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 Outlet(s).............................3-19
Ashtray(s) 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....................................3-27
Safety Belt Reminders...................................3-27
Airbag Readiness Light..................................3-28
Airbag Off Light............................................3-29
Charging System Light..................................3-30
Voltmeter Gage............................................3-31
Service Transmission Warning Light................3-31
Range Inhibit Warning Indicator......................3-32
Brake System Warning Light..........................3-32
Anti-lock Brake System (ABS) Warning Light. . . .3-34
Trailer Antilock Brake System Warning Light.....3-34
Engine Coolant Temperature Gage..................3-35
Low Coolant Warning Light............................3-35
Wait to Start Indicator...................................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
Transmission Temperature Gage.....................3-39
Section 3 Instrument Panel
3-1
Hazard Warning Flashers
The hazard warning flashers warn others. They also let
the police and other emergency vehicles know you
have a problem.
The hazard warning
flasher button is
located on top of the
steering column.
Press the button to make the front and rear turn signal
lamps flash on and off. Press the button again to
turn the flashers off.
The hazard warning flashers work no matter what
ignition position the key is in, and even if the key is not
in the ignition.
When the hazard warning flashers are on, your vehicle’s
turn signals will not work.
Other Warning Devices
If you carry reflective triangles, you can set them up at
the side of the road about 300 feet (100 m) behind
your vehicle.
Horn
Sound the horn by pushing the center of the steering
wheel. If you have the optional air horn, it is controlled
by a cord that you will find up above and to the left
of the driver. The harder you pull on the cord, the louder
the air horn will sound. The air horn works only after
your air brake system pressure gets up to about
115 psi (790 kPa). The air horn will work properly
unless the air brake system pressure drops below
60 psi (415 kPa).
3-6
Hydraulic Brake Pads
Brake pad lining life will vary depending on vehicle
application, working environment, equipment
maintenance, and style of driving. The brake pad lining
wear rate has to be monitored for individual driving
habits — original equipment linings have mechanical
wear indicators to help with this. When you are down to
the last 10% of the brake lining, the brake lining wear
indicator will rub on the rotor, causing a scratching or
chirping sound. When you hear this sound, it is time to
service the brake pads. SeeScheduled Maintenance on
page 6-5.
Aftermarket brake linings might not meet the same
stringent requirements as the original equipment linings.
Using aftermarket brake linings can affect braking
performance, pedal feel, noise, and lining wear.
Air Brake Systems
If your vehicle has air brakes, it is important to get rid of
moisture in the system. Moisture will damage the
system if it is not removed daily.
There are two ways to do this. One is automatic through
the air brake vehicle’s air dryer with integral automatic
moisture ejector that purges air from the system through
a self-contained reservoir. The other way to drain
moisture from the air brake system is to manually activate
drain valves at each reservoir. Drain the air reservoirs
occasionally to be sure the air dryer is working properly.Drain the air brakes at full system pressure. To be sure
you are at full pressure, check the air pressure gage.
It should read at least 100 psi (692 kPa).
Air Dryer
If your vehicle has air brakes, it has an air dryer
mounted on the passenger side frame rail. This collects
and removes dirt, moisture, or other foreign matter
from the air prior to entering the brake system. The dryer
also acts as a moisture ejector. It automatically ejects
the moisture when the compressor cycles. The
purge tank has a manual drain valve that must be
drained every day. See “Air Brake Systems” for the
manual drain procedure.
The dryer has a filter that you need to change at
intervals. SeeScheduled Maintenance on page 6-5for
more about servicing this filter.
Electric Air Compressor
Your vehicle might have an electric air compressor. This
compressor is used to run options that require
pressurized air, such as an air horn or air seat.
The air compressor is used when vehicles do not have
an air brake system.
5-60
Fuse Usage
RR DEFOG Rear Defogger
ENG 1 Engine 1
ENG 3 Engine 3 (L18/LF6/LF8)
PCM-B Powertrain Control Module
TCM Transmissions (LF8)
ENG 4 Engine 4 (LMM/LF6/LF8)
ENG 2 Engine 2 (L18/LMM)
HTD FUEL Heated Fuel (LMM)
BLANK Not Used
BLANK Not Used
NOTE 3 Fan Relay (LMM), Emissions (L18)
A/C COMP Air Conditioning Compressor
ABS 1 Antilock Brake System 1
ABS 2 Antilock Brake System 2
ABS 3 Antilock Brake System 3
ENGINE Engine
E/A PUMP Electronic/Automatic Pump
HORN HornFuse Usage
NOTE 2Fuel (L18/LMM), Electronic Control
Module (LF6)
NOTE 4 Electronic Control Module (LF6)
STUD A Spare
STUD B Spare
Relay Usage
NOTE 1 LMM/L18 Fuel Pump Relay
IGN B RELAY Ignition Relay
STARTER
RELAYStarter Relay
HORN RELAY Horn Relay
IGN A RELAY Ignition Relay
PTO/ECU*
RELAYPower Take-Off/Engine Control Unit
(*Diesel 7.8L LF8)
REVERSE
RELAYReverse Relay
FAN RELAY Fan Relay (LMM)
5-107
Gage (cont.)
Speedometer..............................................3-26
Tachometer.................................................3-26
Transmission Temperature.............................3-39
Voltmeter Gage...........................................3-31
Gasoline
Octane........................................................ 5-7
Specifications............................................... 5-7
Gasoline Engine, Starting.................................2-12
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Headlamp Wiring...........................................5-102
Headlamps
Bulb Replacement.......................................5-76
Daytime Running Lamps...............................3-15
Exterior Lamps............................................3-14
High/Low Beam Changer................................ 3-8
On Reminder..............................................3-15
Heater...........................................................3-20
High Idle System............................................2-20
Highbeam On Light.........................................3-41
Highway Hypnosis...........................................4-15
Hill and Mountain Roads..................................4-15Hood
Checking Things Under................................5-22
Latches......................................................5-22
Horn............................................................... 3-6
Hourmeter Gage.............................................3-46
How to Wear Safety Belts Properly...................1-16
I
Ignition Positions.............................................2-11
Infants and Young Children, Restraints...............1-31
Inflation - Tire Pressure...................................5-82
Instrument Panel
Overview..................................................... 3-4
Switchbank.................................................3-18
Instrument Panel (I/P)
Brightness..................................................3-16
Cluster.......................................................3-25
J
Jump Starting.................................................5-67
K
Keyless Entry System....................................... 2-3
Keys............................................................... 2-2
6