2005 CHEVROLET TRAIL BLAZER Owners Manual

Compass Variance
Compass variance is the difference between earth’s
magnetic north and true geographic north. The mirror is
set to 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 conditions, such as during a long-distance,
cross-country trip, it will be necessary to adjust for
compass variance. If not adjusted to account for
compass variance, the compass could give false
readings. To adjust for compass variance do the
following:
1. Find the current location and variance zone number
on the following zone map.
2. Press and hold the on/off button until a zone
number appears in the display.
3. Once a zone number appears in the display, press
the on/off button quickly until the correct zone
number appears in the display. If C appears in the
compass window, the compass may need
calibration. See “Compass Calibration” explained
previously.
2-39

Manual Rearview Mirror with
OnStar
®and Compass
The vehicle may have a manual rearview mirror with
OnStar®and an eight-point compass display located in
the upper right.
Control buttons for the OnStar
®system are at the
bottom of the mirror. See your GM dealer for more
information on the OnStar
®system. Also, seeOnStar®
System on page 2-47for more information about the
services OnStar®provides.
Mirror Operation
While sitting in a comfortable position, adjust the
rearview mirror so you can see clearly behind your
vehicle. Grip it in the center and move it up or down and
side to side. The day/night control, located at the
bottom of the mirror, adjusts the mirror to reduce
headlamp glare from behind during evening or dark
conditions. Push the control for daytime use; pull it for
night use.
Compass Display
O
(On/Off):Press this button to turn the compass on
or off. The compass display, can show a maximum
of two characters. For example, NE is displayed
for north-east.
When the ignition and the compass/temperature
feature are on, character boxes will appear for about
two seconds. After two seconds, the mirror will display
the direction the vehicle is facing.
Compass Calibration
When on, the compass automatically calibrates as the
vehicle is driven. If, after two seconds, the display
does not show a compass direction, (N for North, for
example), there may be a strong magnetic eld
interfering with the compass. Such interference may be
caused by a magnetic antenna mount, magnetic
note pad holder, or a similar magnetic item. If the letter
C should ever appear in the compass window, the
compass may need calibration.
Press and hold the on/off button for nine seconds to
activate the compass calibration mode. CAL will
be displayed in the compass window on the mirror.
The mirror can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display shows
a direction.
2-40

Compass Variance
Compass variance is the difference between earth’s
magnetic north and true geographic north. The mirror is
set to 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 conditions, such as during a long-distance,
cross-country trip, it will be necessary to adjust for
compass variance. If not adjusted to account for
compass variance, the compass could give false
readings. To adjust for compass variance do the
following:
1. Find the current location and variance zone number
on the following zone map.
2. Press and hold the on/off button until a zone
number appears in the display.
3. Once a zone number appears in the display, press
the on/off button quickly until the correct zone
number appears in the display. If C appears in the
compass window, the compass may need
calibration. See “Compass Calibration” explained
previously.
2-41

Manual Rearview Mirror with
Compass and Temperature
The vehicle may have a manual rearview mirror with an
eight-point compass and temperature display located
in the upper right.
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.
Mirror Operation
While sitting in a comfortable position, adjust the
rearview mirror so you can see clearly behind your
vehicle. Grip it in the center and move it up or down and
side to side. The day/night control, located at the
bottom of the mirror, adjusts the mirror to reduce
headlamp glare from behind during evening or dark
conditions. Push the control for daytime use; pull it for
night use.
Temperature and Compass Display
O
(On/Off):Press this button to turn the compass and
temperature display on or off. The compass display,
can show a maximum of two characters. For example,
NE is displayed for north-east.When the ignition and the compass/temperature
feature are on, character boxes will appear for about
two seconds. After two seconds, the mirror will display
the direction the vehicle is facing and the outside
temperature.
To set the temperature in Fahrenheit or Celsius, do the
following:
1. Press and hold the on/off button until either a
ashing F or C appears.
2. Press the button again to change the display
to the desired unit of measurement. After about
four seconds of inactivity, the new unit will be
locked in and the compass/temperature display
will return.
Compass Calibration
When on, the compass automatically calibrates as the
vehicle is driven. If, after two seconds, the display
does not show a compass direction, (N for North, for
example), there may be a strong magnetic eld
interfering with the compass. Such interference may be
caused by a magnetic antenna mount, magnetic
note pad holder, or a similar magnetic item. If the
letter C should ever appear in the compass window,
the compass may need calibration.
2-42

Press and hold the on/off button for nine seconds to
activate the compass calibration mode. CAL will
be displayed in the compass window on the mirror.
The mirror can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display shows
a direction.
Compass Variance
Compass variance is the difference between earth’s
magnetic north and true geographic north. The mirror is
set to 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 conditions, such as during a long-distance,
cross-country trip, it will be necessary to adjust for
compass variance. If not adjusted to account for
compass variance, the compass could give false
readings. To adjust for compass variance do the
following:
1. Find the current location and variance zone number
on the following zone map.2. Press and hold the on/off button until a zone
number appears in the display.
3. Once a zone number appears in the display, press
the on/off button quickly until the correct zone
number appears in the display. If C appears in the
compass window, the compass may need
calibration. See “Compass Calibration” explained
previously.
2-43

Manual Rearview Mirror with
OnStar
®, Compass, and
Temperature Display
The vehicle may have a manual rearview mirror with
OnStar®and an eight-point compass and temperature
display located in the upper right.
Control buttons for the OnStar
®system are at the
bottom of the mirror. See your GM dealer for more
information about the OnStar
®system. Also, see
OnStar®System on page 2-47for more information
about the services OnStar®provides.
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.
Mirror Operation
While sitting in a comfortable position, adjust the
rearview mirror so you can see clearly behind your
vehicle. Grip it in the center and move it up or down and
side to side. The day/night control, located at the
bottom of the mirror, adjusts the mirror to reduce
headlamp glare from behind during evening or dark
conditions. Push the control for daytime use; pull it for
night use.
Temperature and Compass Display
O
(On/Off):Press this button to turn the compass and
temperature display on or off. The compass display,
can show a maximum of two characters. For example,
NE is displayed for north-east.
When the ignition and the compass/temperature
feature are on, character boxes will appear for about
two seconds. After two seconds, the mirror will display
the direction the vehicle is facing and the outside
temperature.
To set the temperature in Fahrenheit or Celsius, do the
following:
1. Press and hold the on/off button until either a
ashing F or C appears.
2. Press the button again to change the display
to the desired unit of measurement. After about
four seconds of inactivity, the new unit will be
locked in and the compass/temperature display
will return.
Compass Calibration
When on, the compass automatically calibrates as the
vehicle is driven. If, after two seconds, the display
does not show a compass direction, N for North, for
example, there may be a strong magnetic eld
interfering with the compass. Such interference may be
2-44

caused by a magnetic antenna mount, magnetic note
pad holder, or a similar magnetic item. If the letter
C should ever appear in the compass window,
the compass may need calibration.
Press and hold the on/off button for nine seconds to
activate the compass calibration mode. CAL will
be displayed in the compass window on the mirror.
The mirror can be calibrated by driving the vehicle in
circles at 5 mph (8 km/h) or less until the display shows
a direction.
Compass Variance
Compass variance is the difference between earth’s
magnetic north and true geographic north. The mirror is
set to 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 conditions, such as during a long-distance,
cross-country trip, it will be necessary to adjust for
compass variance. If not adjusted to account for
compass variance, the compass could give false
readings. To adjust for compass variance do the
following:
1. Find the current location and variance zone number
on the following zone map.2. Press and hold the on/off button until a zone
number appears in the display.
3. Once a zone number appears in the display, press
the on/off button quickly until the correct zone
number appears in the display. If C appears in the
compass window, the compass may need
calibration. See “Compass Calibration” explained
previously.
2-45

Outside Manual Mirrors
If the vehicle has the manual outside mirrors, adjust
each outside mirror so that a little of the vehicle and the
area behind it can be seen while sitting in a comfortable,
driving position.
Both mirrors can be manually folded inward by pulling
them towards the vehicle. Push the mirrors away
from the vehicle, to the normal position, before driving.
Outside Power Mirrors
The vehicle may have this feature.
The control is located on
the driver’s door.Turn the knob counterclockwise or clockwise to adjust
the driver’s or passenger’s mirror so that you can see a
little of the side of your vehicle. After adjusting the
position of the mirrors, turn the knob to the center
position so that the mirrors cannot move.
If the travel position in any direction of the mirror is
reached, it will enter a ratcheting mode. This action is
harmless. It is a warning that the mirror can go no
further. To stop this action, back the mirror up by moving
the knob in the opposite direction.
Outside Curb View Assist Mirror
If the vehicle has this feature, the passenger’s outside
mirror will adjust to a preset tilt position while the vehicle
is in REVERSE (R) gear. Curb view assist may be
useful when you are parallel parking. The mirror
will return to normal position when the vehicle is shifted
out of REVERSE (R) gear. Automatic mirror movement
in either direction will follow a short delay.
You may be able to turn this feature on or off through
the Driver Information Center (DIC). SeeDIC Vehicle
Customization on page 3-56.
2-46