ATASA 5 Restraint Systems...Inertia, Pyromania Inertia, Def Leppard 6. Pretensioners can be _ lock or _ type with a small explosive charge. ATASA 5 th Restraint Systems ATASA

ATASA 5 th Study Guide Chapter 24 Pages 704724 Restraint Systems 73 Points

Be Certain to Read the Summary

ATASA 5 th Restraint Systems

1. Safety features available as standard equipment on passenger vehicles include: side _________barriers, ___________ zones in the body, a rigid occupant cell, seat belts, ___________ brakes, _____________ control, _____________ control, and ______ _______. (front, rear, side, curtain)

Impact, Crumple or Crush, Antilock, Traction, Stability, Air Bags


2. An ___________ restraint system is one that the vehicle’s occupant must make a manual effort to use.

Active Passive Automatic


3. A ___________________ restraint system operates automatically through no action of the occupant.


Active Passive Automatic

4. Most vehicles have 2 active belts; 1) a _____ belt and 2) a ___________ belt.


Lap, Midrange Lap, Shoulder Lap, Back

5. Seat belt retractors also work as _____________ to take up slack during an accident, limiting the forward movement of the occupant’s body.


Stabilizer Posttensioner Pretensioner

6. Pretensioners can be _____________ lock or ________________ type with a small explosive charge.


Inertia, Pyrotechnic Inertia, Pyromania Inertia, Def Leppard

6. Pretensioners can be _____________ lock or ________________ type with a small explosive charge.


ATASA 5 th Restraint Systems Officially called SPR4 (Snake Pretensioner Retractor), the system comprises a plastic piston instead of conventional metal components to transfer tensioning torque, this meaning in turn that a simpler and lighter weight design has been achieved.

"The pyrotechnical seat belt pretensioner has been an established product for nearly 30 years, but TRW has taken this concept to a new level,” said Harold Lutz, director engineering, TRW seat belt systems.


Some vehicles have the fuel pump inertia switch wired to cut off passive, seat belt restraint system power as well as the fuel pump power feed in case

of a collision…but not the air bag system power.





7. A __________ lamp, buzzer, or _______ warns occupants in both front seats to buckle up!

Warming, Chime Warning, Chime Whipping, Chime


8. When servicing seat belts: keep sharp edges from damaging any part of the belt ____________, and avoid bending or damaging the belt buckle or latch plate. Do not attempt repair on the belt ________________ mechanisms, always replace them with new parts. Properly torque all of the __________ bolts as specified by the manufacturer.

Replace, don’t’ repair any questionable part!

Webbing, Tensioner, Anchor Quilting, Tensioner, Head Upholstery, Tensioner, Mounting


9. Air bag are designed to be used ________ seat belts, not to take the place of them. Buckle Up!

With Without Instead of



10. The complete air bag event from impact to deployment takes ____ milliseconds. 70/1000of a sec


7 70 700




11. The nitrogen gas to inflate or deploy an air bag is fired by an igniter commonly called a __________.


Squab Squad Squib


12. Air bag systems are abbreviated SIR for: and SRS for:


sup∙ple∙ment (s p l m nt) n.

1. Something added to complete a thing, make up for a deficiency, or extend or strengthen the whole.

13. Passenger side air bags need a greater _______________ of gas to inflate. They are able to be switched to the off position by the driver if a rearfacing child seat or a small child is seated up front.


Capacity Volume Area

14. Knee _________ or knee ____________ prevent the occupant from sliding under the air bag.


Bolsters, Diverters Bleachers, Diverters Polsters, Diverters


15. Side ____________ air bags blanket the entire side of the car for side head protection in a collision.


Certain Curtain Puritan




16. Side curtain air bags deploy in about ___ to ___ mSec and stay inflated for about ___ seconds.


56 mSec 1020 mSec 5090 mSec

5 10 15

17. “Smart” or ___________ air bags match the deployment to the occupant’s weight & severity of the impact. They even take into account seat position and seat belt use to vary the deployment rate.


Advantageous Reactive Adaptive

18. _______stage air bags have twin bags, chambers of gas, and squibs to phase in full deployment.


Two Four Six

19. The electrical circuit of an air bag system includes ___________ sensors & a control module. (ECM)


Impact Arming Safing

20. SIR/SRS electrical systems require at least __ sensor switches to be closed for an air bag to deploy.


2 20 1

21. The ______ or discriminating sensor is located in the engine compartment on the radiator support.

Infact Impact Detract


22. The _______ or arming sensor in the passenger compartment determines if the collision is severe enough to deploy the air bag.

(“disarm” is to SIR as “inhibit” is to ABS)

Safing Chafing Erasing


23. Impact or safing sensors can be __________ type, _______ type or ________________, a piezo device that is distorted during a collision & generates an analog voltage as a signal.


Roller, Mass, Accelerometer

24. The ______ position sensor adjusts air bag deployment to be softer if the seat is farther forward


Treat Seat Meat

25. The seat ________ switch does more than just warn the driver to buckle up. It is used to adjust the force of the air bags if the driver is not buckled up. You should always buckle up!


26. The __________ ___________ sensor detects the weight of the passenger through the pressure exerted on a sensor bladder or siliconefilled mat in the seat cushion. This sensor can discriminate between the weight of a child and the weight of an adult.


Occupant Classification

27. Child seats must always be installed in the ____________ seats, since a deploying passenger side, front air bag could kill a baby or small child.

Never carry a child on your lap while driving!


Front Middle Rear

When two sensors are closed, the igniter circuit completes to start the chemical chain reaction that produces enough heat to produce the nitrogen gas used to inflate the air bag.


28. The airbag sensing diagnostic monitor (ASDM) constantly monitors the system ________________. It also supplies backup power for up to 30 minutes after the battery has been disconnected!

Diagnostics Readiness Faults


Any fault in the SIR/SRS system will disarm the system from operating, set a DTC, and illuminate the readiness lamp on the instrument panel.

The system self checks at every ignition key cycle.

(“disarm” is to SIR as “inhibit” is to ABS)


The diagnostic module also supplies backup power to the air bag module in the event that the battery or battery cables are damaged

during impact. This charge can last for up to 30 minutes!


Backup power must be depleted before any air bag service is performed! To do this, disconnect the positive battery cable & wait at least 30 minutes before

removing the air bag.


29. SRS has bright __________ connectors that are _________ plated and have shorting bars called “activation prevention mechanisms” to prevent accidental deployment during service.

Yellow, Gold Orange, Copper Green, Aluminum


30. The ___________________ is a wound up coil of flat wiring found under the air bag module in the steering column used to conduct electricity to the air bag regardless of steering wheel position.

Clock Spring Leaf Spring Alarm Spring



31. The ________________ light turns on briefly during the system selfcheck at start up. If the light stays on there is a fault in the system.

A blinking light may be communicating Lamp Fault Codes. (LFCs)

Readiness Steadiness Deployment


32. The air bag module is the ______ ______ and the ___________ assembly packed into a single unit.

Air Bag, Inflator Air Bag, Clockspring Air Bag, Horn


33. An explosive release of ______________ gas is what typically inflates a driver’s side air bag.

Nitrogen Hydrogen Oxygen


34. The igniter starts a _________________ reaction to inflate the bag.

Mechanical Chemical Nuclear


35. At the center of the igniter assembly is the ________ which contains zerconic potassium perchlorate.

ZPP Sodium Azide, Squib


36. The ZPP ignites a generant containing ____________ azide and potassium nitrate which in turn produces the nitrogen that inflates the air bag.


Titanium Sodium Squib

37. Some passenger and sideimpact air bags use a solid propellant and inert _________ gas to deploy.


Argon Hydrogen Oxygen

38. The air bag itself is a thin __________ fabric lubricated with cornstarch or talcum power.

Nylon Neoprene Viton


39. When the air bag readiness light is constantly lit, a system fault exists and a ______ is set. If the light remains on and the system has one or more DTCs, the air bags are inhibited from operating.


DLC EGR DTC

40. ____digit codes are shown by the blinking light. ____digit codes can be retrieved with a scan tool.


2, 5 3, 6 5, 7

41. SIR/SRS DTCs ___________ be cleared with a scan tool. When the system is repaired and the selftest has been run, only then the codes will be “self cleared” by the module.


Cannot!

Airbag warning lights are exactly that...a warning that the airbag system is not operating properly. When they illuminate, the system is inactive. That means the airbags will not deploy if

you are in an accident.

42. For diagnostic purposes, and air bag __________ can be installed in place of the air bag to test and proveout the operation of sensors, wiring , and the diagnostic module.


Simulator Stimulator Emulator

43. Depowering the ____________ ____________ module prevents accidental deployment during repair.


Reserve Energy Reserve Battery Reserve Sargeant

Once it's charged, the capacitor has the same voltage as the battery (1.5 volts on the battery means 1.5 volts on the capacitor). For a small capacitor, the capacity is small. But large capacitors can hold quite a bit of charge. You can find capacitors as big as soda cans that hold enough charge to light a flashlight bulb for a minute or more.


44. Do not strike or jar a ____________ connected to the system.


Actuator Sensor Air Bag

Occupant classification system to adjust deployment based on the mass (weight) of the driver. (<33 lbs., 34110 lbs., 111 lbs. & above)



45. When carrying a live air bag, face the trim ________ from your body and when placing a live module on a bench, face the trim & the air bag upward.


46. Safety glasses and _____________ must be worn when handling deployed bags to protect from the sodium hydroxide dust. Wash your hands after handling a deployed air bag.


47. Disposal of deployed air bags is strictly controlled by manufacturers and by the ______.


OSHA EPA DOT DMV ARMY

48. Never use a selfpowered_____ _______ to test an air bag or a SIR system.


Scan Tool DMM Test Light

49. Special attention to indexing the position of the steering column _______________ is important whenever a steering column is serviced. Never freely rotate a column removed from the vehicle more than the clockspring can handle. The conductive ribbon will be damaged.


Clock Spring Leaf Spring Coil Spring

50. Other protective equipment on the vehicle includes _______________, some of which are active.


Foot Stools Head Rests Seat Cushions

51. Vehicles have an SRS ________ ________ _________ (EDR) that records data from a crash or a near crash including BPP, TPS, VSS, RPM, transmission range, seat position & seat belt status.


Event Data Recorder EVAP Delivery Room Event Day Recorder

52. _____________ systems predict possible collisions using millimeter wave radar sensors and ready the vehicle by pretensioning the seat belts and warning the driver.


Prevention PreCollision PostCollision

53. Hybrid vehicles have rollover protection as well as high ___________ interrupt features.


Voltage Amperage Resistance

54. Operation of the ________ pump is also tied to air bag events, to shut off in the event of a collision. This is done through the air bag module and the CAN system instead of an inertia switch.


Water Fuel Hydrogen

55. Inflatable ______ _______ spread the crash forces over more of a person’s body than a standard belt.


Head Rests Seat Belts Door Panels













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ATASA 5 Restraint Systems...Inertia, Pyromania Inertia, Def Leppard 6. Pretensioners can be _____ lock or _____ type with a small explosive charge. ATASA 5 th Restraint Systems ATASA

ATASA 5 Restraint Systems...Inertia, Pyromania Inertia, Def Leppard 6. Pretensioners can be _ lock or _ type with a small explosive charge. ATASA 5 th Restraint Systems ATASA