SAS CONTROL MODULE CONSTRUCTION/OPERATION

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Front Air Bag System

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 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.

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Side Air Bag System

1. During a lateral collision to the vehicle, the crash sensors in the side air bag sensor No.1, side air bag sensor No.2 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 three 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 and curtain air bag module ignition circuit, and sends the deployment signal to the air bag modules.

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Rollover Control

1. When the vehicle starts to rollover, the roll rate sensor in the SAS control module detects the vehicle rolling angle speed, and the low-G (YZ) sensor in the SAS control module detects lateral and vertical accelerations.

2. When the angular speed detected by the roll rate sensor exceeds the specification, an initial rollover condition is determined and the operational circuit calculates the rolling angle based on the angular speed detected by the roll rate sensor.

3. When the rollover control operation conditions of angular speed and rolling angle are met and the vehicle is determined to be in a rollover condition based on the acceleration detected by the low-G (YZ) sensor, an electronic signal is output to the output signal circuit.

4. The output signal circuit completes an ignition circuit, and an operation (deployment) signal is sent to the air bag module and pre-tensioner seat belts indicated in the table below.

×:Possible
-:Not possible

Position | Front air bag module operation (deployment) | Side air bag module operation (deployment) | Curtain air bag module operation (deployment) | Pre-tensioner seat belt operation (deployment)
--- | --- | --- | --- | ---
Driver side | - | - | × | ×
Passenger side | - | - | × | ×

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DSC/RSC system control

• The vehicle angle speed and accelerations detected by the roll rate, yaw rate, and low-G (XY) sensors in the SAS control module are sent to the DSC/RSC HU/CM via special CAN lines.
• The DSC/RSC system controls based on the signal sent from the SAS control module. For the DSC/RSC system operation, refer to the DSC/RSC CONSTRUCTION.

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