These models thus have a Supplemental Restraint System (SRS) also known as an airbag for protection of the head on collision of the driver and the front seat passenger, accompanied by an airbag module with an airbag located in the steering wheel, another airbag in the instrument panel, addition of side shield and curtain shield airbags for side impact with some series of later models and a sensing /diagnostic module below the instrument panel They could also come with the seat belt pre-tensioners which are explosive components that tightens seat belts during an accident; but the assemblies of the front seat belt retractor should remain because of instances where pre-tensioners are problematic and cause the SRS warning light. The cable assembly of the steering wheel is connected to the airbag inflater module that incorporates the airbag and inflater unit contained in the steering wheel which inflates the bag almost in split second once an electrical signal is received. The second airbag is located near the passenger's side and bigger than the one attached to the steering wheel; it is situated above the glove compartment with the trim cover which divides during its inflation. The sensing and diagnostic module supplies power to the airbag system during an accident or when starting the car and, if everything is in order, the AIR BAG light turns off; its on, flashing, or an accompanying beep requires service. Side airbags and curtain shield airbags are deployed during side collisions with help of the sensors installed at moulding of center pillar. Precautions include that before approaching SRS system's components one must pull the steering wheel straight, turn the ignition key to LOCK, remove the car battery's negative terminal and wait two minutes for the supplied backup power to drain. Dealing with an airbag module, the airbag opening should be directed to outside the body, and never lying on the flat surface with opening downwards. Measurements of the resistance of components of the SRS should not be taken lest you activate the airbag with an ohmmeter, or electrical welding should not be done on vehicles with airbags until the negative terminal of the battery is disconnected. It is imperative to note that one is not allowed to actually dispose of live airbag modules, rather, they have to return the module to a dealer for harmless explosion and then disposal.
