The SAS control module controls the air bag system operation.
During a frontal collision, the SAS control module controls the following air bag module operation (deployment).
Driver-side air bag module
Passenger-side air bag module
Driver/passenger-side pre-tensioner seat belt
Driver/passenger-side lap pre-tensioner seat belt
Driver/passenger-side curtain air bag module
During a lateral collision, the SAS control module controls the following air bag module operation (deployment).
Side air bag module on the collision side
Curtain air bag module on the collision side
Pre-tensioner seat belt on the collision side
If an air bag is deployed due to a vehicle collision, the SAS control module sends an air bag deployment signal to each control module.
When the signal is received, each control module performs the following controls to reduce secondary injuries caused by the vehicle collision.
Rear body control module (RBCM): Collision detection unlock function (See POWER DOOR LOCK SYSTEM.)
Front body control module (FBCM): Secondary collision reduction (SCR) hazard warning light (See EXTERIOR LIGHTING SYSTEM.)
PCM: (See FUEL INJECTION CONTROL SYSTEM [SKYACTIV-G 2.5].)
The backup power supply function enables the condenser to discharge and supply power to assure air bag system operation/deployment properly for a specified time even if the power supply to the SAS control module is cut due to a collision.
Identifies the variation of the air bag module installed to the vehicle when replacing the SAS control module with a new one.
If the air bag module installed to the vehicle and the module identified by the SAS control module differ, a DTC is displayed.
Refer to the Workshop Manual for the configuration setting procedure.
The yaw rate sensor in the SAS control module detects the vehicle yaw rate (vehicle turning angle speed), and sends the detected rate to the DSC HU/CM via special CAN lines between the SAS control module and the DSC HU/CM.
The low-G sensor in the SAS control module detects the vehicle longitudinal accelerations, and sends the detected accelerations to the DSC HU/CM via special CAN lines between the SAS control module and the DSC HU/CM.
SAS control module installed under the rear console.
The following sensors are built into the SAS control module.
Crash sensor
Yaw rate sensor
Low-G sensor
If the degree of impact detected by the crash zone sensor and the crash sensor built into the SAS control module exceeds the set value during a frontal collision to the vehicle, the SAS control module sends an operation (deployment) signal to the air bag module and the pre-tensioner seat belts.
If the degree of impact detected by pressure sensor or side air bag sensor and the crash sensor built into the SAS control module exceeds the set value during a side collision to the vehicle, the SAS control module sends an operation (deployment) signal to the side air bag module and curtain air bag module.
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.
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.
6. The SAS control module completes an ignition circuit for the pre-tensioner seat belts and lap pre-tensioner seat belts that is synchronized to the deployment of the air bag modules, and an operation (deployment) signal is sent to the pre-tensioner seat belts and lap pre-tensioner seat belts.
1. During a lateral collision to the vehicle, the crash sensors in the side air bag sensor, pressure sensor and SAS control module detect the collision.
2. The degree of impact detected by the crash sensor in the side air bag sensor or pressure 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 degree 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 degree 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.
6. The SAS control module completes an ignition circuit for the pre-tensioner seat belts and that is synchronized to the deployment of the air bag modules, and an operation (deployment) signal is sent to the pre-tensioner seat belts.
The SAS control module detects the buckled or unbuckled condition of the front driver-side and passenger-side seat belts based on a signal received from the front 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 front 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).
This means that the SAS control module controls deployment so that in a collision with an impact profile which normally does not lead to high-output deployment (inflator No.1 and No.2 deploy) of the air bag modules, the corresponding air bag will deploy if either one of the front seat belts is unbuckled.
The vehicle angle speed and accelerations detected by the yaw rate and low-G sensors in the SAS control module are sent to the DSC HU/CM via special CAN lines.
The DSC system controls based on the signal sent from the SAS control module. For the DSC system operation, refer to the DSC HU/CM.
If the SAS control module performance/function cannot be maintained due to any cause, the fail-safe function stops air bag system control and flashes the air bag system warning light to prevent the air bags from operating (deploying) accidentally.