Instrument Panel Overview...............................3-4
Hazard Warning Flashers................................3-6
Other Warning Devices...................................3-6
Horn.............................................................3-6
Tilt Wheel.....................................................3-7
Turn Signal/Multifunction Lever.........................3-7
Turn and Lane-Change Signals........................3-8
Headlamp High/Low-Beam Changer..................3-8
Windshield Wipers..........................................3-9
Windshield Washer.......................................3-10
Cruise Control..............................................3-10
Exterior Lamps.............................................3-14
Headlamps on Reminder................................3-15
Daytime Running Lamps (DRL).......................3-15
Marker Lamps..............................................3-16
Instrument Panel Brightness...........................3-16
Dome Lamps...............................................3-16
Entry Lighting...............................................3-17
Reading Lamps............................................3-17
Instrument Panel Switchbank..........................3-18
Accessory Power Outlets...............................3-19
Ashtrays and Cigarette Lighter........................3-20
Climate Controls............................................3-20
Climate Control System.................................3-20
Outlet Adjustment.........................................3-23
Rear Heating System....................................3-24Warning Lights, Gages, and Indicators............3-24
Instrument Panel Cluster................................3-25
Speedometer and Odometer...........................3-26
Trip Odometer..............................................3-26
Tachometer.................................................3-26
Engine Speed Limiter....................................3-26
Safety Belt Reminder Light.............................3-27
Safety Belt Reminder Tone............................3-27
Airbag Readiness Light..................................3-27
Airbag Off Light............................................3-28
Charging System Light..................................3-30
Voltmeter Gage............................................3-30
Service Transmission Warning Light................3-31
Range Inhibit Warning Indicator......................3-31
Brake System Warning Light..........................3-31
Anti-Lock Brake System Warning Light.............3-34
Trailer Anti-Lock Brake System Warning Light.....3-34
Engine Coolant Temperature Gage..................3-35
Low Coolant Warning Light............................3-35
Wait to Start Indicator (Diesel Engine).............3-36
Malfunction Indicator Lamp.............................3-36
Oil Pressure Gage........................................3-37
Low Oil Level Light.......................................3-38
Change Engine Oil Light................................3-38
Engine Overspeed Warning Light....................3-39
Engine Shutdown Warning Light.....................3-39
Section 3 Instrument Panel
3-1
A. Air Outlets. SeeOutlet Adjustment on page 3-23.
B. Instrument Panel Cluster. SeeInstrument Panel
Cluster on page 3-25.
C. Shift Lever. SeeStarting the Gasoline Engine on
page 2-12orStarting the Diesel Engine on
page 2-14.
D. Air Brake Controls. SeeAir Brake on page 2-40.
E. Transfer Case Controls (If Equipped). See
“Automatic Transfer Case” underFour-Wheel Drive
on page 2-33. Air Filter Gage (If Equipped). See
Air Filter Restriction Indicator on page 3-43.
F. Auxiliary Gages. SeeWarning Lights, Gages, and
Indicators on page 3-24.
G. Exterior Lamp Control. SeeExterior Lamps on
page 3-14.H. Turn Signal/Multifunction Lever. SeeTurn
Signal/Multifunction Lever on page 3-7.
I. Hazard Warning Flashers Button. SeeHazard
Warning Flashers on page 3-6.
J. Audio System(s). SeeAudio System(s) on
page 3-44.
K. Climate Controls. SeeClimate Control System on
page 3-20.
L. Instrument Panel Switchbank. SeeInstrument Panel
Switchbank on page 3-18.
M. Airbag Off Switch. SeeAirbag Off Switch on
page 1-56.
N. Accessory Power Outlets. SeeAccessory Power
Outlets on page 3-19.
3-5
q(Exhaust Brake Switch):SeeDiesel Engine
Exhaust Brake on page 2-25.
l(Differential Lock Control Switch):SeeRear
Axle Differential Lock Contol on page 4-9.
c(Airbag On/Off Switch):SeeAirbag Off Switch on
page 1-56.
If your vehicle does not have some of the features
controlled by these switches, there will be a blank switch
marker in its place.
Accessory Power Outlets
With accessory power outlets, you can plug in auxiliary
electrical equipment such as a cellular telephone or
CB radio.
The accessory power outlet is located on the
passenger’s side of the instrument panel.
To use an outlet, pull the cover down. When not using
it, always cover the outlet with the protective cap.
This circuit is protected by a fuse and has a maximum
current level.Notice:Leaving electrical equipment on for
extended periods will drain the battery. Always turn
off electrical equipment when not in use and do
not plug in equipment that exceeds the maximum
amperage rating.
Certain electrical accessories may not be compatible
with the accessory power outlet and could result
in blown vehicle or adapter fuses. If you experience a
problem, see your dealer for additional information
on accessory power outlets.
Notice:Adding any electrical equipment to your
vehicle may damage it or keep other components
from working as they should. The repairs would not
be covered by your warranty. Do not use equipment
exceeding maximum amperage rating. Check
with your dealer before adding electrical equipment.
When adding electrical equipment, be sure to follow
the proper installation instructions included with
the equipment.
Notice:Improper use of the power outlet can cause
damage not covered by your warranty. Do not
hang any type of accessory or accessory bracket
from the plug because the power outlets are
designed for accessory power plugs only.
3-19
Engine Road Speed Governor
This system controls maximum vehicle speed
automatically and reduces engine power until vehicle
speed gets down to maximum governed speed.
The default setting for C4500 and C5500 models up to
19,500 lbs GVWR is 80 to 85 mph (128 to 136 km/h).
Most other models have a default setting of 75 mph
(120 km/h), although some tire sizes and tread patterns
may limit maximum speed to 55 to 65 mph
(86 to 105 km/h). You may have a label on the headliner
of your vehicle with more information on your engine road
speed governor. See your GM dealer for assistance with
programming your engine limited speed.
Safety Belt Reminder Light
When the key is turned to RUN or START, a light will
come on for several seconds to remind people to fasten
their safety belts.
The safety belt light will
also come on and stay on
for several seconds.
Safety Belt Reminder Tone
If your vehicle has this feature, when you turn your key
to RUN or START, a tone will sound for several
seconds to remind people to fasten their safety belts.
Airbag Readiness Light
If your vehicle has airbags, there is an airbag readiness
light on the instrument panel, which shows the airbag
symbol. The system checks the airbag’s electrical
system for malfunctions. The light tells you if there is an
electrical problem. The system check includes the
airbag sensors, the airbag modules, the wiring, the
passenger airbag suppression circuit and the crash
sensing and diagnostic module. For more information on
the airbag system, seeAirbag System on page 1-48.
This light will come on
when you start your
vehicle, and it will flash for
a few seconds. Then the
light should go out. This
means the system is ready.
3-27
If the airbag readiness light stays on after you start the
vehicle or comes on when you are driving, your
airbag system may not work properly. Have your vehicle
serviced right away.
The airbag readiness light should flash for a few
seconds when you turn the ignition key to RUN or
START. If the light doesn’t come on then, have it fixed
so it will be ready to warn you if there is a problem.
{CAUTION:
If the airbag readiness light stays on after you
start your vehicle, it means the airbag system
may not be working properly. The airbags in
your vehicle may not in ate in a crash, or they
could even in ate without a crash. To help
avoid injury to yourself or others, have your
vehicle serviced right away if the airbag
readiness light stays on after you start
your vehicle.
Airbag Off Light
If your vehicle is equipped with an airbag off switch,
when you turn the right front passenger’s airbag off, this
light will come on and stay on to remind you that the
airbag has been turned off. This light will go off
when you turn the airbag on. SeeAirbag Off Switch on
page 1-56for more on this, including important safety
information.
United States
Canada
3-28