Page 110 of 352

Instantaneous fuel economy
Press INFO until the menu displays
“MPG”. This will display your fuel
economy as a Bar Graph ranging
from poor economy to excellent
economy.
Your vehicle must be moving to calculate instantaneous fuel economy.
When your vehicle is not moving, this function shows one or no bars
illuminated. Instantaneous fuel economy cannot be reset.
Trip elapsed drive time
Select this function from the INFO
menu to display a timer.
To operate the Trip Elapsed Drive
Time perform the following:
1. Press and release RESET in order
to start the timer.
2. Press and release RESET to pause the timer.
3. Press and hold RESET for 2 seconds in order to reset the timer.
Setup menu
Press this control for the following
displays:
•Reset to English (if in another
language)
•System Check
•Oil Life
•Units (English/Metric)
•Autolamp Delay (if equipped)
•Easy/Entry Exit
•Air Suspension (if equipped)
•Autolock (if equipped)
•Power Liftgate
•Power Deployable Running Boards (if equipped)
•Compass Zone (if equipped)
•Compass Calibration (if equipped)
•Language
2008 Navigator(nav)
Owners Guide (post-2002-fmt)
USA(fus)
Driver Controls
110
Page 114 of 352

System check
Selecting this function from the
SETUP menu causes the message
center to cycle through each of the
systems being monitored. For each
of the monitored systems, the
message center will indicate either
an OK message or a warning message for two seconds.
Pressing the RESET control cycles the message center through each of
the systems being monitored.
The sequence of the system check report and how it appears in the
message center is as follows:
1. OIL LIFE
2. CHARGING SYSTEM
3. WASHER FLUID LEVEL
4. DOOR STATUS
5. LIFTGATE/GLASS
6. BRAKE FLUID LEVEL
7. TIRE PRESSURE SYSTEM (if equipped)
8. AIR SUSPENSION SYSTEM
9. FUEL LEVEL
System warnings
System warnings alert you to possible problems or malfunctions in your
vehicle’s operating systems.
In the event of a multiple warning situation, the message center will
cycle the display to show all warnings by displaying each one for 4
seconds.
The message center will display the last selected feature if there are no
more warning messages. This allows you to use the full functionality of
the message center after you acknowledge the warning by pressing the
RESET control and clearing the warning message.
Warning messages that have been reset are divided into three categories:
•They cannot be cleared until the condition is corrected.
•They will reappear on the display ten minutes from the reset.
•They will not reappear until an ignition OFF-ON cycle has been
completed.
2008 Navigator(nav)
Owners Guide (post-2002-fmt)
USA(fus)
Driver Controls
114
Page 115 of 352

This acts as a reminder that these warning conditions still exist within
the vehicle.
Warning display Status
Driver door ajar Warning can be reset. Will return if
reset and warning is cleared and set
again within the same ignition cycle.
Will return on ignition cycle. Passenger door ajar
Rear left door ajar
Rear right door ajar
Door ajar
Liftgate/glass ajar
Check charging system
Tire pressure sensor fault (if
equipped)
Low tire pressure (if equipped)
Tire pressure monitor fault (if
equipped)
4x4 shift in progress (if
equipped)
Air suspension OFF
Brake fluid level low Warning can be reset. Will NOT return
if reset and warning is cleared and set
again within the same ignition cycle.
Will return on ignition cycle. Check park brake
Washer fluid level low
Oil change required
Engine oil change soon
Check air suspension
Check brake system Warning can be reset. Will return after
10 minutes. If within the 10 minutes,
the condition is cleared and set again,
it will not return until the initial 10
minutes is up. Will return on ignition
cycle. XXX miles (km) to empty fuel
level low
2008 Navigator(nav)
Owners Guide (post-2002-fmt)
USA(fus)
Driver Controls
115
Page 118 of 352

An oil change is required whenever indicated by the message center and
according to the recommended maintenance schedule. USE ONLY
RECOMMENDED ENGINE OILS.
To reset the oil monitoring system to 100% after each oil change
[approximately 7,500 miles (12,070 km) or 6 months] perform the
following:
1. Press and release the SETUP
control to display “OIL LIFE =
XXX% HOLD RESET = NEW”.
2. Press and hold the RESET
control for 2 seconds and release.
Oil life is set to 100% and “OIL LIFE
SET TO 100%” is displayed.
POSITIVE RETENTION FLOOR MAT
Do not install additional floor mats on top of the factory installed
floor mats as they may interfere with the accelerator or the
brake pedals.
Position the driver floor mat so that
the eyelet is over the pointed end of
the retention post and rotate
forward to lock in. Make sure that
the mat does not interfere with the
operation of the accelerator or the
brake pedal. To remove the floor
mat, reverse the installation
procedure.
2008 Navigator(nav)
Owners Guide (post-2002-fmt)
USA(fus)
Driver Controls
118