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

Question 1

The left and right side seat belt retractors are interchangeable.

Answer 1

False

Question 2

Technician A says that the air bag control module contains the clockspring and the inflator. Technician B says that the 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

Answer 2

B

Question 3

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

Answer 3

True

Question 4

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

Question 5

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

Question 6

Smart air bag systems usually have three stages of deployment.

Question 7

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

Question 8

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 9

An air bag will be fully deployed within thirty milliseconds of impact.

Question 10

Seat belts can be both passive- and active-type restraints.

Question 11

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 12

A live air bag must be deployed before disposal.

Question 13

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

Question 14

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

Question 15

Compressed argon gas is used on some air bag systems.

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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 answers are correct

Question 21

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 22

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 23

The correct procedure for servicing a seat belt pretensioner is to ______.

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

Question 24

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 found to be damaged. Who is correct?

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

Question 25

______ gas is used to inflate an air bag module.

A) Argon
B) Nitrogen
C) Both "Argon" and "Nitrogen"
D) Neither "Argon" nor "Nitrogen"

Question 26

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 propellant. Who is correct?

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

Question 27

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 28

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 29

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) occupant's weight
C) seat position
D) status of seat belt

Question 30

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 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

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 33

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

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

Question 34

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 35

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 36

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 37

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 38

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 39

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 40

The event data recorder is located ______.

A) in the air bag module
B) inside the air bag sensor assembly [ASDM]
C) in the BCM
D) all answers are correct

Question 41

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 42

Safe service procedures of air bag systems are accomplished by following the ____________________ and by understanding the ____________________ principles of these systems.

Question 43

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

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

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. Technician B says second generation air bags reduce the number of injuries caused by the air bag itself. Who is correct?

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

Question 46

The powdery substance released from the air bag when it is deployed is ______.

A) cornstarch
B) talcum powder
C) both "cornstarch" and "talcum powder"
D) neither "cornstarch" nor "talcum powder"

Question 47

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 48

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 answers are correct

Question 49

Pyrotechnic-type pretensioners should be replaced ______.

A) every 5 years
B) every 10 years
C) after deployment of the air bag
D) never

Question 50

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 51

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

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

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

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 54

If a seat belt will not buckle, ______.

A) examine the buckle with a flashlight 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 55

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 56

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

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

Question 57

A precollision system uses _____ to detect possible collisions.

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

Question 58

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 59

A pyrotechnic-type pretensioner can be tested with a(n) ______.

A) self-powered test light
B) digital ohmmeter
C) analog ohmmeter
D) it cannot be tested

Question 60

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

Question 61

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 62

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

Question 63

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 64

What is an event data recorder?

Question 65

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

Question 66

List three types of air bag safing sensors.

Question 67

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

Question 68

On a ____________________ vehicle, the high-voltage batteries are disconnected from the electrical system when the air bag is deployed.

Question 69

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

Question 70

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

Question 71

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 72

The occupant classification sensor determines the ____________________ of the passengers.

Question 73

List the three functions of the air bag diagnostic monitor.

Question 74

What is the function of a knee bolster [knee diverter]?

Question 75

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

Question 76

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

Question 77

When unbuckled, seat belts are stowed away by seat belt ____________________.

Question 78

List three items to check when inspecting a seat belt.

Question 79

What is the purpose of the clockspring?

Question 80

What is the difference between active and passive restraint systems?