These models contain a Supplemental Restraint System (SRS) also referred to as air bags that help to protect the driver and the passenger from serious injury in case of a head on collision; some models also come with front seat side impact air bags and front seat mounted roof rail air bags. The airbag modules are made of a housing that contains the cushion and the inflater unit with the inflater assembly fastened on the back of the housing and the function of inflating the bag is to occur at a very fast rate as soon as the electrical signal is triggered. This signal is transmitted through a spiral cable, which is a flat ribbed electrically conductive tape, in conformity with the position of the steering wheel. The diagnosis/sensor unit with a microprocessor is placed under the center console, with equipment, including 'crash' sensor; the 'AIRBAG' light blinks during the start to confirm proper working of the system. If a fault is detected the light will stay on which will be an indication that service is needed. Concerning airbag deployment, there should be an interaction between the impact sensors that latter closes a circuit to the inflater. A self-diagnosis circuit utilizes a light on the instrument panel, and anything that blinks with the car's ignition on needs to be repaired. Special concerns need to be adapted when performing operations around components related to the SRS system Some of these measures are disconnecting the main power of the car, thus cutting all electrical power supply to the airbag system and discharging static electricity to prevent the unauthorized deployment of airbags. After servicing, the airbag system can be reactivated by reconnecting the concerned connections, this in addition to examining the airbag warning indicator. The driver's side airbag and the spiral cable is reachable through the detachment of the steering wheel and the passenger can retain his/her airbag module due to detachment of the instrument panel. Also, tactile signals are pyrotechnical units in front seat belts for preparing the passenger for an accident; therefore, the airbag system must be turned off during any work near the seats.