B1994 means the module read an open, or resistance higher than the expected squib range, on the driver side-mount airbag circuit. That bag lives in the outboard bolster of the driver seat, and the circuit runs to a connector underneath.
Side-mount airbags sit in the side of the seat back so they stay in the right position no matter where the seat is adjusted. The tradeoff is that the wiring has to survive everything the seat does. Every fore and aft adjustment, every recline and every time somebody shoves a bag under the seat works that harness and its connector.
The restraints control module measures the side airbag ignitor the same way it measures the frontal bags, expecting a low resistance in a defined window, commonly somewhere between about one and a half and four and a half ohms depending on the application. A reading above that window sets B1994 and puts the airbag light on.
Ford addressed this pattern directly on some 1999 to 2001 Explorer, Mountaineer and Explorer Sport models, where an intermittent airbag lamp with B1994 or B1998 stored traced back to high resistance in the side airbag harness circuits.
Circuit fault. The module is reporting resistance on a squib circuit it checks live. On a vehicle with side impact history the deployed bag is what reads open, and any stored crash record is separate from this code and has to be dealt with separately.
No. Repair or replace the part first, then the light goes out on its own. Genuine OEM seat-mounted side airbags are listed under side airbags in our parts store. If the vehicle was in a collision and the module also locked with crash data, that is when our airbag module reset comes in, after the restraint parts are back in the car.
Ford, Lincoln and Mercury vehicles equipped with seat-mounted side airbags use B1994 for the driver side, with B1998 covering the passenger side. The same number appears in other manufacturers' code lists, so check the make before treating a generic definition as final.
Reach under the driver seat and find the airbag connector, usually a yellow one, before you take anything apart. Unlatch it, look at the pins, seat it firmly and see whether the code returns. Run the seat through its full travel with the code monitored, since a fault that appears only at one extreme is a harness that is being stretched. If the connector and harness are clean, the inflator in the seat is next.
Related codes: B0020 (left side airbag deployment control), B0022 (side airbag deployment control), and B1932 (driver airbag circuit open).
Related codes: B0020, B0022, B1932
Keep reading:
Code scope: Ford, Lincoln, Mercury. The same number can mean something different on another manufacturer, so match the code to your make before you act on it.
A reset clears stored crash data. A replacement part fixes a hardware fault. We have read these codes since the nineties and will tell you which one you are looking at.
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Ford parts and codes · Do not see it listed? Request a part or call 501-988-0611.