SIR System

The supplemental inflatable restraints (SIR) system is a safety device used in conjunction with the seat belts.
The airbag does not replace the function of the seat belt. The driver and the passengers must always fasten their seat belts and adjust them for a proper fit.
The SIR is designed to protect the driver and the front seat passenger in the event of a significant frontal impact to the vehicle. The airbags deploy if the force is applied from a direction within 30 degrees of the vehicle's centerline.

The SIR system consists of a
- Driver Side Airbag Module.
- Passenger Side Airbag Module.
- Sensing and Diagnostic Module (SDM).
- Clock Spring.
- Wire Harness and Connectors.
- AIRBAG Indicator On The Instrument Cluster.

There are two separate deployment loops in the SIR system. The term "loop" is used because current leaves the SDM and returns to the SDM during deployment or testing. One loop is the circuit from the SDM to the driver airbag and back to the SDM. The other loop is the circuit from the SDM to the passenger airbag and back to the SDM.