The driver airbag is the bag, the inflator, and the padded cover built into one unit that bolts into the steering wheel hub. Here is how it works, how to read the label on the back of it, and what separates a good recycled OEM replacement from one that will not fit.
The driver airbag is one sealed assembly: a folded nylon bag, a gas generator called an inflator, and the padded cover that hides both. It bolts into the hub of the steering wheel. Toyota's catalog calls the part a steering wheel pad assembly. Ford and GM call it a driver air bag module. The horn switch is usually built into the same unit, which is why pressing the center of the wheel blows the horn.
Nothing about the part is smart. The SRS control module reads the crash sensors, decides an impact is severe enough, and sends current down a pair of wires to a small igniter inside the inflator called a squib. The squib lights a solid propellant charge. The charge makes gas, the gas fills the bag in a few thousandths of a second, and the bag pushes out through the cover along a molded tear line you can usually see as a faint seam on the back of the plastic.
Most driver airbags built since the early 2000s are dual stage. Two propellant charges and two igniters share one housing. In a lower-speed impact the module fires the first stage only. In a harder hit it fires both, sometimes a few milliseconds apart. That is why many of these units have two connector plugs on the back instead of one, and it is the first thing to compare against the unit that came out of your car.
The unit mounts to the steering wheel armature with two Torx screws driven in from behind the wheel, or with spring clips released through small access holes in the back of the spokes. Directly behind it sits the clock spring, also called the spiral cable. That is a flat ribbon conductor coiled inside a plastic housing so the airbag, the horn, and the buttons in the spokes stay connected while the wheel turns. If your airbag light came on and the horn quit in the same week, read our clock spring versus airbag module comparison before you buy a bag.
The OEM part number sits on the back of the metal canister, on a printed label or stamped into the housing, facing the column once installed. Expect the manufacturer's number, a supplier number from Autoliv, ZF, or Joyson, a build date, and a lot or serial code. Toyota and Lexus driver airbags carry numbers that start with 45130, then a model code, then a two-character suffix that encodes the cover color and finish. Most brands hide the trim variation in the tail end of the number the same way.
The connectors are yellow. Manufacturers reserve yellow for SRS circuits, and the terminals are usually gold-plated to keep resistance low and steady. Each plug carries a small secondary lock called a CPA clip, and inside the plug a shorting bar bridges the two squib pins the moment the connector is unplugged, so a loose bag sitting on a table cannot fire from stray voltage. Those clips get brittle with age and snap. A broken one is a common cause of a driver-side circuit code.
Front airbags go by driver and passenger, which is what the catalogs use. LH and RH describe the side of the vehicle as you sit facing forward, so on a US left-hand-drive car LH is the driver side, and those letters belong mostly to side and curtain bags.
A deployed airbag is finished. The propellant burned, the canister is scorched, the cover is split, and the fabric is hanging out of the wheel. The cabin usually smells like burnt propellant and there is fine white powder on the glass from the talc that keeps the bag folded.
An undeployed bag with the light on is a different problem entirely. The dash light follows what the control module remembers, not the condition of the bag, so a car that has fired its restraints carries locked crash data. Install a flawless airbag and the light stays on until that record is cleared, which is what our airbag module reset does in our shop.
Codes point you at the right part. A driver squib circuit code such as B1049, driver airbag circuit open, generally means high resistance somewhere between the module and the bag, and the clock spring or a corroded connector causes that far more often than the airbag itself does. Look your code up on our airbag code lookup before you buy anything.
What to check before you commit:
Every airbag we sell is recycled genuine OEM, recovered from donor vehicles and inspected in Jacksonville. NHTSA has documented counterfeit driver airbags that carry convincing automaker branding and then fail on deployment or throw metal into the cabin. A unit with a traceable donor and a readable factory label sidesteps that whole category. See current inventory in the driver airbag listings.
An airbag module is a pyrotechnic device, so it ships as UN3268, a Class 9 hazardous material, in UN-spec packaging marked ground only. No air freight, for any reason. Cross-country ground takes the days it takes. We ship to the lower 48 states.
Installation belongs with a qualified installer. Battery disconnected, a wait before anyone touches a yellow connector, the bag never set face down on a table, factory torque on the mounting fasteners, and no reuse of one-time fasteners where the manufacturer specifies them. Restraint parts are final sale unless the part is not as pictured, and we spell that out on our returns page. Call 501-988-0611 with your year, make, model, and VIN and we will check inventory.
No. The inflator holds a solid propellant charge that burns once. After deployment the propellant is spent, the housing is scorched, and the cover has torn along its seam. Folding the bag back in does not restore anything. The unit gets replaced.
Usually not on its own. The light tracks the crash record stored in the SRS control module, and that record stays locked in memory after a deployment no matter what hardware you bolt in. The module has to be reset before the light clears.
Look at the back of the unit. A dual-stage airbag has two squib connectors, one per inflator charge, and a single-stage has one. The part number confirms it. Never substitute one for the other or fake the second circuit with a resistor.
On most vehicles yes, the horn switch is built into the airbag cover, which is why the center of the wheel honks. The signal still travels through the clock spring behind the airbag, so a dead horn plus an airbag light points at the clock spring more often than at the bag.
Year, make, model, trim, and VIN, plus a photo of the label on the back of your old unit if you can get to it. The VIN resolves the mid-year and trim splits that year and model alone cannot.
Other parts in the catalogue:
Passenger airbag: the module behind your dashboard Knee airbags: what they do and how to buy the right one Side curtain airbags Seat side airbags Seat belt retractors Seat belt pretensioners All part types
Our staff has handled these parts since the nineties.
Genuine OEM, tested, and shipped ground from Jacksonville, Arkansas.
Do not see it listed? Request a part or call 501-988-0611.