ATASA 5 th Study Guide Chapter 24 Pages 704 724 73 Points Be Certain to Read the Summary
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 Post tensioner Pre tensioner
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.
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 rear facing 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. 5 6 msec 10 20 msec 50 90 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 silicone filled 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 back up 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 back up 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 self check 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 side impact 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 self test has been run, only then the codes will be selfcleared by the module. 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. Cannot!
42. For diagnostic purposes, and air bag can be installed in place of the air bag to test and prove out 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., 34 110 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 self powered 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 Pre Collision Post Collision
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