Mazda X-5. Manual — part 94

AIR BAG SYSTEM

08–10–5

08–10

SAS CONTROL MODULE FUNCTION

E5U081057030N01

Outline

• A two-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.

• A drip-proof sheet has been installed to the connector for improved waterfroofing.

End Of Sie

SAS CONTROL MODULE CONSTRUCTION/OPERATION

E5U081057030N02

Front Air Bag System (Two-Step Deployment Control)

1. During a frontal or frontal offset collision, the crash sensors in the crash zone sensor and the SAS control

module detect the impact.

2. The level of impact detected by the crash sensors in the crash zone sensor is converted to an electric signal

and sent to the SAS control module.

3. Simultaneously, the SAS control module crash sensor converts the level of impact detected to an electrical

signal.

4. The SAS control module 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 level 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.

6. The SAS control module 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 (deployment) signal is sent to
the pre-tensioner seat belts.

No.

Level of collision force

Air bag module

deployment force

Inflator deployment pattern

1

Large

Large

Inflator No.1 and inflator No.2 deploy.

2

Small

Small

Inflator No.1 deploys.

SAS CONTROL MODULE

CRASH ZONE SENSOR

CRASH
SENSOR

CRASH
SENSOR

SIGNAL
AMPLIFICATION
CIRCUIT

OUTPUT
COTROL
CIRCUIT

FRONT AIR BAG MODULE
(DRIVER OR PASSENGER-
SIDE AIR BAG MODULE)

INFLATOR NO.1

INFLATOR NO.2

DRIVER OR PASSENGER-SIDE
PRE-TENSIONER SEAT BELT

C3U0810S601

AIR BAG SYSTEM

08–10–6

Side air bag system

1. During a lateral collision to the vehicle, the crash sensors in the side air bag sensor and SAS control module

detect the collision.

2. The level of impact detected by the crash sensor in the side air bag sensor is converted to an electrical signal

and sent to the SAS control module through the signal amplification circuit.

3. Simultaneously, the SAS control module crash sensor converts the level of impact detected to an electrical

signal.

4. The SAS control module 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 level of impact to the vehicle by the value from the crash sensors,

completes a side air bag module ignition circuit, and sends the deployment signal to the air bag modules.

Seat Position Matching Deployment Control

• The SAS control module controls the air bag deployment operation pattern (deployment only inflator No.1 or

both inflator No.1 and No.2) according to the seat track position of the driver’s seat.

• The SAS control module detects the seat track position based on the seat position signal received from the

seat track position sensor.

• When the driver’s seat is in a forward position, the SAS control module deploys only inflator No.1 to lessen the

air bag module deployment force.

SIDE AIR BAG SENSOR

SIDE AIR BAG
MODULE

CRASH
SENSOR

SIGNAL
AMPLIFICATION
CIRCUIT

OUTPUT
CONTROL
CIRCUIT

CRASH
SENSOR

SAS CONTROL MODULE

E5U810ZS5103

Seat Position

Air bag module deployment control

A

Normal control (only inflator No.1 deploys or both inflator No.1 and No.2 deploy)

B

Only inflator No.1 deploys

REAR

FRONT

B

A

SEAT TRACK POSITION
SENSOR

E5U810ZS5004

AIR BAG SYSTEM

08–10–7

08–10

Seat Belt Buckled/Unbuckled Condition Matching (Deployment) Control

• The SAS control module detects the buckled or unbuckled condition of the driver-side and passenger-side seat

belts based on a signal received from the buckle switch. Based on this signal, the necessary air bag system
deployment is controlled according to the impact profile (speed) range.

• When the SAS control module detects that the driver-side or passenger-side or seat-belt is unbuckled, it lowers

the minimum specified value of the impact profile (speed) for high-output deployment (inflator No.1 and No.2
deploy simultaneously). This means that the SAS control module controls deployment so that in a collision with
an impact profile which normally dose not lead to high-output deployment (inflator No.1 and No.2 deploy
simultaneously) of the air bag modules, the corresponding air bag will deploy if either one of the seat belts is
unbuckled.

Passenger Detection System Operation (Deployment) Control

• The SAS control module, which receives the signal from the seat weight sensor control module, controls the

passenger-side air bag module operation (deployment) and the illumination on/off for the PAD indicator based
on the passenger determination result for the passenger-side seat.

• If the seat weight sensor control module determines that the passenger-side seat is occupied by a child

(including the child restraint seat), the SAS control module controls the system so that the passenger-side air
bag module, passenger-side side air bag module and the passenger-side pre-tensioner seat belt do not
operate (deploy), even if the level of impact from the collision would normally cause the air bag modules to
operate (deploy). The seat weight sensor control module also informs the driver and other passenger
(passenger-side seat) that the air bag module is in non-operation (non-deployment) status by illuminating the
PAD indicator.

• If the seat weight sensor control module determines that the passenger-side seat is not occupied, the SAS

control module sets the air bags to non-operation (non-deployment) status, the same as when a child is
determined, and turns off the PAD indicator.

• If the seat weight sensor control module determines that an adult is seated in the passenger-side seat, the SAS

control module controls the system so that the passenger-side air bag module, passenger-side side air bag
module and the passenger-side pre-tensioner seat belt operate (deploy) normally during a collision, and turns
off the PAD indicator

• When the ignition switch is turned to the ON position, the PAD indicator illuminates for approx. 6 s while the

SAS control module inspects for malfunctions in the circuit. If a malfunction is detected in the circuit, a DTC is
displayed.

Passenger Air Bag Deactivation (PAD) Switch Operation (Deployment) Control

• When the PAD switch is turned to the OFF position, the SAS control module inhibits operation (deployment) of

the passenger-side air bag module, passenger-side side air bag module, and the passenger-side pre-tensioner
seat belt even if the degree of impact from a collision is sufficient for normal air bag module operation
(deployment). At the same time, the PAD indicator illuminates to alert the driver and passengers (passenger-
side seat) of the inoperational (undeployable) condition of the air bag.

• When the PAD switch turned to the ON position, the passenger-side air bag module, passenger-side side air

bag module, and the passenger-side pre-tensioner seat belt operate (deploy) normally during a collision and
the PAD indicator goes out.

• When the ignition switch is turned to the ON position, the PAD indicator illuminates for approx. 6 s while the

SAS control module inspects for malfunctions in the circuit. If a malfunction is detected in the circuit, a DTC is
displayed.

End Of Sie

SEAT BELT BUCKLED

PRE-TENSIONER SEAT BELT

IMPACT FORCE

INFLATOR
DEPLOYMENT

INFLATOR
NO.1 AND NO.2

INFLATOR NO.1

SEAT BELT UNBUCKLED

C3U0810S015

AIR BAG SYSTEM

08–10–8

SEAT TRACK POSITION SENSOR FUNCTION

E5U081057030N03

• The seat track position sensor converts the seat position into an electrical signal and sends it to the SAS

control module.

End Of Sie

SEAT TRACK POSITION SENSOR CONSTRUCTION/OPERATION

E5U081057030N04

• The seat track position sensor consists of a Hall element (semi-conductor) and a magnet. The sensor converts

the effect of the magnetic flux (produced by the magnet) on the Hall element, into an electrical signal.

• When the driver’s seat is moved to a forward position, the metal plate installed near the front of the seat track

passes through the groove in the seat track position sensor. When this occurs the magnetic flux of the sensor
changes and that change is sent as an electrical signal to the SAS control module. The SAS control module
receives this signal and determines that the driver’s seat has been moved to a forward position.

End Of Sie

PASSENGER SENSING SYSTEM OUTLINE

E5U081057031N01

Outline

• Measures the total seated weight on the passenger-side seat, determines whether there is an adult or child

(including a child-restraint seat), or that it is empty, and then controls operation (deployment) or non-operation
(non-deployment) of the passenger-side air bag module and pre-tensioner seat belt.

End Of Sie

PASSENGER SENSING SYSTEM CONSTRUCTION

E5U081057031N02

• Consists of seat weight sensors installed above the passenger-side seat rails, a seat weight sensor control

module installed on the back side of the passenger-side seat cushion, the PAD indicator, and SAS control
module installed in the console panel.

End Of Sie

SEAT TRACK
POSITION SENSOR

SEAT
POSITION
SIGNAL

SAS
CONTROL
MODULE

FRONT

METAL PLATE

CHU0810S004

SEAT WEIGHT
SENSOR (LH)

SEAT WEIGHT
SENSOR CONTROL
MODULE

SEAT WEIGHT
SENSOR (RH)

PAD INDICATOR

SAS CONTROL
MODULE

E5U810ZS5005