Marker Lamps
If your vehicle has this feature, you can manually blink
the marker and clearance lamps.
The marker lamp defeat
switch is located in the
instrument panel
switchbank.
Press and hold the bottom of the switch to turn off the
marker and clearance lamps. When you release
the switch, the marker and clearance lamps will come
back on.
Instrument Panel Brightness
This feature controls the brightness of the instrument
panel lights.
The thumbwheel for this feature is located to the right of
the exterior lamp control.
Turn the thumbwheel up to brighten the lights. When
the thumbwheel is moved to the first position, the radio
display and transmission selection display will go to
full intensity. The instrument panel cluster will also be
dimly lit. Moving the thumbwheel up to the next position
will activate the interior dome lamps.
Dome Lamps
The dome lamps will come on when you open a door.
You can also turn the dome lamps on by moving
the thumbwheel, located to the right of the exterior lamp
control, all the way up to the second position. In this
position, the dome lamps will remain on whether a door
is open or closed.
3-16
Speedometer and Odometer
Your speedometer lets you see your speed in both
miles per hour (mph) and kilometers per hour (km/h).
Your odometer shows how far your vehicle has
been driven, in either miles (used in the United States)
or kilometers (used in Canada).
Trip Odometer
The trip odometer can tell you how far your vehicle has
been driven since you last set the trip odometer to zero.
While the engine is running, press the reset button,
located to the right of the trip odometer, to toggle
between the trip odometer and the regular odometer.
Holding the reset button for two seconds while the
engine is running and the trip odometer is displayed,
will reset it.
To display the odometer reading with the ignition off,
press the reset button.
The hourmeter gage is accessed through the trip
odometer, for more information seeHourmeter Gage
on page 3-46.
Tachometer
This gage shows the safe operating range for the
engine speed in revolutions per minute (rpm).7.2L Caterpillar
®Diesel
Engine and Isuzu
6H Diesel EnginesGasoline and
6.6L DURAMAX®
Diesel Engines
3-26
Range Inhibit Warning Indicator
If your vehicle has an Allison 1000/2200/2300/2500 series
automatic transmission, a lighted bar under the current
gear selected will flash.
If your vehicle has an Allison 3000/3500 series
automatic transmission, the current gear selected on
the pushbutton display will flash.
The flashing bar or gear selection indicates that
transmission range shifts may not occur.
For detailed information on shift inhibit limitations, see
the Allison Automatic Transmission Operator’s Manual in
your vehicle for further information.
Brake System Warning Light
Your vehicle has either hydraulic or air brakes.
Each system has different warning lights.
Hydraulic Brake System Warning Lights
Vehicles with hydraulic brake systems have two brake
system warning lights on the instrument panel.
If the brake warning light
comes on, it means that
the fluid level in the master
cylinder reservoir is low or
there is another problem
with your hydraulic brakes.
When it comes on, you will also hear a warning tone.
This light should come on briefly when you turn the
ignition key to RUN. If it does not come on, then have it
fixed so it will be ready to warn you if there is a problem.
The brake warning light may come on, and the warning
tone may sound, when you are turning and braking
at the same time. This is normal. See “Hydraulic Brake
Systems” underBraking on page 4-4.
3-32
Air Pressure Gage
If your vehicle has air
brakes, the air pressure
gage is located above the
switchbank in the center
of the instrument panel.
This gage shows the air pressure for both your front
and rear brake systems.
If the needle on the gage indicates that the air pressure
is below 60 to 75 psi (415 to 517 kPa), the low air
warning light will come on. An alarm will also sound if
this happens.
The bottom yellow pointer shows the pressure available
for the front secondary system, while the top white
pointer shows pressure for the rear primary system.
There should be no more than 4 psi (28 kPa) difference
showing between the systems.
Don’t drive until both pointers are showing at least
120 psi (827 kPa), so you’ll have enough air if you need
to apply your brakes.
Hourmeter Gage
To access the engine hourmeter gage, press the trip
odometer button three times.
The instrument panel cluster displays the accumulated
engine run time hours using the reconfigurable
odometer display. The engine run time hours displays
only when the ignition is in the LOCK/OFF or
ACC/ACCESSORY position and the trip reset button is
pressed for about four seconds. The value of the
accumulated hours does not change when the battery
is disconnected.
The hourmeter resets to 0.0 when 10,000 hours are
accumulated. The instrument panel cluster begins
to reaccumulate the engine run time hours from
0.0 hours.
3-46
Setting the Clock
Press and hold the HR (down) or MIN (up) arrow for
two seconds. Then press HR until the correct hour
displays. Press and hold MIN until the correct minute
displays. The time can be set with the ignition on or off.
Radio(s)
Your vehicle has one of these radios as its radio system.
Playing the Radio
PWR (Power):Press to turn the system on and off.
VOL (Volume):Turn clockwise or counterclockwise to
increase or to decrease the volume.
RCL (Recall):Press to switch the display between
the radio station frequency and the time. When the
ignition is off, press to display the time. Radio with CD shown, AM-FM Radio similar
Radio with Cassette
3-48
Finding a Station
AM FM:Press to switch between FM1, FM2, and AM.
The selection displays.
TUNE:Turn to select radio stations.
oSEEKp:Press the arrows to go to the previous or
to the next station.
To scan stations, press and hold either arrow for
two seconds until a beep sounds. The radio goes to a
station, plays for a few seconds, then goes to the
next station. Press either arrow again to stop scanning.
To scan preset stations, press and hold either arrow
for more than four seconds until two beeps sound.
The radio goes to the first preset station stored on the
pushbuttons, plays for a few seconds, then goes to
the next preset station. Press either arrow again to stop
scanning presets.
The radio only seeks and scans stations, with a strong
signal, that are in the selected band.
Setting Preset Stations
Up to 18 stations (six FM1, six FM2, and six AM),
can be programmed on the six numbered pushbuttons,
by performing the following steps:
1. Turn the radio on.
2. Press AM FM to select FM1, FM2, or AM.
3. Tune in the desired station.
4. Press and hold one of the six numbered
pushbuttons until a beep sounds. When that
numbered pushbutton is pressed, the station that
was set, returns.
5. Repeat Steps 2 through 4 for each pushbutton.
3-49
Setting the Tone (Bass/Treble)
AUDIO:To adjust the bass or the treble, press and
release the AUDIO button until BAS (bass) or TRE
(treble) displays. Then press and hold the up
wor the
down
xarrow to increase or to decrease. If a station
is weak or has static, decrease the treble.
To adjust bass or treble to the middle position, select
BAS or TRE. Then press and hold the AUDIO button for
more than two seconds until a beep sounds. B and a
zero or T and a zero displays.
To adjust both tone controls and both speaker controls
to the middle position, first end out of audio mode
by pressing another button, causing the radio to perform
that function, or by waiting five seconds for the display
to return to the time of day. Then press and hold
the AUDIO button for more than two seconds until a
beep sounds. CEN (center) displays.
Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance between the right
and the left speakers, press and release the AUDIO
button until BAL (balance) displays. Then press and hold
the up
wor the downxarrow to move the sound
toward the right or the left speakers.
To adjust the fade between the front and the rear
speakers, press and release the AUDIO button until
FAD (fade) displays. Then press and hold either arrow
to move the sound toward the front or the rear speakers.
To adjust balance or fade to the middle position,
select BAL or FAD. Then press and hold AUDIO for
more than two seconds until a beep sounds. B (balance)
and a zero or F (fade) and a zero displays.
To adjust both tone controls and both speaker controls
to the middle position, first end out of audio mode
by pressing another button, causing the radio to perform
that function, or by waiting five seconds for the display
to return to the time of day. Then press and hold
the AUDIO button for more than two seconds until a
beep sounds. CEN displays.
Fade may not be available if the vehicle is a regular
cab model.
3-50
Radio Messages
CAL (Calibration):The audio system has been
calibrated for your vehicle from the factory. If CAL
displays it means that the radio has not been configured
properly for your vehicle and must be returned to your
dealer/retailer for service.
LOC (Locked):This message displays when the
THEFTLOCK
®system has locked up. Take the vehicle
to your dealer/retailer for service.
If any error occurs repeatedly or cannot be corrected,
contact your dealer/retailer.
Playing a CD
Insert a CD partway into the slot, label side up.
The player pulls it in and the CD should begin playing.
CD displays. If you want to insert a CD with the
ignition off, first press the eject button or the RCL knob.
If you insert a CD with the radio off and the ignition
on, it starts to play.
If the ignition or radio is turned off, with a CD in the
player, it stays in the player. When the ignition or radio
is turned on, the CD starts playing where it stopped,
if it was the last selected audio source.As each new track starts to play, the track number
displays.
The CD player can play the smaller 3 inch (8 cm)
single CDs with an adapter ring. Full-size CDs and the
smaller CDs are loaded in the same manner.
Care of Your CDs
If playing a CD-R, the sound quality can be reduced
due to CD-R quality, the method of recording, the quality
of the music that has been recorded, and the way the
CD-R has been handled. Handle them carefully.
Store CD-R(s) in their original cases or other protective
cases and away from direct sunlight and dust.
The CD player scans the bottom surface of the disc.
If the surface of a CD is damaged, such as cracked,
broken, or scratched, the CD does not play properly
or not at all. Do not touch the bottom side of a CD while
handling it; this could damage the surface. Pick up
CDs by grasping the outer edges or the edge of the hole
and the outer edge.
If the surface of a CD is soiled, take a soft, lint free
cloth or dampen a clean, soft cloth in a mild, neutral
detergent solution mixed with water, and clean it.
Make sure the wiping process starts from the center
to the edge.
3-51