Deck 48: Restraint Systems: Theory, Diagnosis, and Service

Question 1

After deployment of the air bag, potentially harmful sodium hydroxide residue may be on the seats.

Answer 1

True

Question 2

Left- and right-side seat belt retractors are interchangeable.

Answer 2

False

Question 3

All the following are components of the air bag module EXCEPT:

A)the squib
B)the safing sensor
C)the explosive charge
D)the bag assembly

Answer 3

B

Question 4

Some vehicles have a switch that allows the driver's side air bag to be turned off.

Question 5

Side head protection air bags stay inflated for about five seconds to offer protection against a second or third impact.

Question 6

The approximate deployment time for most air bags is ______.

A)less than 100 milliseconds
B)about 500 milliseconds
C)about 0.5 seconds
D)less than 5 milliseconds

Question 7

The side impact air bags deploy at the same time as the front air bags.

Question 8

A pretensioner may use an explosive charge to retract the seat belt.

Question 9

The powdery substance released from the air bag when it is deployed is regular cornstarch or talcum powder.

Question 10

Seat belts can be passive- or active-type restraints.

Question 11

Always disconnect the negative battery cable and wait the recommended time before attempting any service on an air bag system.

Question 12

A live air bag must be deployed before disposal.

Question 13

An air bag will fully deploy within thirty milliseconds of impact.

Question 14

Some vehicles are equipped with two-stage force limiter type belt pretensioners.

Question 15

Technician A says that the air bag control module contains the clockspring and the inflator. Technician B says that the air bag sensing diagnostic monitor assembly (ASDM)supplies emergency current to the system if battery voltage is lost. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 16

Smart air bag systems usually have three stages of deployment.

Question 17

The purpose of the air bag diagnostic monitor is to ______.

A)supply backup power to the system
B)determine whether there is a fault in the system
C)control the operation of the air bag warning light
D)All the answers are correct.

Question 18

When placing a live air bag module on a table or bench, make sure the trim and air bag face up.

Question 19

Compressed argon gas is used on some air bag systems.

Question 20

Any seat belt that has color fading due to exposure to the sun or chemicals should be replaced.

Question 21

Air bag safety is being discussed. Technician A says to always carry an undeployed air bag module with the trim facing away from your body. Technician B says to carry the air bag module by its wires. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 22

The arrow on an air bag sensor must always face ______.

A)the location of the air bag module
B)the rear of the vehicle
C)the driver's side of the vehicle
D)the front of the vehicle

Question 23

Technician A says that an air bag module is serviced as an assembly. Technician B says that it is acceptable to replace all the sensors if one is damaged. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 24

Technician A says if the seat belt retractor does not retract when the belt is disconnected, the retractor must be replaced. Technician B says if a seat belt is cut, it must be replaced. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 25

Technician A says the air bag module can be serviced. Technician B says the inflator assembly is composed of a solid chemical gas generator containing sodium azide pellets . Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 26

Technician A says that air bag systems may use up to five sensors. Technician B says all sensors are located in the passenger compartment. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 27

Air bag warning lamps are being discussed. Technician A says an air bag system problem is indicated if the lamp is on while the engine is cranking. Technician B says on some older vehicles a jumper wire placed between two terminals of the DLC can be used to retrieve air bag system codes if a scan tool is not available. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 28

An undeployed air bag is being replaced because the trim cover is cut. Technician A says the cover can be replaced. Technician B says the air bag must be deployed before it is scrapped. Who is right?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 29

Which of the following tools should be used to test an air bag system?

A)a 12-volt test light
B)an AC-powered voltmeter
C)a scan tool
D)an AC-powered ohmmeter

Question 30

Seat belt retractors are being discussed. Technician A says that when the belt is suddenly jerked on a webbing-sensitive retractor system, the retractor should lock up. Technician B says a vehicle-sensitive retractor can only be tested by braking the vehicle at speeds of 5 to 8 MPH. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 31

Technician A says that the clockspring is located at the bottom of the steering column. Technician B says that the clockspring maintains electrical contact between the inflator module and the rest of the system. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 32

Trouble code extraction is being discussed. Technician A says codes may be flashed by the air bag lamp. Technician B says a scan tool may be used. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 33

What is the correct procedure for servicing a seat belt pretensioner?

A)send it out to be rebuilt
B)install an overhaul kit
C)replace it
D)None of the answers is correct.

Question 34

A deployed air bag has a powdery residue on it. Technician A says this powder is mainly sodium carbonate and cornstarch. Technician B says it may contain sodium hydroxide. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 35

All of the following are common air bag crash sensor types EXCEPT:

A)mass type
B)roller type
C)hall-effect type
D)accelerometer

Question 36

Air bag system service is being discussed. Technician A says an air bag simulator can be installed in place of the air bag thereby allowing accurate testing of the circuits without the fear of accidental air bag deployment. Technician B says sensors are checked by back-probing the connector. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 37

Which of the following factors is NOT used in determining the intensity of air bag deployment in an adaptive (two-stage)air bag system?

A)vehicle speed
B)the occupant's weight
C)seat position
D)status of the seat belt

Question 38

Technician A says two-stage air bags may not always fully deploy. Technician B says two-stage air bags are only used on the driver's side. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 39

Technician A says during a frontal collision, the backup power supply will deploy the air bag if the battery is disconnected. Technician B says all backup power supplies will power down one minute after the negative battery is disconnected. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 40

The event data recorder is located ______.

A)in the air bag module
B)inside the air bag diagnostic sensor assembly (ASDM)
C)in the BCM
D)in the data recorder module

Question 41

The occupant classification sensor determines the ____________________ of the passengers.

Question 42

If a seat belt will not buckle, ______.

A)use a flashlight to check the buckle for foreign objects
B)replace the seat belt assembly
C)check the fuse in the seat belt warning indicator circuit
D)lubricate the buckle mechanism with lithium grease

Question 43

Occupant classification sensors are being discussed. Technician A says the sensor uses a silicone-filled bladder in the seat cushion that has a pressure sensor connected to it. Technician B says that piezoresistive sensors are located between the seat track and the floor. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 44

Vehicle-sensitive seat belt retractors are being discussed. Technician A says the vehicle must be driven at 5 to 8 MPH to test the action of the retractors. Technician B says the retractors should lock when the brakes are applied at speeds above 8 MPH and release when the vehicle slows to less than 8 MPH. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 45

A precollision system uses _____ to detect possible collisions.

A)sonar
B)radar
C)laser ranging
D)optical ranging

Question 46

When diagnosing air bag diagnostic codes, the order in which the codes are diagnosed is ______.

A)highest to lowest
B)lowest to highest
C)first displayed to last displayed
D)last displayed to first displayed

Question 47

Most side impact air bag systems are deployed from the ____________________ or the outside of the ____________________.

Question 48

To prevent accidental deployment, most air bag systems require that at least _____ sensor switches are closed before an air bag can be deployed.

A)two
B)three
C)four
D)five

Question 49

When unbuckled, a seat belt is stowed away by the seat belt ____________________.

Question 50

The wiring harness and electrical connectors for the air bag system components are ______.

A)red
B)yellow
C)orange
D)day glow pink

Question 51

The air bag control module determines whether the seat is occupied by a child, adult, or a child in a booster seat by inputs from the _____ sensor.

A)occupant classification
B)seat belt tension
C)seat belt buckle switch
D)All the answers are correct.

Question 52

Technician A says the SIR warning light should turn on for about six seconds after the ignition is turned on and then turn off. Technician B says that if the SIR indicator is on continuously, the passenger side air bag indicator will display Off. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 53

The two types of restraint systems are air bags and ____________________.

Question 54

Second-generation air bag systems are being discussed. Technician A says a second-generation air bag inflates with about 20 to 35 percent more energy than first-generation ones. Technician B says second-generation air bags reduce the number of injuries caused by the air bag itself. Who is correc t?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 55

Technician A says a pyrotechnic-type retractor prevents the belt from coming out of the retractor when there is a sudden pull on the belt. Technician B says an inertia lock retractor uses an explosive charge to quickly tighten the belt at the start of a crash.

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 56

____________________ and ____________________ must be worn when handling a deployed air bag module.

Question 57

Technician A says when the SIR warning light is illuminated all the time, there is a fault code stored in the SIR control module. Technician B says if the warning light is on, the air bag system is turned off and the air bag will not deploy in an accident. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 58

A knee bolster is commonly used on ____________________ air bag systems.

Question 59

Which of the following is NOT a kind of safing sensor?

A)roller type
B)mass type
C)accelerometer
D)piezoresistive type

Question 60

You must wait at least _____ minutes after disconnecting the battery before working on or around the air bag system.

A)five
B)ten
C)fifteen
D)thirty

Question 61

The wiring harness and the electrical connectors for the air bag system are always ____________________.

Question 62

When disarming the air bag system for inspection of sensors, clockspring, or the air bag module, what should be done before the battery is disconnected?

Question 63

What is the first step in diagnosing an air bag fault?

Question 64

All model year ____________________ and newer vehicles must have a system that allows for air bag suppression when infants, children, or small adults are in the front passenger seat.

Question 65

Why are adaptive and two-stage air bags (second generation)used on modern vehicles?

Question 66

The ____________________ allows the electric signals from the air bag electronic control module to connect to the driver's air bag module while allowing the steering wheel to rotate freely.

Question 67

What should be done before disposing of a deployed two-stage air bag?

Question 68

What is the difference between active and passive restraint systems?

Question 69

What is an event data recorder?

Question 70

____________________ are used to tighten the seat belts at the beginning of a crash.

Question 71

What is the function of a knee bolster (knee diverter)?

Question 72

List the three functions of the air bag diagnostic monitor.

Question 73

List three types of air bag safing sensors.

Question 74

What is the distinguishing feature of "second generation" air bags?

Question 75

What are the five types of sensors used in an air bag system?

Question 76

What is the purpose of the clockspring?

Question 77

List three items to check when inspecting a seat belt.