
Blizzard Conditions
Being stuck in snow can be in a serious situation. Stay
with the vehicle unless there is help nearby. If possible,
use theRoadside Assistance Program on page 7-5.
To get help and keep everyone in the vehicle safe:
•Turn on theHazard Warning Flashers on page 3-6.
•Tie a red cloth to an outside mirror.
{CAUTION:
Snow can trap engine exhaust under the vehicle.
This may cause exhaust gases to get inside.
Engine exhaust contains carbon monoxide (CO)
which cannot be seen or smelled. It can cause
unconsciousness and even death.
If the vehicle is stuck in the snow:
•Clear away snow from around the base of
your vehicle, especially any that is blocking
the exhaust pipe.
•Check again from time to time to be sure
snow does not collect there.
CAUTION: (Continued)
CAUTION: (Continued)
•
Open a window about two inches (5 cm) on
the side of the vehicle that is away from the
wind to bring in fresh air.
•Fully open the air outlets on or under the
instrument panel.
•Adjust the Climate Control system to a setting
that circulates the air inside the vehicle and
set the fan speed to the highest setting. See
Climate Control System in the Index.
For more information about carbon monoxide, see
Engine Exhaust on page 2-45.
Snow can trap exhaust gases under your vehicle.
This can cause deadly CO (carbon monoxide) gas
to get inside. CO could overcome you and kill you.
You cannot see it or smell it, so you might not
know it is in your vehicle. Clear away snow from
around the base of your vehicle, especially any
that is blocking the exhaust.
Run the engine for short periods only as needed to
keep warm, but be careful.
To save fuel, run the engine for only short periods as
needed to warm the vehicle and then shut the engine off
and close the window most of the way to save heat.
4-18

Fuse Usage
16 Airbag System
17 Exterior/Interior Lamps
18 Parking Brake
19 Accessory Power
20 Ignition 4
21 Sidemarker Lamps
22 Turn Signal/Backup Lamps
23 Transmission
24 Hydraulics/Air Brake
A Spare
B Spare
Fuse Usage
Blank Not Used
BRK Brake Warning Lamp
RT PRK Passenger Side Parking Lamps
Blank Not Used
Blank Not Used
LT PARK Driver Side Parking Lamps
RT REAR
TRN/STOPPassenger Side Rear Turn
Signal/Stoplamp
LT REAR
TRN/STOPDriver Side Rear Turn
Signal/Stoplamp
Fuse Usage
RADIO Radio
Blank Not Used
Blank Not Used
PWR WNDW Power Windows
Relay Usage
ECU/PTO*Engine Control Unit/Power Take-Off
*Diesel 7.8 Duramax
BRK LAMPC4/C5 Brake Lamps,
C6/C7/C8 Tractor/Trailer Wiring
DRL Daytime Running Lamps
IGN-4 Ignition
CHMSL Center High Mounted Stoplamp
MRK LTS Sidemarker and Clearance Lamps
HTD/MIRR Heated Mirrors
HTR Diesel Heated Fuel
RT TRN TRLR Passenger Side Trailer Turn Signal
Blank Not Used
LT TRN TRLR Driver Side Trailer Turn Signal
Blank Not Used
Blank Not Used
Blank Not Used
5-98

Mirrors and Sun Visors Check
Check that friction joints hold mirrors and sun visors in
place.
Seat Adjuster Check
When adjusting a manual seat, be sure seat adjusters
latch by attempting to move the seat after latching.
Lamps Check
Check panel lighting, warning lights, indicator lights, and
interior lamps. On the outside, check: license plate lamps,
sidemarker lamps, reflectors or lights on outside mirrors,
headlamps, parking lamps, identification and clearance
lamps, taillamps, brake lamps, turn signals, backup
lamps, and hazard warning flashers. Have headlamp aim
checked at once if beams seem improperly aimed.
Glass, Mirrors, Lamps, and/or
Reflectors Condition Check
Look for broken, scratched, dirty, or damaged glass,
mirrors, lamps, or reflectors that could reduce the view
or visibility or cause injury. Replace, clean, or repair
promptly.
Door Latches Check
Check that doors close, latch, and lock tightly. Check for
broken, damaged, or missing parts that might prevent
tight latching.
Hood Latches Check
Check that the hood closes firmly. Check for broken,
damaged, loose, or missing parts that might prevent tight
latching. Make sure the secondary latch, if the vehicle
has one, keeps the hood from opening all the way when
the primary latch is released.
6-29

M
Maintenance, Replacement Parts.....................5-108
Maintenance Schedule
At Each Fuel Fill.........................................6-26
At Least Once a Year..................................6-30
At Least Twice a Year..................................6-27
How This Section is Organized....................... 6-3
Introduction.................................................. 6-2
Maintenance Requirements............................. 6-2
Part A - Scheduled Maintenance Services......... 6-4
Part B - Owner Checks and Services.............6-26
PartC-Recommended Fluids and
Lubricants...............................................6-31
PartD-Maintenance Record........................6-33
Scheduled Maintenance................................. 6-5
Scheduled Maintenance Supplements............... 6-4
Using.......................................................... 6-4
Your Vehicle and the Environment................... 6-2
Malfunction Indicator Lamp...............................3-36
Manual Transmission
Fluid..........................................................5-42
Operation...................................................2-28
Manual Windows.............................................. 2-9
Marker Lamps................................................3-16
Mirrors
Manual Rearview Mirror................................2-51
Outside Convex Mirrors................................2-52
Outside Heated Mirrors................................2-52
Outside Manual Mirrors................................2-51
Outside Power Mirrors..................................2-51
N
Navigation System, Privacy..............................7-13
New Vehicle Break-In......................................2-10
Noise Control System, Tampering......................5-70
O
Odometer......................................................3-25
Odometer, Trip...............................................3-25
Off-Road Recovery..........................................4-11
Oil
Change Engine Oil Light...............................3-39
Engine...............................5-24, 5-27, 5-28, 5-32
Low Oil Level Light......................................3-39
Pressure Gage............................................3-38
Oil, Engine Oil Life System..............5-35, 5-36, 5-38
Older Children, Restraints................................1-28
OnStar, Privacy..............................................7-13
Other Service Items
Front Wheel Bearings with
Oil-Filled Hubs.........................................5-75
Primary Fuel Filter and Water Separator.........5-73
Secondary Fuel Filter and Water
Separator/Heater......................................5-74
Outlet Adjustment............................................3-22
Outlets
Accessory Power.........................................3-19
8

Outside
Convex Mirrors............................................2-52
Heated Mirrors............................................2-52
Manual Mirrors............................................2-51
Power Mirrors.............................................2-51
Overspeed Warning Light.................................3-40
P
Paint, Damage...............................................5-93
Park Brake............................................2-38, 2-41
Parking.........................................................2-35
Brake Burnish Procedure..............................2-43
Over Things That Burn.................................2-44
Two-Speed Rear Axle..................................2-36
Part A - Scheduled Maintenance Services............ 6-4
Part B - Owner Checks and Services................6-26
PartC-Recommended Fluids and
Lubricants..................................................6-31
PartD-Maintenance Record...........................6-33
Passing.........................................................4-11
Perchlorate Materials Requirements,
California..................................................... 5-4
Power
Door Locks.................................................. 2-7
Electrical System.........................................5-96
Reduced Engine Light..................................3-42
Steering Fluid.............................................5-49
Windows...................................................... 2-9
Power Take-Off Light.......................................3-43Power Take-Off (PTO).....................................2-30
Privacy..........................................................7-11
Event Data Recorders..................................7-12
Navigation System.......................................7-13
OnStar.......................................................7-13
Radio Frequency Identification.......................7-13
R
Radio Frequency Identification (RFID),
Privacy......................................................7-13
Radio(s)........................................................3-49
Radios
Reception...................................................3-58
Setting the Clock.........................................3-48
Theft-Deterrent............................................3-57
Range Inhibit Warning Indicator........................3-31
Reading Lamps..............................................3-17
Rear Axle......................................................5-67
Differential Lock Control................................. 4-7
Shift Motor.................................................5-68
Rear Heating System......................................3-23
Rear Seat Operation.......................................1-10
Rearview Mirrors.............................................2-51
Reduced Engine Power Light............................3-42
Remote Keyless Entry (RKE) System.................. 2-3
Remote Keyless Entry (RKE) System,
Operation..................................................... 2-4
Replacement Parts, Maintenance.....................5-108
9