gas type GMC YUKON 2006 Owner's Manual

Your vehicle may or may not have a side impact airbag.
SeeAirbag System on page 1-74. Side impact airbags
are intended to inate in moderate to severe side
crashes. A side impact airbag will inate if the crash
severity is above the system’s designed “threshold
level.” The threshold level can vary with specic
vehicle design. Side impact airbags are not intended
to inate in frontal or near-frontal impacts, rollovers
or rear impacts. A side impact airbag is intended
to deploy on the side of the vehicle that is struck.
In any particular crash, no one can say whether an
airbag should have inated simply because of the
damage to a vehicle or because of what the repair
costs were. For frontal airbags, ination is determined
by what the vehicle hits, the angle of the impact,
and how quickly the vehicle slows down. For side
impact airbags, ination is determined by the location
and severity of the impact.
The airbag system is designed to work properly under
a wide range of conditions, including off-road usage.
Observe safe driving speeds, especially on rough
terrain. As always, wear your safety belt. SeeOff-Road
Driving on page 4-16for tips on off-road driving.What Makes an Airbag Inate?
In an impact of sufficient severity, the airbag
sensing system detects that the vehicle is in a crash.
The sensing system triggers a release of gas from
the inator, which inates the airbag. The inator,
the airbag and related hardware are all part of the
airbag modules. Frontal airbag modules are located
inside the steering wheel and instrument panel.
For seating positions with side impact airbags, there
are also airbag modules in the side of the seatbacks
closest to the door.
How Does an Airbag Restrain?
In moderate to severe frontal or near frontal collisions,
even belted occupants can contact the steering wheel
or the instrument panel. In moderate to severe side
collisions, even belted occupants can contact the
inside of the vehicle. The airbag supplements the
protection provided by safety belts. Airbags distribute
the force of the impact more evenly over the occupant’s
upper body, stopping the occupant more gradually.
But the frontal airbags would not help you in many
types of collisions, including rollovers, rear impacts,
and many side impacts, primarily because an
occupant’s motion is not toward the airbag.
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Gasoline Octane
Use regular unleaded gasoline with a posted octane
rating of 87 or higher. If the octane rating is less than 87,
you may notice an audible knocking noise when you
drive, commonly referred to as spark knock. If this
occurs, use a gasoline rated at 87 octane or higher
as soon as possible. If you are using gasoline rated
at 87 octane or higher and you hear heavy knocking,
your engine needs service.
Gasoline Specications
At a minimum, gasoline should meet ASTM
specication D 4814 in the United States or
CAN/CGSB-3.5 in Canada. Some gasolines may
contain an octane-enhancing additive called
methylcyclopentadienyl manganese tricarbonyl (MMT).
General Motors recommends against the use of
gasolines containing MMT. SeeAdditives on
page 5-5for additional information.
California Fuel
If your vehicle is certied to meet California Emissions
Standards, it is designed to operate on fuels that
meet California specications. See the underhood
emission control label. If this fuel is not available
in states adopting California emissions standards,
your vehicle will operate satisfactorily on fuels meeting
federal specications, but emission control system
performance may be affected. The malfunction
indicator lamp may turn on and your vehicle may fail
a smog-check test. SeeMalfunction Indicator Lamp
on page 3-46. If this occurs, return to your authorized
GM dealer for diagnosis. If it is determined that the
condition is caused by the type of fuel used, repairs
may not be covered by your warranty.
Additives
To provide cleaner air, all gasolines in the United
States are now required to contain additives that will
help prevent engine and fuel system deposits from
forming, allowing your emission control system to
work properly. In most cases, you should not have to
add anything to your fuel. However, some gasolines
contain only the minimum amount of additive required to
meet U.S. Environmental Protection Agency regulations.
5-5

Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 5-55.
For any bulb changing procedure not listed in
this section, contact your dealer.
Halogen Bulbs
{CAUTION:
Halogen bulbs have pressurized gas inside
and can burst if you drop or scratch the bulb.
You or others could be injured. Be sure to
read and follow the instructions on the bulb
package.
Headlamps
To replace a headlamp bulb, do the following:
1. Open the hood. SeeHood Release on page 5-11
for more information.
2. Remove the two pins on the top of the headlamp
assembly. To remove them, turn the outer pin
outward and pull it straight up. To remove the inner
pin, turn it inward and pull it straight up.
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