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Brake reserve system warning (if equipped)
Illuminates to indicate normal
Hydromax booster reserve system
activation when the engine is OFF
and the service brake pedal is
applied, or when the ignition is in
the ON or START position.
This light may also illuminate momentarily if the engine is running and
the driver turns the steering wheel fully in one direction while braking.
If the light remains on while the engine is running, this indicates
inadequate hydraulic booster pressure or reserve pump system failure.
Stop the vehicle safely as soon as possible and seek service immediately.
Brake system warning
Momentarily illuminates when the
ignition is turned to the ON position
and the engine is off. If the brake
warning lamp does not illuminate at
this time seek service immediately.
If equipped with a hydraulic brake system and the warning lamp remains
illuminated after engine start up, this indicates a brake system
malfunction. Stop the vehicle safely as soon as possible and seek service
immediately.
If equipped with an air brake system, the warning light stays on until the
air pressure builds up to 414 kPa (60 psi). If the air pressure drops
below 414 kPa (60 psi) during operation, the remaining brake system is
still operational but the stopping distance will be greater.
Anti-lock brake system (ABS)
Momentarily illuminates when the
ignition is turned to the ON position
and the engine is off. If the light
remains on after the vehicle is
started, continues to flash or fails to
illuminate, have the system serviced immediately. With the ABS light on,
the anti-lock brake system is disabled and normal braking is still effective
unless the brake warning light also remains illuminated.
BRAKE
ABS
Instrumentation
11
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Trailer ABS brake system (if equipped)
Illuminates briefly when the engine
is powered-up and only when a PLC
trailer or a PLC diagnostic tool is
connected. If the light remains on
after the vehicle is started,
continues to flash or fails to illuminate, have the system serviced
immediately.
Parking brake warning (Hydraulic brakes only)
Momentarily illuminates when the
ignition is turned to the ON position
and the engine is off. Also
illuminates when the parking brake
is engaged. If the brake warning
lamp does not illuminate at these
times, seek service immediately.
Safety belt
Illuminates to remind you to fasten
your safety belts. For more
information, refer to theSeating
and safety restraintschapter.
Check trans (Allison automatic transmission)
The lamp will illuminate for several
seconds after the ignition is turned
to the ON position. Illumination of
this light indicates that a problem
has been detected and shifting may be restricted. Depending upon the
severity of the problem, the read-out digit on the shifter display may be
blank. Operation may continue in order to reach service assistance. The
ECU may not respond to shift selector requests, since operating
limitations are being placed on the transmission, i.e. upshifts and
downshifts may be restricted. Direction changes will not occur.
Refer to the Transmission Operator’s Manual for more information.
P
BRAKE
CHECK
TRANS
Instrumentation
12
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Range inhibit
Illuminates when the transmission is
not engaged in the selected gear.
The warning light will go off when
the gearshift lever is adjusted in to
the appropriate gear.
Refer to the Transmission Operator’s Manual for more information.
Charging system (if equipped)
Illuminates when the ignition is
turned to the ON position and the
engine is off, or an over voltage
condition requiring electrical system service.
Wait to start
Indicates the air intake heater is in
operation and special starting
procedures are required. Refer to
theDrivingchapter.
If equipped with an air intake heater, DO NOT use ether or any
other starting fluids. The use of starting fluids (ether) in an
engine equipped with an air intake heater could result in damage
and/or personal injury.
RANGE
INHIBIT
WAIT
TO
START
Instrumentation
13
Page 14 of 248

Water in fuel (if equipped)
During refueling it is possible for
water-contaminated diesel fuel to be
pumped into your fuel tank. Your
vehicle fuel system is equipped with
a fuel filter/water separator to
remove water from the fuel. The indicator light illuminates when the fuel
filter/water separator has a significant quantity of water, or when the
ignition key is switched to the START position. If the light illuminates
when the engine is running, stop the vehicle as soon as safely possible,
shut off the engine and drain the filter bowl. Allowing water to stay in
the system could result in extensive damage to, or failure of, the fuel
injection system.
To drain the fuel filter/water separator (refer toMaintenance and
Specificationschapter for procedure). Rotate the valve at the bottom of
the filter assembly allowing water to drain from the system. Close the
valve upon completion.
Do not drain water separator while engine is running. Fuel may
ignite if separator is drained while engine is running or vehicle is
moving.
Air clean warning (if equipped)
Illuminates when the air system is
restricted (dirty, clogged).
Turn signal
Illuminates when the left or right
turn signal or the hazard lights are
turned on. If one or both of the
indicators stay on continuously or flash faster, check for a burned-out
turn signal bulb. Refer toExterior bulbsin theLightschapter.
High beams
Illuminates when the high beam
headlamps are turned on.
WATER
IN
FUEL
AIR
CLEAN
Instrumentation
14
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Safety belt warning chime
Sounds to remind you to fasten your safety belts.
BeltMinderchime
Sounds intermittently to remind you to fasten your safety belts.
Headlamps on warning chime
Sounds when the headlamps or parking lamps are on, the key is removed
from the ignition and the driver’s door is opened.
Key-in-ignition warning chime
Sounds when the key is left in the ignition and the driver’s door is
opened.
Parking brake warning chime — F650 SuperCrewzer
Sounds when the parking brake knob is pulled and the parking brake is
not functioning properly.
For information on the parking brake warning chime, refer to the
Parking brake (SuperCrewzer and Allison automatic transmission
with Park in Park)in theHydraulic brakessection in theDriving
chapter.
GAUGES
Instrumentation
15
Page 17 of 248
Air pressure gauge and warning buzzer (if equipped)
Indicates the amount of air pressure
in the brake system (green=primary,
red=secondary) in pounds per
square inch. When the pressure is
too low for normal brake operation
(less than 414 kPa [60 psi]) and the
ignition is turned to ON:
•a warning buzzer sounds
•the warning light illuminates
All vehicles have a dual-pointer air
pressure gauge to indicate the pressure in both brake circuits.
Vehicles equipped with rear air suspension also have a dual-pointer air
pressure gauge.
Do not drive the vehicle when the low air pressure buzzer is
sounding or the warning light is lit. These warnings indicate
there is not enough air pressure for the brake or suspension system to
operate properly.
Battery voltage gauge
Indicates battery voltage. If the
pointer moves and stays outside the
normal operating range, have the
vehicle’s electrical system checked
as soon as possible.
0 30120 90 60
150AIR
PRESSURE
PSI
818
Instrumentation
17
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Volume/power control
Press the control to turn the audio
system on or off.
Turn the control to raise or lower
volume.
If the volume is set above a certain level and the ignition is turned off,
the volume will come back on at a“nominal”listening level when the
ignition switch is turned back on.
Bass adjust
The bass adjust control allows you
to increase or decrease the audio
system’s bass output.
Press the TONE control once, then
use the volume knob to adjust the
desired level.
Treble adjust
The treble adjust control allows you
to increase or decrease the audio
system’s treble output.
Press the TONE control twice, then
use the volume knob to adjust the
desired level.
VOL
PUSH
ON
VOL
PUSH
ON
TONE
CLK
VOL
PUSH
ON
TONE
CLK
VOL
PUSH
ON
Entertainment Systems
21
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AM/FM STEREO CASSETTE
Volume/power control
Press the control to turn the audio
system on or off.
Turn the control to raise or lower
volume.
If the volume is set above a certain level and the ignition is turned off,
the volume will come back on at a“nominal”listening level when the
ignition switch is turned back on.
SCAN
BASS TREB BAL FADE
SIDE
EJ
REW FF1 - 2TAPE
AMS
VOL - PUSH ON
SEEK
TUNE
AM
FMCLK
12 3456
FM1ST
VOL - PUSH ON
VOL - PUSH ON
Entertainment Systems
25