Question 1

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?

Accepted Answer

Technician A is correct because carrying an undeployed air bag module with the trim facing away from your body minimizes the risk of injury if it accidentally deploys. Technician B's method of carrying the module by its wires is incorrect and unsafe, as it could potentially trigger deployment.

Question 2

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

Accepted Answer

The answer of The arrow on an air bag sensor...

Question 3

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?

Accepted Answer

The answer of Technician A says that an air bag...

Question 4

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?

Accepted Answer

The answer of Technician A says if the seat belt...

Question 5

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?

Accepted Answer

The answer of Technician A says the air bag module...

Question 6

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?

Accepted Answer

Air bag systems can indeed use up to five sensors or more, depending on the complexity of the system. However, not all sensors are located in the passenger compartment; some can be found in the front, sides, or rear of the vehicle to detect impacts from different directions.

Question 7

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?

Accepted Answer

The answer of Air bag warning lamps are being discussed....

Question 8

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?

Accepted Answer

Technician B is correct because safety protocols often require that an airbag be deployed before disposal to ensure it is not accidentally activated during handling. The trim cover cannot be replaced separately as it is integral to the airbag assembly.

Question 9

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

Accepted Answer

A scan tool is the correct tool to use when testing an air bag system because it can communicate with the vehicle's onboard computer system, which controls the airbag system. It can read diagnostic trouble codes (DTCs) and monitor the status of the airbag system components.

Question 10

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?

Accepted Answer

Technician A is correct because a webbing-sensitive retractor locks when the belt is jerked. Technician B is also correct because a vehicle-sensitive retractor can be tested by braking the vehicle at low speeds.

Question 11

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?

Accepted Answer

The clockspring is actually located in the steering wheel, not at the bottom of the steering column, making Technician A's statement incorrect. Technician B is correct because the clockspring does maintain electrical continuity between the steering wheel components, such as the airbag (inflator module), and the vehicle's electrical systems.

Question 12

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?

Accepted Answer

Both technicians are correct. Codes can be indicated through the flashing of warning lamps like the air bag lamp, and a scan tool is commonly used for more detailed diagnostics.

Question 13

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

Accepted Answer

Seat belt pretensioners are designed to be replaced after activation or if they are defective. They cannot be safely rebuilt or overhauled for reuse.

Question 14

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?

Accepted Answer

The powdery residue on a deployed airbag can indeed contain sodium carbonate and cornstarch, as stated by Technician A. This is because sodium carbonate acts as a drying agent to ensure the airbag remains dry until deployment. Cornstarch or talcum powder is used to keep the airbag lubricated and prevent it from sticking together. Technician B is also correct in stating that the residue may contain sodium hydroxide, which can be a byproduct of the chemical reaction that inflates the airbag. Sodium hydroxide is created as a result of the reaction between sodium azide (used in some airbag inflators) and other compounds during the inflation process.

Question 15

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

Accepted Answer

Hall-effect type sensors are not commonly used as crash sensors in airbag systems. The other options are typical types of sensors used to detect crashes and deploy airbags.

Question 16

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?

Accepted Answer

An air bag simulator can be used to safely test air bag circuits without the risk of deployment. Back-probing connectors, as suggested by Technician B, is not a recommended practice for air bag systems due to the risk of accidental deployment or damage to the system.

Question 17

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

Accepted Answer

Adaptive airbag systems typically use the occupant's weight, seat position, and seat belt status to determine deployment intensity, not vehicle speed.

Question 18

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?

Accepted Answer

Two-stage air bags are designed to deploy with varying intensity based on the severity of the collision, meaning they may not always fully deploy if the system determines a full deployment is not necessary. Two-stage air bags can be used on both the driver's and passenger's sides, not just the driver's side.

Question 19

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?

Accepted Answer

Technician A is correct because many vehicles are equipped with a backup power supply for the airbag system, ensuring deployment even if the main battery is disconnected during a collision. Technician B's statement is incorrect as the time for the backup power supply to power down can vary and is not universally one minute after the battery is disconnected.

Question 20

The event data recorder is located ______.

Accepted Answer

The event data recorder is typically located inside the air bag diagnostic sensor assembly (ASDM), as this is where it can effectively monitor and record data relevant to the vehicle's safety systems, especially in the event of a collision.

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