Diesel Engine Exhaust Brake
The exhaust brake is available on vehicles equipped
with a diesel engine. It is located in the exhaust system.
The exhaust brake is used to help slow the vehicle
and may assist the vehicle’s foundation brakes. The use
of the exhaust brake will assist the braking of the
vehicle and prolong the life of the foundation brake
lining material.
The exhaust brake switch
is located in the instrument
panel switchbank.
Push the bottom of the switch to turn the exhaust brake
on. When you push the top of the switch, the exhaust
brake will turn off.There is an indicator light on the instrument panel
similar to the symbol on the switch, that will come on
when the exhaust brake is active. SeeExhaust
Brake Indicator Light on page 3-40for more information.
When using the exhaust brake, the proper gear range
selection is important. The exhaust brake will be
most effective if the gear range selected is the lowest
possible range that does not allow the engine rpm to go
more than 200 rpm above rated (full load) rpm. If you
have a Caterpillar
®diesel engine, do not exceed
2900 rpm. If you have a DURAMAX™ (LG4) diesel
engine, do not exceed 2400 rpm. If you have a
DURAMAX™ (LB7) diesel engine, do not exceed
3600 rpm.
If you have an automatic transmission and press this
button, the transmission will downshift to a factory
default setting of fourth gear. To change the default
setting, or for more information on factory default
settings, contact your dealer for assistance.
The accelerator and clutch pedals must be released in
order for the exhaust brake to engage. The exhaust
brake will not function when the cruise control feature is
active, and will automatically shut off when the
anti-lock brake system is active.
2-25
Tilt Wheel
A tilt wheel allows you to adjust the steering wheel
before you drive. You can raise it to the highest level to
give your legs more room when you exit and enter
the vehicle.
The lever that allows you to tilt the steering wheel is
located on the left side of the steering column.
To tilt the wheel, hold the wheel and pull the lever. Then
move the wheel to a comfortable position and release
the lever to lock the wheel in place.
Turn Signal/Multifunction Lever
The lever located on the left side of the steering column
includes the following:
•Turn and Lane-Change Signals
•Headlamp High/Low-Beam Changer
•Windshield Wipers
•Windshield Washer
•Cruise Control (Option)
3-7
Cruise Control
If your vehicle has this
feature, it is located at the
end of the multifunction
lever.
T(Set):Pressing in this button at the end of the
lever sets the cruise control speed.
9(Off):Moving the switch to this position turns off
the cruise control.
R(On):Moving the switch to this position turns on the
cruise control.
S(Resume/Accelerate):Moving the switch to this
position turns on resume/accelerate.With cruise control, you can maintain a speed of about
30 mph (48 km/h) or more without keeping your foot
on the accelerator. Cruise control does not work
at speeds below about 30 mph (48 km/h).
If you have an automatic transmission and you apply
your brakes, the cruise control will shut off.
If you have a manual transmission and you apply your
brakes or push the clutch pedal, the cruise control
will shut off.
{CAUTION:
Cruise control can be dangerous where you
can not drive safely at a steady speed. So, do
not use your cruise control on winding roads
or in heavy traffic.
Cruise control can be dangerous on slippery
roads. On such roads, fast changes in tire
traction can cause needless wheel spinning,
and you could lose control. Do not use cruise
control on slippery roads.
3-10
Setting Cruise Control
{CAUTION:
If you leave your cruise control on when you
are not using cruise, you might hit a button
and go into cruise when you do not want to.
You could be startled and even lose control.
Keep the cruise control switch off until you
want to use cruise control.
1. Move the cruise control switch to on.
2. Get up to the speed you want.
3. Press in the set button at the end of the lever and
release it.
4. Take your foot off the accelerator pedal. The
accelerator pedal will not go down.
Resuming a Set Speed
Suppose you set your cruise control at a desired speed
and then you apply the brake. This, of course, shuts
off the cruise control. But you don’t need to reset it.Once you’re going about 30 mph (48 km/h) or more, you
can move the cruise control switch briefly from on to
resume/accelerate.
The vehicle will return to your chosen speed and
stay there.
If you hold the switch at resume/accelerate, the vehicle
will keep going faster until you release the switch or
apply the brake. So unless you want to go faster, don’t
hold the switch at resume/accelerate.
Increasing Speed While Using Cruise
Control
There are two ways to go to a higher speed:
•Use the accelerator pedal to get to the higher
speed. Press the button at the end of the lever, then
release the button and the accelerator pedal.
You’ll now cruise at the higher speed.
•Move the cruise switch from on to
resume/accelerate. Hold it there until you get up to
the speed you want, and then release the switch.
To increase your speed in very small amounts,
move the switch briefly to resume/accelerate. Each
time you do this, your vehicle will go about
1 mph (1.6 km/h) faster.
3-11
Reducing Speed While Using Cruise
Control
Press in the button at the end of the lever until you
reach the lower speed you want, then release it.
To slow down in very small amounts, tap the button
briefly. Each time you do this, you’ll go 1 mph (1.6 km/h)
slower.
Passing Another Vehicle While Using
Cruise Control
Use the accelerator pedal to increase your speed.
When you take your foot off the pedal, your vehicle will
slow down to the cruise control speed you set earlier.
Using Cruise Control on Hills
How well your cruise control will work on hills depends
upon your speed, load and the steepness of the
hills. When going up steep hills, you may want to step
on the accelerator pedal to maintain your speed.
When going downhill, you may have to brake or shift to
a lower gear to keep your speed down. Of course,
applying the brake or clutch takes you out of cruise
control. Many drivers find this to be too much trouble
and don’t use cruise control on steep hills.
Ending Cruise Control
There are four different ways to turn off the cruise
control:
•Step lightly on the brake pedal (manual and
automatic transmissions).
•Press the clutch pedal to the floor (manual
transmissions).
•Move the cruise switch to off, or
•Shift the transmission to NEUTRAL (N).
Erasing Speed Memory
When you turn off the ignition, your cruise control set
speed memory is erased.
3-12
Compact Disc Messages..................................3-56
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-35
Heater, Engine............................................2-23
Low Warning Light.......................................3-36
Surge Tank Pressure Cap.............................5-35
Cooling System..............................................5-38
Cooling System Capacity.................................5-94
Cruise Control................................................3-10
Current and Past Model Order Forms.................. 7-8
Customer Assistance Information
Customer Assistance for Text Telephone
(TTY) Users.............................................. 7-3
Customer Assistance Offices........................... 7-3
Customer Satisfaction Procedure..................... 7-2
Reporting Safety Defects to General Motors...... 7-7
Reporting Safety Defects to the Canadian
Government.............................................. 7-7
Reporting Safety Defects to the United
States Government.................................... 7-6
Roadside Assistance Program......................... 7-4
Service Publications Ordering Information......... 7-7
D
Daytime Running Lamps..................................3-14
Daytime Running Lamps Indicator Light.............3-41
Defensive Driving............................................. 4-2Defogging and Defrosting.................................3-20
Defroster Check..............................................6-27
Diesel Engine
Exhaust Brake............................................2-25
Fuel............................................................ 5-8
Starting......................................................2-14
Starting Your DURAMAX™...........................2-19
Diesel Engine Warm-Up...................................2-16
Differential Lock Control, Inter-Axle....................4-10
Differential Lock Control, Rear Axle...................4-10
Differential Lock Indicator Light.........................3-40
Doing Your Own Service Work........................... 5-4
Dome Lamps.................................................3-15
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Door Latches Check........................................6-27
Double-Clutching.............................................2-30
Driver
Position, Safety Belt.....................................1-13
Driving
At Night.....................................................4-17
City...........................................................4-21
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-22
Hill and Mountain Roads..............................4-23
In Rain and on Wet Roads...........................4-18
Winter........................................................4-25
4