Passenger Detection; Seat Track Position Sensor Function; Passenger Sensing System Outline - Mazda CX-9 2007 Service Highlights

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.
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SEAT TRACK POSITION SENSOR FUNCTION

• The seat track position sensor converts the seat position into an electrical signal and sends it to the SAS
control module.
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SEAT TRACK POSITION SENSOR CONSTRUCTION/OPERATION
• 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.
FRONT
METAL PLATE
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PASSENGER SENSING SYSTEM 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.
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08-10–10
AIR BAG SYSTEM
SEAT TRACK
POSITION SENSOR
SEAT
POSITION
SAS
SIGNAL
CONTROL
MODULE
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