from the windshield more quickly.
Turn the right knob clockwise or counterclockwise
to select one of the following modes:
-(Defog):This mode directs the air to the oor
outlets, windshield and side window outlets.
The recirculation button cannot be selected while
in defog mode.
1(Defrost):This mode directs most of the air to
the windshield and the side window outlets, with
only a little air directed to the oor outlets. The air
conditioning compressor may run to dehumidify
the air to prevent window fogging. The recirculation
button cannot be selected while in defrost mode.
Do not drive the vehicle until all the windows
are clear.
188

Rear Window Defogger
If your vehicle has the rear window defogger a
warming grid is used to remove fog on the
rear window.
<(Rear):Press this button to turn the rear
window defogger on or off. An indicator light in the
button will come on to let you know that the
rear window defogger is active. The rear window
defogger will automatically turn off approximately
ten minutes after the button is pressed.
If your vehicle has heated mirrors, this button will
activate them.
Notice:Do not use anything sharp on the
inside of the rear window. If you do, you could
cut or damage the warming grid, and the
repairs would not be covered by your warranty.
Do not attach a temporary vehicle license,
tape, a decal or anything similar to the
defogger grid.
Dual Automatic Climate Control
System
With this system you can control the heating,
cooling and ventilation for your vehicle. When your
vehicle is rst started and the climate control
system is on, or if the climate control system
has been turned on, the display will show
the driver’s temperature setting for ve seconds.
Then it will show the outside temperature.
189

H(Vent):This mode directs air to the instrument
panel outlets.
)(Bi-Level):This mode directs approximately
half of the air to the instrument panel outlets, then
directs the remaining air to the oor outlets.
A little air is directed toward the windshield and the
side window outlets. Cooler air is directed to the
upper outlets and warmer air to the oor outlets.
6(Floor):This mode directs most of the air to the
oor outlets. Some air also comes out of the
defroster and side window outlets. The recirculation
button cannot be selected in oor mode.
@(Recirculation):Press this button to turn
recirculation mode on or off. When this button is
pressed, an indicator light in the button will also
come on to let you know that it is activated.
Recirculation mode is used to recirculate the air
inside of your vehicle. Use this mode to help
prevent outside odors and/or dust from entering
your vehicle or to help cool the air inside of your
vehicle more quickly. Recirculation mode can be
used with vent and bi-level modes, but it cannot be
used with oor, defog or defrost modes. Defog and
defrost modes are described later in this section.If recirculation mode is selected with oor, defog, or
defrost modes, the indicator will ash three times
and then turn off indicating the selection is not
available.
You may also notice that the air conditioning
compressor will run while in recirculation mode.
This is normal and will help to prevent fogging.
If the weather is cold and damp, the system may
cause the windows to fog while using recirculation
mode. If the windows do start to fog, select defog or
defrost mode and increase fan speed.
Recirculation mode, if selected, will be cleared
when the engine is turned off.#A/C (Air Conditioning):Press this button to
manually turn the air conditioning system on or off.
When the system is on, the system will
automatically begin to cool and dehumidify the air
inside of your vehicle. The air conditioning
symbol will appear on the display when the air
conditioning is on and will turn off when the
air conditioning is off.
192

If you turn the air conditioning off while in front
defrost or defog mode, the air conditioning symbol
will turn off, however, the A/C compressor will
remain on to help de-humidify the air inside
the vehicle. If one of the other modes is selected
the compressor will then turn the A/C off until
it is selected again or the AUTO button is pressed.
To avoid fogging the inside glass on rainy and
humid days at a temperature above freezing, press
the air conditioning button to run the A/C
compressor. Also it is best to avoid the use of the
recirculation mode except when maximum air
conditioning performance is needed or for short
times to avoid exterior odors.
You may notice a slight change in engine
performance when the air-conditioning compressor
shuts off and turns on again. This is normal.Defogging and Defrosting
Fog on the inside of the windows is a result of
moisture condensing on the cool window glass.
This can be reduced if the climate control system is
used properly. You can use either defog or front
defrost to clear fog or frost from your windshield.
-(Defog):Use this setting to clear the windows
of fog or moisture. This setting will deliver air
to the oor and windshield outlets.
0(Front Defrost):Press the front defrost button
to clear the windshield and side windows of
frost or fog quickly. The system will automatically
control the fan speed if you select defrost from
AUTO mode. If the outside temperature is
40°F (4°C) or warmer, your air conditioning
compressor will automatically run to help
dehumidify the air and dry the windshield. Do not
drive the vehicle until all the windows are clear.
193