1995 Volvo 850 Air Bag Restraint System
The Supplemental Restraint System (SRS) is designed to operate when vehicle strikes a rigid or heavy object with enough force to activate SRS. Activation impact area is directly in front of vehicle and 30 degrees on either side of dead center. SRS is not designed to activate during a side or rear collision, a rollover, or a frontal collision at low speed or with soft objects. In addition, the 850 is equipped with Side Impact Protection System (SIPS). SIPS are seat mounted air bags which deploy only in the event of a side impact intrusion in the front passenger compartment.
Main SRS components include a driver-side air bag/gas generator module mounted to steering wheel, and passenger-side air bag/gas generator module mounted to instrument panel. System also includes a contact reel (clockspring) mounted to steering column, under steering wheel, crash sensor, and standby power unit mounted under center console and SRS warning light, mounted in instrument gauge cluster light bar. See Fig. 1. All models have an On-Board Diagnostic (OBD) system located within engine compartment. All models have pyrotechnical seat belt tensioners for driver and front passenger seats. Seat belt tensioners are mounted inside “B” pillars. For SRS to operate properly, 3-point seat belts must be worn.
If vehicle’s deceleration rate, as recorded by crash sensor, is sufficiently high, crash sensor delivers voltage signal to ignite gas generators in air bag module and in seat belt tensioners. When air bag module gas generator is ignited, a quantity of non-toxic nitrogen gas is produced, filling air bag in a few hundredths of a second. Immediately after air bag inflates, gas is released through a ventilation hole on rear of air bag module. Entire sequence of air bag inflation and collapse takes about 0.2 seconds.
Seat belt tensioners are connected to seat belt reel by a cable. When seat belt tensioner is activated by crash sensor, belt is tightened about 4″. In a collision, seat belt tensioners tighten seat belts instantly, holding occupant tightly against seat back.
Get pdf 1995 Volvo 850 Air Bag Restraint System
