Mazda 6. Manual — part 78
T–88
AIR BAG SYSTEM
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SYSTEM WIRING DIAGRAM
A6E813001046T03
.
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A6E8130T002
1
SAS unit
2
Occupancy sensor
3
Poor connection detector bar
4
Crash zone sensor
5
Twist pair
6
Data link connector
7
Instrument cluster
8
Air bag system warning light
9
Passenger-side air bag cut-off indicator light
10
Driver-side side air bag sensor
11
Passenger-side side air bag sensor
12
Clock spring
13
Inflator No.1
14
Inflator No.2
15
Driver-side air bag module
16
Passenger-side air bag module
17
Driver-side pre-tensioner seat belt
18
Driver-side curtain air bag module
19
Driver-side side air bag module
20
Passenger-side pre-tensioner seat belt
21
Passenger-side curtain air bag module
22
Passenger-side side air bag module
AIR BAG SYSTEM
T–89
T
T
SAS UNIT
A6E813057030T01
Outline
•
A 2-step air bag deployment control system has been adopted. In case of a frontal or frontal offset collision, an
optimal air bag deployment force is matched to the impact force. The inflators for the driver and passenger-side
air bag modules have two tiers, and deploy at either a low or high rate, according to the force of the impact.
•
Based on the module configuration, operation (deployment) matching the actual type of air bag module or pre-
tensioner seat belt setting variation can be controlled. If the module configuration is incomplete or incorrect, the
on-board diagnosis function displays a DTC. (See
T–97 ON-BOARD DIAGNOSTIC FUNCTION
.) If the SAS
unit is replaced, it is necessary to perform the module configuration to match the specifications of the vehicle in
which it is being installed. Refer to the Workshop Manual for the procedure.
Air Bag Module and Pre-tensioner Seat Belt Deployment Operation
Front air bag system (2-step deployment controlj
1. During a frontal or frontal offset collision, the crash sensors in the crash zone sensor and the SAS unit detect
the impact.
2. The degree of impact detected by the crash sensor in the crash zone sensor is converted to an electric signal
and sent to the SAS unit.
3. Simultaneously, the SAS unit crash sensor converts the degree of impact detected to an electrical signal.
4. The SAS unit processes the calculations for the two electrical signals at the output control circuit and compares
the value to a preset value.
5. The output control circuit determines the degree of impact to the vehicle by the value from the crash sensors,
completes an inflator No. 1 or inflator No. 2 ignition circuit, and sends the deployment signal to the air bag
modules.
: To scrap the air bag module, inflator No. 2 is deployed.
6. The SAS unit completes an ignition circuit for the pre-tensioner seat belts that is synchronized to the
deployment of the driver and passenger-side air bag modules, and an operation signal is sent to the pre-
tensioner seat belts.
.
No.
Degree of collision
force
Air bag module
deployment force
Inflator deployment pattern
1
Large
100 %
Inflator No.1 and inflator No.2 deploy simultaneously.
2
Small
60 %
Inflator No. 1 deploys, then inflator No.2*.
A6E8130T005
1
SAS unit
2
Crash zone sensor
3
Crash sensor
4
Signal amplification circuit
5
Output control circuit
6
Front air bag module (driver or passenger-side air
bag module)
7
Inflator No.1
8
Inflator No.2
9
Pre-tensioner seat belt
T–90
AIR BAG SYSTEM
Side air bag system
1. During a lateral collision to the vehicle, the crash sensors in the side air bag sensor and SAS unit detect the
collision.
2. The degree of impact detected by the crash sensor in the side air bag sensor is converted to an electrical signal
and sent to the SAS unit through the signal amplification circuit.
3. Simultaneously, the SAS unit crash sensor converts the degree of impact detected to an electrical signal.
4. The SAS unit processes the calculations for the two electrical signals at the ouput control circuit and compares
the value to a preset value.
5. The output control circuit determines the degree of impact to the vehicle by the value from the crash sensors,
completes a side air bag module and curtain air bag module ignition circuit, and sends the deployment signal to
the air bag modules.
.
Module configuration
Function
•
Module configuration is performed to provide an initial setting for the SAS unit according to the actually
equipped air bag module, pre-tensioner seat belt and occupancy sensor.
•
If there is a mismatch between the air bag system configuration and the initial setting for the SAS unit, a DTC is
displayed.
•
The module configuration is performed using only the SST (WDS or equivalent).
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A6E8130T006
1
SAS unit
2
Side air bag sensor
3
Crash sensor
4
Signal amplification circuit
5
Output control circuit
6
Side air bag module
7
Curtain air bag module
AIR BAG SYSTEM
T–91
T
T
DRIVER-SIDE AIR BAG MODULE
A6E813057010T01
Outline
•
A dual inflator, 1 inflator divided into 2, has been adopted in accordance with the front air bag system 2-step
deployment control.
Inflator Operation
1. The igniter built into the inflator begins to build up heat when the operation (deployment) signal is sent from the
SAS unit. The inflammation agent is ignited by the build up of heat of the igniter.
2. The ignition of the inflammation agent causes the combustion of an agent which releases nitrogen gas.
3. The nitrogen gas is cooled at the filter, and the filtrate is injected into the air bag.
Note
•
The gas injection outlets for inflators are divided into two tiers. Gas from inflator No.1 is injected from the
No.1 tier, and from the No. 2 tier of is inflator No. 2.
.
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A6E8130T007
1
Ignitor (inflator No.1)
2
Ignitor (inflator No.2)
3
Ignition of inflammation agent
4
Gas generating agent
5
Gas generating agent combustion
6
Nitrogen gas
7
Filter
8
To air bag
9
Ist step
10
2nd step
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