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Air Bag Safety Class

A.S.T. Training

I nstructor: John Forro

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Is It Working? (Death Chart)

0

5

10

15

2025

30

35

Belted Unbelted Rear

faced

Safety

seat

Uknown

Children

Audult Drivers

Adult Passangers

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Popular Beliefs T or F?

Very costly

Unsafe for technicians to service

Unsafe residue

Killing machines for short people (10 inch

rule) A lot of accidental discharges in shops

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What should we tell our

customers?

Wear safety belt at all times.

Pay attention to idiot lights

Make passengers buckle up.

Sit appropriately

Strap child in correctly

Drive safely!!!

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How does this system work?

1. Vehicle is involved in a 10 MPH or higher front end

collision.

2. At least 1 crash or safing sensor and 1

momentum/deceleration sensor activated. A safing

sensor is another safety inertia type sensor located

inside the control module. This sensor is used to

prevent unwanted deployments.

3. Signal sent to air bag module to deploy bag.

4. Module deploys air bag in less the 7 ms on drivers

side conventional systems.

5. Nitrogen gasses released through vent holes in back of

bag, bag deflates.

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What are the typical

components in this system?

Air Bags Air Bag Module

Crash/Safing Sensors Clock Spring

System Wiring and

ConnectorsSmart System Devices

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Front Crash/Safing Sensors

These devices are usuallylocated in the front grill

area or the kick pad/ firewall areas. They aredesigned to complete acircuit back to the air bagmodule when a hard

enough crash is measured.Most Safing sensors willbe located inside the airbag control module.

Crash Sensor

Magnet

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Air Bag Control Module

The air bag control moduleis almost always located

inside the passengercompartment. There are atleast 1 and sometimes 2more safing sensors locatedinside this unit that must

also close for deploymentto occur. This unit isresponsible for sending thedeploy command to the air

bag.

Safing Sensor

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Clock Springs

Located inside thesteering wheel. This

device is used toconnect the hard wiredair bag harness to thesystems harness while

allowing the steeringwheel to maintain a fullrange of motion.

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Air Bag Circuit Harness and

Connectors. The air bag harness and

connectors are yellow

in color.

DO NOT ATTEMPT

ANY TYPE OF

REPAIRS ON THISCIRCUIT!Typical Air

Bag Harness

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Why did the government mandate theuse of automatic safety devices?

Todays vehicles are built to collapse in a

collision.

Occupant safety is the #1 concern.

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What does the future hold?

Smart Systems

Seat Sensors

Determine size and weight of individual.

Optical Sensors Determines how close and size of occupant/car seat.

Determines which way the car seat is facing.

Child-Car Seat Sensors

Determines direction of car seat. Occupant Sensors

Determines if someone is present by measuring for body heat.

Air Bag Curtains

Designed to protect the entire passenger compartment.

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Universal Servicing Procedures

1. Disconnect the negative battery cable for at least

10 minutes to discharge modules capacitors.

2. Use approved testing methods. No ohmmeters

alone.Ohmmeter test voltage could deploy bag.

3. Wear eye protection.

4. Wear safety gloves.

5. Follow manufacturers procedures.

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