Mazda CX-5 Service & Repair Manual: Passenger Sensing System [Two Step Deployment Control System]

Mazda CX-5 Service & Repair Manual / Engine / Control / Passenger Sensing System [Two Step Deployment Control System]

Purpose

The passenger sensing system detects whether or not there is an occupant on the passenger seat to control the operation (deployment) of the passenger-side air bag system corresponding to the detected condition.

Function

Measures the total seated weight on the passenger-side seat, determines whether there is an adult or child present (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, pre-tensioner seat belt and lap pre-tensioner seat belt.

Construction

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 (information display), and SAS control module installed in the console.

Operation

1. The load on the passenger-side front seat is converted into an electric signal by the strain gauge built into the seat weight sensor, and this signal is sent to the seat weight sensor control module.

2. The electronic signals from the four seat weight sensor are used for calculation by the seat weight sensor control module, which divides the result and then determines whether there is an adult or child (including a child-restraint seat) in the passenger-side seat, or that it is empty. The determined result is sent to the SAS control module.

3. The SAS control module performs control based on this determined result as shown in the following table when the module detects a level of impact requiring operation (deployment).

?: Possible-: Not possible


Determined result	Determined weight	Passenger-side air bag module operation (deployment)	Passenger-side side air bag module operation (deployment)	Passenger-side pre-tensioner seat belt operation (deployment)	Passenger-side lap pre-tensioner seat belt operation (deployment)	PAD indicator
Adult	Approx. 42 kg {93 lb} or more*1	?	?	?	?	Not illuminated
Child (including child-restraint seat)	Approx. 30 kg {66 lb} or less*1	-	-	-	-	Illuminated
Empty	Approx. 0 kg {0 lb}	-	-	-	-	Illuminated

NOTE:

The passenger-side air bag module, the passenger-side side air bag module and the passenger-side pre-tensioner seat belt system will be turned off as the total seated weight drops toward 30 kg {66 lb}
and they will be turned on again before the weight exceeds 42 kg {93 lb}
.

*1 Figure is the determination result when a weight is placed on the seat surface. It does not indicate the weight of a passenger. The amount of weight that the system determines differs depending on how the passenger is seated on the seat.

CAUTION:

If any of the following work is performed, perform the seat weight sensor calibration using the Mazda Modular Diagnostic System (M-MDS).

Replacement with a new seat weight sensor
Replacement with a new seat weight sensor control module
Replacement with new passenger-side seat parts
Disassembly of the passenger-side seat

If any of the following work is performed, perform the seat weight sensor inspection using the Mazda Modular Diagnostic System (M-MDS).

Removal of the passenger-side seat
Loosening and retightening of passenger-seat fixing bolts
Or, the vehicle is involved in a collision

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