Question 1

What are the key components and precautions associated with the Supplemental Restraint System (SRS) and Air Bag on 2003 through 2009 Toyota 4Runner?

Accepted Answer

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.

Question 2

What is the purpose and function of the Supplemental Restraint System (SRS) and Air Bag on 1995 through 2004 Toyota Tacoma?

Accepted Answer

If you own a certain model of Tacoma, it is possible to add a combo device with both an airbag (SRS) and a seat belt for driver and passenger safety in front crashes. The system features packages - the first in the steering wheel, a second in the panel above passengers, and a third sensor at the center to monitor activities. The airbag inflator unit inside the steering wheel inflates the bag when the system gets an electrical signal. A special coil wire sends steering-wheel-independent signals below the steering wheel module, triggering the sodium azide/copper oxide reaction, which makes nitrogen gas to inflate the bags. The passenger side airbag covers the glove compartment space and holds four different parts: inflator, bag, housing, and trim. The control unit for the airbag system powers and checks the system when starting the car, and shows the "AIR BAG" warning light when everything works correctly. If an issue affects the airbag, we'll get both a warning light and an audible alarm telling to fix it right away. Before touching steering wheel or SRS components, you must disarm the system by setting the wheels straight, turning the ignition to LOCK, removing the negative car battery, and waiting at least two minutes until the backup power shrinks. Keep the airbag module opening facing away from the body, and avoid putting it on anything with the opening downwards. We can't test the electrical resistance of SRS parts, and we need to cut airbag power connections before using electrical welders. When people have crashed with us, they need to drive their car back to a dealer to make sure the airbags work correctly and get thrown out properly.

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