GMC SIERRA 1999 Owner's Manual

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2-43 Front Reading Lamps (If Equipped)
If your vehicle has reading
lamps, press the button next
to the lamp to turn the lamp
on. The lamps can be
adjusted to point in the
direction you want.
Press the button again to turn the lamp off.
Dome Lamps
The dome lamps will come on when you open the doors.
You can also turn the dome lamps on by rotating the
thumb wheel, located next to the parking/headlamps
knob, all the way up to the second notch. In this
position, the dome lamps will remain on whether the
doors are opened or closed.
You can use the DOME OVERRIDE button, located
below the parking/headlamp knob, to set the dome
lamps to come on automatically when the doors are
opened, or remain off. To turn the lamps off, press the
button once. With the button in this position, the dome
lamps will remain off when the doors are open. To
return the lamps to automatic operation, press the button
again and return it to the ªoutº position. With the button
in this position, the dome lamps will come on when you
open the door.

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2-44 Cargo Lamp
Press the ribbed top part of
the switch to turn the cargo
lamp on. Press the bottom
of the switch to turn it off.
The dome lamp switch must be on or one of the doors
open for the cargo lamp to work.
Mirrors
Inside Day/Night Rearview Mirror
Pull the tab under the mirror rearward to reduce glare
from headlamps behind you after dark. Push the tab
forward for normal daytime operation.

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2-45 Electrochromic Inside Rearview Mirror
with Compass (If Equipped)
Your vehicle may have an electrochromic inside
rearview mirror.
When on, an electrochromic mirror automatically dims
to the proper level to minimize glare from lights behind
you after dark.
The mirror also includes an eight
-point compass display
in the upper right corner of the mirror face. When on,
the compass automatically calibrates as the vehicle
is driven.Mirror Operation
The right side of the switch located at the bottom of
the mirror turns the electrochromic mirror on and off.
The AUTO LED will come on when the electrochromic
mirror is turned on. To turn the mirror on, press and hold
the MIRROR button for three seconds. The mirror will
darken and remain dark until the button is released.
To turn the mirror off, press and release the
MIRROR button.

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Compass Operation
Press the COMP switch once briefly to turn the compass
on or off.
When the ignition and the compass feature are on, the
compass will show two character boxes for
approximately two seconds. After two seconds, the
mirror will display the compass heading.
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner. Do not spray
glass cleaner directly on the mirror as that may cause the
liquid cleaner to enter the mirror housing.
Compass Calibration
The compass may need calibration if:

After five seconds, the display does not show a
compass heading (ªNº for North, for example), there
may be a strong magnetic field interfering with the
compass. Such interference may be caused by a
magnetic antenna mount, magnetic note pad holder
or a similar magnetic item.

The compass does not display the correct heading
and the compass zone variance is set correctly.
In order to calibrate, the letter ªCº must be displayed in
the mirror compass windows. If ªCº is not displayed,push in the ªCOMPº button for approximately eight
seconds or until the letter ªCº is displayed.
The compass can be calibrated in one of two ways:

Drive the vehicle in circles at 5 mph (8 km/h) or less
until the display reads a direction, or

Drive the vehicle on your everyday routine and after
several turns the compass will become calibrated and
will display a direction.
Compass Variance
The mirror is set in zone eight upon leaving the factory.
It will be necessary to adjust the compass to compensate
for compass variance if you live outside zone eight.
Under certain circumstances, as during a long distance
cross
-country trip, it will be necessary to adjust for
compass variance. Compass variance is the difference
between earth's magnetic north and true geographic
north. If not adjusted to account for compass variance,
your compass could give false readings.
To adjust for compass variance:
1. Press and hold the COMP button (located at the
bottom of the mirror) for three seconds until a zone
number appears in the display.
2. Find your current location and variance zone number
on the following zone map.

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3. Press the COMP button on the bottom of the mirror
until the new zone number appears in the display.
After you stop pressing the button in, the display will
show a compass direction within a few seconds.
Outside Manual Adjust Mirrors
Adjust your outside mirrors so you can just see the
side of your vehicle and have a clear view of objects
behind you. Some mirrors can be folded in, to enter
narrow doorways.
The use of hood
-mounted air deflectors and add-on
convex mirror attachments may adversely affect
mirror performance.

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2-48 Camper-Type Outside Mirrors
(If Equipped)
If your vehicle is equipped with the camper-type
mirrors, they can be adjusted so you can have a clear
view of objects behind you.
1. To adjust the mirrors when hauling a slide-in camper
or towing a trailer, rotate the mirror by pushing the
mirror head toward the front of the vehicle.

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2. Rotate the mirror head, so that the mirror surface
faces the rear of the vehicle.
West Coast-Type Outside Mirrors
(If Equipped)
If your vehicle is equipped with the west coast-type
mirrors, they can be adjusted so you can have a clear
view of objects behind you.
A. Outer Mirror Frame
B. Mirror Head
C. Nut
The mirrors can be adjusted by rotating the mirror
head (B) and moving the outer mirror frame (A)
backward or forward. You can also loosen the nut (C)
on the top and bottom of the outer mirror frame to tilt
the mirror head.

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2-50 Electric Outside Rearview Mirrors
(If Equipped)
Select the mirror you want
to move by moving the
center of the switch, located
on the driver's door armrest,
to L (left) or R (right).
Then, adjust the mirror angle by pressing the outer
arrows on the switch until the mirror is adjusted where
you want it.
Convex Outside Mirror
Your passenger's side mirror may be convex. A convex
mirror's surface is curved so you can see more from the
driver's seat.
CAUTION:
A convex mirror can make things (like other
vehicles) look farther away than they really are.
If you cut too sharply into the right lane, you
could hit a vehicle on your right. Check your
inside mirror or glance over your shoulder before
changing lanes.
Storage Compartments
Your vehicle includes a number of storage
compartments for storage of often
-used items.
Some vehicles have storage areas in the instrument
panel. Use these spaces for items such as gloves or
small books.
Some models have a storage pocket on each of the
front doors.
Some vehicles have a storage area behind the seat.
Glove Box
To open your glove box, move the button toward the
passenger's side and pull the door open.

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2-51 Center Overhead Console (If Equipped)
Your vehicle may have an overhead console. It has
storage compartments inside it.
Installing a Garage Door Opener
If you have a garage door opener, the front overhead
compartment can be used to conveniently store
the opener.
1. To install the garage door opener, first open
the compartment door by pressing the release
button forward.
2. Peel the protective
backing from the hook
and loop patch. Press it
firmly to the back of
your garage door opener,
as close to the center of
the opener as possible.3. Center the garage door opener activation button over
the console door button, and press the opener firmly
into place.
The pegs inside the compartment door are used to
make sure the button on the compartment door will
contact the control button on the garage door opener.
4. Add one peg at a time
until the PUSH button
on the compartment
door operates the garage
door opener, with the
compartment door
closed, when you
press the button
marked PUSH.

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5. Now, with the
compartment door
closed, press the button
marked PUSH again
to make sure the
garage door opener
operates properly.
With the garage door opener positioned properly and
the right number of pegs in place, you should only
have to press the PUSH button slightly to operate
the opener.
6. Adjust the position of the garage door opener and
add or remove pegs, as needed, until the opener
operates properly.Sunglasses Storage Compartment
The center overhead compartment can be used to
conveniently store your sunglasses.
To open the center compartment, press the release
button located at the rear of the compartment door.
Place your sunglasses in the compartment door with the
lenses facing out.
The rear compartment can be used to store a small item,
like a book.
To open the rear compartment, press the release button
located at the rear of the compartment door.