B1477 is the Kia and Hyundai code for a passenger side curtain airbag circuit reading above the resistance window the control module allows. High resistance is the open circuit direction, so the fault is a connection, a broken wire, or a curtain that has already fired. The module is rarely the part at fault.
The curtain airbag circuit on a Kia or Hyundai, written as CAB in the factory books, runs from the restraint control module out to a curtain on each side of the headliner. Each curtain has an initiator, called a squib, at the end of a pair of wires that travel up the pillar and along the roof rail. The SRSCM pushes a small test current through each squib circuit and measures what comes back, at key on and continuously after that.
Kia records the code when resistance in the CAB squib circuit lands outside the allowed range, and B1477 is the high side of that measurement on the passenger curtain. Climbing resistance means the path is getting worse, and the far end of that trend is an open circuit. The numbering around it follows the same pattern: B1473 is the driver curtain reading high, B1474 is the driver curtain reading low, and B1479 is the passenger curtain shorted to ground.
Until the circuit reads right, the SRS warning lamp stays on and the module cannot count on that curtain firing in a side collision.
Circuit. The module takes this reading live and stores nothing about the vehicle's history, so once the path reads correctly the code stops setting. There is one overlap that matters. A vehicle whose curtain deployed reads that circuit open, so B1477 often shows up beside a stored crash record after a side impact. The deployment data locked in the SRSCM is a separate problem from the curtain circuit, and both need handling.
No. Restoring the module's memory does nothing for a loose connector or a broken wire, and the code returns on the next key cycle. Repair the circuit and the light should go out on its own. If the vehicle was in a collision and the module also locked with crash data, do the physical repairs first, then send the module in for an airbag module reset. When the curtain itself is the part you need, we stock genuine OEM side curtain airbags by year and model.
B1477 with the curtain airbag wording belongs to the Kia and Hyundai SRSCM, which the two brands share, and Genesis models on the same restraint architecture read it the same way. Kia and Hyundai service data use identical text for the code. Other manufacturers assign B1477 to circuits that have nothing to do with a curtain airbag, so confirm the code came from a Kia or Hyundai restraint module before you order anything.
Disconnect the battery and wait before touching anything in the circuit. Kia's manual warns against putting test equipment on SRS circuits unless the procedure calls for it, and probing a live squib connector is how airbags go off in a shop. Once the system is down, pull the lower pillar trim on the passenger side and look at the curtain connector. Check that the latch clicked home, the terminals are clean, and nobody pinched the harness putting the trim back.
Work the harness next, up the pillar and along the roof rail, since a break there usually follows a headliner drop or a roof repair. If the wiring checks out and the vehicle has not been in a side collision, the curtain is the part. B1473 and B1474 are the driver side versions of this reading, and B1479 is the shorted version on the same passenger circuit.
Related codes: B1473, B1474, B1479, B1346
Keep reading:
Code scope: Kia, Hyundai, Genesis. 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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