1998 CHEVROLET EXPRESS sensor

Downloaded from www.Manualslib.com manuals search engine How does an air bag restrain?
In moderate to severe frontal or near-frontal collisions,
even belted occupants can contact the steering wheel or the instrument panel. Air bags supplement the protection
provided by safety belts.
Air bags distribute the force of
the impact more evenly over the occupant’s upper body, stopping the occupant more gradually. But
air bags would
not help you in many types of collisions, including
rollovers, rear impacts and side impacts, primarily because
an occupant’s motion is not toward those air bags. Air
bags should never be regarded as anything more than a supplement to safety belts, and then only
in moderate to
severe frontal or near-frontal collisions.
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.
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.
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.

Downloaded from www.Manualslib.com manuals search engine 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.
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. Don’t let anyone
start the vehicle, even to tow it, unless
the battery cables are first disconnected.
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 “Service and Owner
Publications” in the Index.
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 wires wrapped with yellow tape
or 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.

Downloaded from www.Manualslib.com manuals search engine 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 “Customer Satisfaction Procedure”
in the Index.)

Downloaded from www.Manualslib.com manuals search engine Electronic Road-Speed Governor (Gasoline Engines) (Option)
This optional system automatically controls vehicle top
speed. The system controller receives a signal from the
vehicle speed sensor and reduces power when the
vehicle speed reaches
the maximum 65 mph (105 kdh)
governed speed.
Warning Lights, Gages
and Indicators
This part describes the warning lights and gages that
may be on your vehicle. The pictures will help you
locate them.
Warning lights and gages can signal that something is
wrong before it becomes serious enough to cause an
expensive repair or replacement. Paying attention to
your warning lights and gages could also save you or
others from injury.
Warning lights come on when there may be
or is a
problem with one of your vehicle’s functions. As you
will see in the details on
the next few pages, some
warning lights come on briefly when
you start the
engine just to let you know they’re working. If you are
familiar with this section, you should not be alarmed
when this happens. Gages
can indicate when there may be or is a problem
with one
of your vehicle’s functions. Often gages and
warning lights work together
to let you know when
there’s a problem with your vehicle.
When one of
the warning lights comes on and stays on
when you are driving, or when one of the gages shows
there may be a problem, check the section that tells you
what to do about it. Please follow this manual’s advice.
Waiting to do repairs can be costly
-- and even
dangerous.
So please get to know your warning lights
and gages. They’re a big help.
Safety Belt Reminder Light
When the key is turned to RUN or START, a tone will
come on for about eight seconds to remind people to
fasten their safety belts, unless the driver’s safety belt is
already buckled.
The safety belt light will
also come on and stay on
for about
20 seconds, then it
will flash for about
55 seconds.
If the driver’s belt is already buckled, neither the tone
nor the light will come on.

Downloaded from www.Manualslib.com manuals search engine Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows AIR BAG. The system checks the
air bag’s electrical system for malfunctions. The light
tells you if there is an electrical problem. The system
check includes the air bag sensor, the air bag modules,
the wiring and the crash sensing and diagnostic module.
For more information on the air bag system, see “Air
Bag” in the Index.
AIR
BAG
This light will come on
when you start your engine,
and it will flash for a few
seconds. Then the light
should
go out. This means
the system is ready.
If
the air bag readiness light stays on after you start the
engine or comes on when you are driving, your air bag
system may not work properly. Have your vehicle
serviced right away. The
air bag readiness light should flash for
a few
seconds
when you turn the ignition key to RUN. If the
light doesn’t come on then, have it fixed
so it will be
ready to warn you if there is a problem.
Charging System Light
This light should come on
briefly
when you turn on the
ignition, before starting the
engine,
as a check to show
you it is working.
After the engine starts, the light should
go out. If it stays
on or comes on while you are driving, you may have a
problem with your charging system. It could indicate a
problem with the alternator drive belt, or some other
charging system problem. Have it checked right away.
Driving while this light is on could drain your battery.
If you must drive a short distance with this light
on, it
helps to turn off all your accessories, such as the radio
and air conditioner.
2-54

Downloaded from www.Manualslib.com manuals search engine Engine Compartment Fuse Relay Center
The fuse block is on the driver’s side of the engine
compartment at the rear.
U
NAME
IGN-B
IGN-A
BATT
LIGHTING
RR BLOWER
ENG-I
NAME
BLOWER ABS
CIRCUITS PROTECTED
Front Blower Motor
Electronic Brake Control Module AIC
SPARE
AUX A
AUX B
RH-HDLP
CIRCUITS PROTECTED
Ignition
Switch
Starter Relay, Ignition Switch
Instrument Panel
Fuse Block
Instrument Panel Fuse Block,
Headlamp Switch
Rear Auxiliary Blower Motor Relays
Heated
02 Sensors, Mass Air Flow
Sensor, EGR Valve Solenoid, Evap
Canister Purge Valve, Crankshaft
Position Sensor, Secondary Air Injection Relay (Diesel), Water in
Fuel Sensor (Diesel), Fuel Heater
(Diesel), Glowplug Relay (Diesel),
Wastegate Solenoid (Diesel)
Air Conditioning Clutch Relay
Spare Fuses
Upfitter Provisions Upfitter Provisions
Right-hand Headlamp (Export only)

Downloaded from www.Manualslib.com manuals search engine NAME
RH-HIBM
ECM-I
HORN
LH-HDLP
LH-HIBM
FUEL
SOL
IGN-E
ECM-B
CIRCUITS PROTECTED
Right-hand High-beam Headlamp
(Export only)
Ignition Coil, Camshaft Position
Sensor, VCM, Fuel Injectors, Coil
Driver
Horn Relay, Underhood Lamp(s)
Left-hand Headlamp (Export only)
Left-hand High-beam Headlamp
(Export only)
PCM, Fuel Solenoid Driver, Engine
Shutoff Solenoid
Air Conditioning Clutch Relay
Fuel Pump Relay, VCM, PCM, Fuel
Pump and Engine Oil Pressure
Switch
Replacement Bulbs
LAMP OR BULB
Sealed Beam Headlamps
Composite Low-Beam
Headlamps
Composite High-Beam
Headlamps
Front Sidemarker Lamp
Front Parking and Turn Lamp
Rear Parking Lamp
Rear Stop and Turn Lamp
Back-up Lamp
Back-up Lamp
Rear Parking, Stop, and
Turn Lamp
CHMSL
License Plate Lamp
Underhood Lamp
Reel Lamp
Reading Lamps
Sunshade Vanity Mirror
QTY NUMBER
2
H6054
2 6052
2
2
4
2
2
6
4
9005
194
2357NA 3057
3057
3 156
1156
1157
921 194
232 232
211-2
74