
The traction control system is enabled every time your
vehicle is started. The system will activate if it senses
that any of the wheels are spinning or beginning to lose
traction.
You may hear or feel the system working or notice a
lack of accelerator response, but this is normal.
The Traction Assist System may operate on dry roads
under some conditions. When this happens, you may
notice a reduction in acceleration. This is normal and
doesn’t mean there’s a problem with your vehicle.
Examples of these conditions include a hard acceleration
in a turn, an abrupt upshift or downshift of the
transmission or driving on rough roads.
If your vehicle is in cruise control when the TAS begins
to limit wheel spin, the cruise control will automatically
disengage. When road conditions allow you to safely
use it again, you may re-engage the cruise control.
SeeCruise Control on page 3-10.
When the traction off light
is on, the TAS is off and
will not limit wheel
spin. Adjust your driving
accordingly.The traction off light will come on under the following
conditions:
The Traction Assist System is turned off, either by
pressing the TAS on/off button, located on the
instrument panel, or by turning off the automatic
engagement feature of the TAS.
The transmission is in FIRST (1); TAS will not
operate in this gear. This is normal.
The vehicle is driven on an extremely rough road.
When the vehicle leaves the rough surface, slows
down or stops, the light will go off and TAS will turn
on again. This is normal.
A Traction Assist System, Anti-Lock Brake System
or engine-related problem has been detected and
the vehicle needs service.
If the vehicle has been driven with the TAS system
on for long periods of time, or if the vehicle has
gone through many several high speed braking
maneuvers the system may be automatically
disabled. The system will automatically re-enable
after approximately two minutes of not using
the brakes.
SeeTraction Off Light on page 3-41.
4-9

Preset Mode:PTO speed control mode is used for
stationary applications. (PTO will remain engaged while
mobile in the preset mode, however PTO set and
resume speed controls will be inoperative.) This mode
provides a default standby speed of 800 or 850 rpm
(depending on the engine/transmission combination) and
two default PTO control speeds which follow:
1. PTO Set Speed of 1,250 rpm, or
2. PTO Resume Speed of 1,700 rpm.
Please note that the standby speed (800/850 rpm) is
not to be used as a PTO control speed. Vehicles
not equipped with cruise control will not have the
resume speed capability.
To use PTO speed control in variable mode
(while mobile) do the following:
1. Engage the PTO.
2. Vehicle speed must be greater than 5 mph.
3. Make sure your foot is off the brake pedal (and off
the clutch for vehicles equipped with a manual
transmission).
4. Select the desired engine speed by using the foot
pedal, and select SET on the PTO switch or the
cruise control.To use PTO speed control in variable mode
(while stationary) do the following:
1. Engage the PTO.
2. Vehicle speed must be less than 5 mph.
3. Make sure your foot is off the brake pedal (and off
the clutch for vehicles equipped with a manual
transmission).
4. Select the desired engine speed by using the foot
pedal, and select SET on the PTO switch or the
cruise control.
Variable Mode:PTO speed control mode can be used
for both stationary and mobile applications. This mode
allows PTO to be controlled in a fashion similar to
how cruise control sets vehicle speed. The operator can
set to an rpm (between 800 and 2,200) with the
cruise control feature or with the SET position on the
PTO switch. The operator is then able to increase rpm in
increments of 100, or “tap up” with the resume position
on the cruise control. The operator can also decrease
rpm in increments of 100 with the SET switch on
the PTO or the cruise control.
Vehicles not equipped with cruise control will not have
the “tap up” capability.
4-102

Fuses Usage
TBC ACCYTruck Body Controller
Accessory
IGN 3 Ignition, Heated Seats
4WDFour-Wheel Drive System,
Auxiliary Battery
HTR A/C Climate Control System
LOCK (Relay)Power Door Lock Relay
(Lock Function)
HVAC 1 Climate Control System
L DOORDriver’s Door Harness
Connection
CRUISECruise Control, Power Take
Off (PTO)
UNLOCK (Relay)Power Door Lock Relay
(Unlock Function)
RR FOG LP Not Used
BRAKE Anti-Lock Brake SystemFuses Usage
DRIVER UNLOCKPower Door Lock Relay
(Driver’s Door Unlock
Function)
IGN 0 TCM
TBC IGN 0 Truck Body Controller
VEH CHMSLVehicle and Trailer High
Mounted Stoplamp
LT TRLR ST/TRN Left Turn Signal/Stop Trailer
LT TRNLeft Turn Signals and
Sidemarkers
VEH STOPVehicle Stoplamps, Brake
Module, Electronic Throttle
Control Module
RT TRLR ST/TRN Right Turn Signal/Stop Trailer
RT TRNRight Turn Signals and
Sidemarkers
BODY Harness Connector
5-125

Coolant
Engine Temperature Gage............................3-42
Heater, Engine............................................2-25
Surge Tank Pressure Cap.............................5-38
Cooling System..............................................5-40
Cruise Control................................................3-10
Cruise Control Light........................................3-47
Cupholder(s)..................................................2-75
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text
Telephone (TTY) Users............................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-5
Reporting Safety Defects to General Motors....7-11
Reporting Safety Defects to the Canadian
Government............................................7-11
Reporting Safety Defects to the United States
Government............................................7-10
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-11
D
Daytime Running Lamps..................................3-14
Defensive Driving............................................. 4-2
Delayed Locking.............................................2-10Doing Your Own Service Work........................... 5-4
Dome Lamp Override......................................3-18
Dome Lamps .................................................3-17
Door
Delayed Locking..........................................2-10
Locks.......................................................... 2-8
Power Door Locks......................................... 2-9
Programmable Automatic Door Locks.............2-11
Rear Door Security Locks.............................2-13
Rear Doors.................................................2-14
Driver
Position, Safety Belt.....................................1-15
Driver Information Center (DIC).........................3-50
DIC Operation and Displays..........................3-51
DIC Vehicle Customization............................3-63
DIC Warnings and Messages........................3-54
Driving
At Night.....................................................4-35
City ...........................................................4-38
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-39
Hill and Mountain Roads..............................4-42
In Rain and on Wet Roads...........................4-36
Off-Road ....................................................4-20
Recovery Hooks..........................................4-49
Rocking Your Vehicle to Get it Out.................4-48
Winter........................................................4-44
4

Hill and Mountain Roads..................................4-42
HomeLink®Wireless Control System..................2-70
HomeLink®Wireless Control System Operation.....2-71
Hood
Checking Things Under................................5-12
Release.....................................................5-13
Horn ............................................................... 3-6
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-15
Hydraulic Clutch.............................................5-34
I
Ignition Positions.............................................2-22
Infants and Young Children, Restraints...............1-32
In ation -- Tire Pressure..................................5-80
Instrument Panel
Overview..................................................... 3-4
Instrument Panel (I/P)
Brightness..................................................3-17
Cluster.......................................................3-32
J
Jump Starting.................................................5-52
K
Keyless Entry System....................................... 2-5
Keys............................................................... 2-3
L
Labelling, Tire Sidewall....................................5-74
Lamps
Auxiliary Roof Mounted Lamp........................3-17
Cargo........................................................3-19
Dome ........................................................3-17
Dome Lamp Override...................................3-18
Fog ...........................................................3-16
Front Reading.............................................3-18
LATCH System
Child Restraints...........................................1-45
Securing a Child Restraint Designed for
the LATCH System...................................1-47
Latches, Seatback............................................ 1-8
Light
Airbag Off..................................................3-34
Airbag Readiness........................................3-34
Anti-Lock Brake System Warning...................3-41
Battery Warning..........................................3-38
Brake System Warning.................................3-40
Cruise Control.............................................3-47
Four-Wheel-Drive.........................................3-48
7