These models come with at least two airbags called Supplemental Restraint System (SRS) that help protect the head and chest of the driver and the front seat passenger in case of a frontal crash. Located on the transmission tunnel below the instrument panel, the airbag control module is, while some models include side curtain supplementary airbags that are evident from their '11SRS-AIRBAG' emblem on the headliner. The airbag module embraces the airbag complemented by the inflater, that is initiated by the electrical signal coming from the control module, and in turn it is transmitted through the clock spring that provides the steering wheel mobility. The passenger airbag located in the upper area of the glove box and can be turned off when transporting young children but shouldn't generally be disabled. Side-curtain airbags that optionally run from the A-pillar to the C-pillar should also not be removed if they were deployed. Some models feature the pyrotechnic units that are located in the seat belt Many retractor systems come equipped with pyrotechnic units which activate during an impact and tighten the belts. Before performing any activity near any SRS component, it is wise to switch off the air bag system to avoid a possible deployment. To disable the system the key should be removed, and engine switched off, battery negative terminal should be disconnected and system should be left inactive for at least 2 minutes. Plug back the negative terminal of the battery then turn on the ignition and ensure the check light for air bag is working.