1999 GMC YUKON sensor

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What will you see after an air bag inflates?
After an air bag inflates, it quickly deflates, so quickly that
some people may not even realize the air bag inflated.
Some components of the air bag module
-- the steering
wheel hub for the driver's air bag, or the instrument panel
for the right front passenger's bag
-- will be hot for a short
time. The parts of the bag that come into contact with you
may be warm, but not too hot to touch. There will be
some smoke and dust coming from vents in the deflated
air bags. Air bag inflation doesn't prevent the driver from
seeing or from being able to steer the vehicle, nor does it
stop people from leaving the vehicle.
CAUTION:
When an air bag inflates, there is dust in the air.
This dust could cause breathing problems for
people with a history of asthma or other
breathing trouble. To avoid this, everyone in the
vehicle should get out as soon as it is safe to do so.
If you have breathing problems but can't get out
of the vehicle after an air bag inflates, then get
fresh air by opening a window or door.
In many crashes severe enough to inflate an air bag,
windshields are broken by vehicle deformation.
Additional windshield breakage may also occur from the
right front passenger air bag.

Air bags are designed to inflate only once. After they
inflate, you'll need some new parts for your air bag
system. If you don't get them, the air bag system
won't be there to help protect you in another crash.
A new system will include air bag modules and
possibly other parts. The service manual for your
vehicle covers the need to replace other parts.

Your vehicle is equipped with a crash sensing and
diagnostic module, which records information about
the air bag system. The module records information
about the readiness of the system, when the sensors
are activated and driver's safety belt usage
at deployment.

Let only qualified technicians work on your air bag
system. Improper service can mean that your air bag
system won't work properly. See your dealer
for service.

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NOTICE:
If you damage the covering for the driver's or the
right front passenger's air bag, the bag may not
work properly. You may have to replace the air
bag module in the steering wheel or both the air
bag module and the instrument panel for the
right front passenger's air bag. Do not open or
break the air bag coverings.
If your vehicle ever gets into a lot of water -- such as
water up to the carpeting or higher
-- or if water enters
your vehicle and soaks the carpet, the air bag controller
can be soaked and ruined. If this ever happens, and then
you start your vehicle, the damage could make the air bags
inflate, even if there's no crash. You would have to replace
the air bags as well as the sensors and related parts. If your
vehicle is ever in a flood, or if it's exposed to water that
soaks the carpet, you can avoid needless repair costs by
turning off the vehicle immediately and disconnecting the
battery cables. Don't let anyone start the vehicle under any
circumstances. See your dealer for service.
Servicing Your Air Bag-Equipped Vehicle
Air bags affect how your vehicle should be serviced.
There are parts of the air bag system in several places
around your vehicle. You don't want the system to
inflate while someone is working on your vehicle. Your
dealer and the GM Service Manual have information
about servicing your vehicle and the air bag system. To
purchase a service manual, see ªService and Owner
Publicationsº in the Index.
CAUTION:
For up to 10 minutes after the ignition key is
turned off and the battery is disconnected, an air
bag can still inflate during improper service. You
can be injured if you are close to an air bag when
it inflates. Avoid yellow connectors. They are
probably part of the air bag system. Be sure to
follow proper service procedures, and make sure
the person performing work for you is qualified
to do so.
The air bag system does not need regular maintenance.

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1-30 Adding Equipment to Your Air
Bag-Equipped Vehicle
Q:If I add a push bumper or a bicycle rack to the
front of my vehicle, will it keep the air bags
from working properly?
A:As long as the push bumper or bicycle rack is
attached to your vehicle so that the vehicle's basic
structure isn't changed, it's not likely to keep the
air bags from working properly in a crash.
Q:Is there anything I might add to the front of the
vehicle that could keep the air bags from
working properly?
A:Yes. If you add things that change your vehicle's
frame, bumper system, front end sheet metal or
height, they may keep the air bag system from
working properly. Also, the air bag system may not
work properly if you relocate any of the air bag
sensors. If you have any questions about this, you
should contact Customer Assistance before you
modify your vehicle. (The phone numbers and addresses for Customer Assistance are in Step Two
of the Customer Satisfaction Procedure in this
manual. See ªCustomer Satisfaction Procedureº in
the Index.)
Rear Seat Passengers
It's very important for rear seat passengers to buckle up!
Accident statistics show that unbelted people in the rear
seat are hurt more often in crashes than those who are
wearing safety belts.
Rear passengers who aren't safety belted can be thrown
out of the vehicle in a crash. And they can strike others
in the vehicle who are wearing safety belts.
Rear Seat Outside Passenger Positions

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2-14 Shock Sensor
A shock sensor triggers the alarm when it detects a blow
to your vehicle. It is located in the center floor console.
There are two levels of alarms via the shock sensor: two
horn blasts and the headlamp/parking lamps flash for
non
-threatening blows to the vehicle or a full
two
-minute alarm for harder blows to the vehicle. Its
sensitivity can be adjusted if more or less sensitivity is
desired. If sensitivity is increased too much, it may give
false alarms caused by gusts of wind or other natural
events that may shake the vehicle.
The adjustment for the
shock sensor sensitivity can
be accessed through a hole
in the forward wall of the
main bin of the center
floor console.
Using a small flat
-tipped screwdriver, turn the adjuster
clockwise to increase sensitivity and turn counterclockwiseto decrease sensitivity. The shock sensor is ignored by the
alarm system when the ignition is on, when the tailgate or
panel doors are open, when the alarm is disarmed, when
customized to be ignored and for five seconds after the
horn sounds an alarm or chirp. The shock sensor is
ignored after triggering three full alarms until the system
is rearmed.
Arming the System
The alarm system can be armed to detect break-ins by
locking your vehicle using the keyless entry or by
locking the doors with the power door lock switch.
Passive arming is also available if you would like the
system to arm all by itself after the doors have been
closed for a short time. See ªFeature Customizationº in
the Index. When the system is armed, a red light will
flash on the center floor console briefly once every two
seconds. If you return to your vehicle and the red light is
flashing two brief flashes every two seconds, the system
is armed and the shock sensor had triggered a two
minute alarm. If the red light is flashing three times
every two seconds, the system is armed and there was an
intrusion that sounded the alarm.
Horn chirps and parking lamp flashes can be set to
your choice.

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Remote Keyless Entry Transmitter Locking
If all the doors are closed, locking the vehicle with the
transmitter will immediately arm the system. The horn
will chirp twice and the headlamps and parking lamps
will flash, confirming that the system is armed if that
mode is selected. If any door is open when the
transmitter LOCK button is pressed, the system goes
into an armed wait mode, waiting for the doors to close.
Once they are closed, the system will arm and the
headlamps and parking lamps will flash. If the tailgate
or panel doors are open or ajar at the time the system is
arming, the headlamps and parking lamps flash once.
Power Door Lock Switch Locking
If any door is open when the power door lock switch is
pressed, the system goes into an armed wait mode,
waiting for the doors to close. Once they are closed, the
system will arm and the parking lamps will flash. If both
of the doors are closed when the power lock switch is
pressed, the system assumes you are inside the vehicle,
so it will not arm. Locking the doors by using the
manual door locks will not arm the system.Passive Arming
If the LOCK button on the keyless entry transmitter or
the power door lock switch is pressed, the system will
arm immediately. If the ignition was just turned off and
a door was opened, the system will arm six seconds after
the doors, tailgate or panel doors are closed, whether or
not you lock them with the manual door lock. If a door
is opened without the ignition being turned on, the
system will wait 30 seconds after the doors, tailgate or
panel doors are closed before arming, allowing you time
to get into the vehicle and put the key in the ignition.
The parking lamps will flash when the system arms.
Passive arming is not enabled from the factory.
Disarming the System
There are two ways to disarm the system:
1. Press the UNLOCK button on the keyless entry
transmitter. If the horn chirps two or three times
when you unlock the vehicle, the alarm sounded in
your absence. Two chirps means that the shock
sensor was set off and three chirps means that a door,
tailgate or the panel doors were opened.
2. Turn the ignition to RUN with the proper key.
For more information on customizing the features
mentioned here, see ªFeature Customizationº in the Index.

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2-16 Turning Off the Alarm
If you started the alarm by pressing the panic button on the
keyless entry transmitter, you must either push that button
again or turn the ignition to RUN to stop the alarm.
If the alarm is sounding due to the shock sensor or a
door, tailgate or panel door opening, it can be turned off
by either turning the ignition switch with a proper key
inserted or by pressing any button on the keyless entry
transmitter. If you use your keyless entry transmitter to
silence the alarm, additional things will happen
depending upon which button you press.

Pressing the UNLOCK button will turn the alarm
off, unlock the driver's door and disarm the system.

Pressing the LOCK button will turn the alarm off,
keep the doors locked and keep the system armed.

Pressing the REAR 2X button will turn the alarm off
and disarm the system.

Pressing the panic button will turn the alarm off,
keep the doors locked and keep the system armed.
If the alarm is sounding because an incorrect ignition
key was used, press any button on the keyless entry
transmitter to turn the alarm off.
The alarm will stop by itself after two minutes.
Feature Customization
Your vehicle's locks and lighting systems can be
programmed with several different features. The following
list tells you the features that can be programmed.

Lockout Prevention

Keyless Entry Verification

Theft
-Deterrent Arming Method

Theft
-Deterrent Arming Verification

Driver's Door Alarm Delay
To program features, your vehicle must be in the
programming mode. Follow these steps:
1. Put your key in the ignition.
2. Turn the ignition to RUN to disarm the
theft
-deterrent system.
3. Turn the ignition to OFF.
4. Remove the RADIO fuse (Fuse 17). This fuse is in
the main fuse block, located on the left side of your
instrument panel. When the main fuse block is open,
the RADIO fuse (Fuse 17) is located in the lower
right corner side of the fuse panel. See ªFuses and
Circuit Breakersº in the Index.

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5. Turn the ignition to ACCESSORY.
You should hear two chimes to verify that the system
is in programming mode. You will also be able to set
Keyless Entry Verification, Arming Method, Arming
Verification, Driver's Door Delay, Shock Sensor
Enable and Lockout Prevention.
Lockout Prevention
Your vehicle comes with this feature set in Mode 2. This
means that your power door locks will not lock when
the keys are in the ignition and a door is open. To
change the factory setting, do the following:
1. Press the LOCK switch on the door.
2. Count the number of chimes you hear. The number
of chimes tells you which mode your vehicle is
set for.
3. Press the LOCK switch on the door until you hear
the number of chimes that correspond to the mode
selection you want.
Mode 1: Both Off (Doors will lock/unlock when you
press the power door lock switch).
Mode 2: Lockout Prevention Enabled
Keyless Entry Verification
Your vehicle comes with this feature set in Mode 5. This
means that when you use the keyless entry transmitter to
lock/unlock your vehicle, your headlamps and parking
lamps will flash briefly upon the first press on LOCK.
Your horn will sound briefly and your headlamps and
parking lamps will flash briefly upon the second press
on LOCK. Your headlamps and parking lamps will flash
briefly upon any press on UNLOCK. To change the
factory setting, do the following:
1. Press the UNLOCK button on the keyless
entry transmitter.
2. Count the number of chimes you hear. The number
of chimes tells you which mode your vehicle is
set for.
3. Press the UNLOCK button on the keyless entry
transmitter until you hear the number of chimes that
correspond to the mode selection you want.
Mode 1: All Off (The headlamps will not flash and the
horn will not sound to provide you feedback that a
lock/unlock command has been received by the keyless
entry transmitter.)

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Your console also has a
cupholder that swings down
for the rear seat passengers
to use.
The console also contains the following components:

Rear Seat Audio System Controls

Rear Heated Seat Switches

Rear Seat Accessory Power Outlet

Six
-Disc CD Changer

Subwoofer

Audio Amplifier
Shock Sensor Adjuster

LED (Light Emitting Diode) Theft
-Deterrent
System Indicator

Cellular Telephone (If Equipped)
For more information on these components, please see
the Index for that item.
Armrest Storage Compartment
Your vehicle has a center armrest storage compartment
in the rear seat.
Other Storage Compartments
Your vehicle includes a number of storage
compartments for storage of often
-used items.
Your vehicle has a storage pocket on each of the front
doors. You can use the pocket to store a variety of
small items.