System Operation

SRS Components:

The SRS and seat belt tightening Systems consist of four air bag modules, SRS air bag control unit (SRS-ECU), SRS warning light, clock spring, and seat belt pre-tensioner. Air bags are located in the center of the steering wheel, above the glove box, and in the front seatback assemblies. Each air bag has a safing folded air bag and an inflators the system and has a safing G sensor and an analogue G sensor. On all air bag modules, the inflator does not contain sodium azide. The side impact sensors inside the center pillar inner monitor the shock incurred by the sides of the vehicle. The warning light on the instrument panel indicates the operational status of the SRS. The clock spring is installed in the steering column.

The SRS-ECU detects the impact produced at the time of a collision from the safing and analogue G sensors and supplies squib ignition current to the air bag modules.

The SRS-ECU has the following functions:

This triggers the air bag modules.
- Back up function (charging condenser for power supply) in case of a power failure when the SRS air bag is deployed (in a collision).
- Voltage raising function (DC-DC converter circuit) in case of a drop in the battery voltage.
- Diagnostic test mode to improve safety and reliability.