9-5 Aero (9600) L4-2.3L Turbo (2.3HOT) (2004)
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Passenger sitting in seat YES/NO (sends information to the ACM, seatbelt reminder)
Airbag control module transmits messages on:
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Rheostat value
In the event of a fault in the Passenger Presence System the passenger airbag/side airbag is switched off.
Calculation algorithms
There are four statistical algorithm functions.
1. Basic functions
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A fixed upper or lower limit in order to establish the nominal threshold value.
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Adjustment of nominal threshold level when an adult is belted in the passenger seat during driving.
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Adjustment of nominal threshold level when a child is belted in the passenger seat during driving.
2. Adjusting algorithm based on passenger seat ageing. This takes place when the seat is empty.
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Adjustment of seat weight.
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Nominal threshold value is adjusted either up or down.
3. Adjusting algorithm based on passenger seat environment.
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Temperature compensation using sensor built into PPS.
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Calibration of pressure.
4. Adjusting algorithm based on belt force sensor (643)
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Compensation of tensioning force.
Explanation
Adult limit value is equivalent to a woman who weighs 46.7 kg or more. Child limit value is equivalent to a 6 year old who weighs less than or equal to
25.6 kg. The threshold value for the seat is a reference value of a load. Each car model has its own reference value. This value is programmed by Saab.
Nominal threshold value for the seat is a value based on the seat threshold value which then adapts to the weight in the seat.