On the earlier Hyundai and Kia airbag systems, B1111 means battery voltage high. The SRSCM checked its supply at key-on and found it above the limit. Later modules from these brands report the same condition as B1101, so the number depends on which generation of module the car has.
Hyundai service data from the late 1990s and early 2000s pairs B1111 with B1112. B1111 sets when input voltage exceeds the high threshold, listed in that era's manuals as 16.0 to 19.2 volts, and B1112 sets when it falls under the low threshold of 7.2 to 9.0 volts. The module samples voltage when the ignition switch is turned on or when the start signal is released.
While either code is stored the air bag lamp is on and the restraint system is out of service, so the pretensioners and airbags will not deploy in a collision. Storing the code does not damage the module, but the electrical condition behind it needs attention.
One quirk of these older systems is worth knowing before you start diagnosing. If the SRS fuse fails, a scan tool cannot communicate with the SRSCM at all while the warning lamp stays lit. A module that will not answer a scan tool with the light on usually means checking that fuse first.
Circuit. B1111 is a supply voltage code, so the parts of the restraint system that actually protect people are untouched by it. The factory procedure has a technician disconnect the battery, wait, unplug the SRSCM connector and the inflators, then measure supply at the harness with an SRS checker, looking for a reading in the 6.0 to 16.5 volt range and a solid ground.
Generally no reset is required. Correct the charging fault and clear the code with a scan tool capable of reaching the SRS on these older Hyundai and Kia systems. Where a module reset does apply is when the SRSCM is also holding locked crash data from a past deployment, since that will not clear with any scan tool, and that is what our airbag module reset is for. Send the module in and we will test it either way, or search airbag control modules if yours is beyond saving.
B1111 in this reading belongs to the older Hyundai and Kia SRSCM, documented in service manuals for cars like the Coupe and Tiburon as far back as 1998, along with the Elantra, Accent, and Sonata of that era and their Kia counterparts. Later Hyundai, Kia, and Genesis modules moved the same condition to B1101.
Check charging output at the battery with the engine running before pulling anything apart. A reading above roughly 15 volts on a 12 volt system points at the regulator or the alternator. Confirm the SRS fuse is intact, especially if a scan tool cannot see the module. Then inspect the SRSCM connector for green or crusty pins, which are common on cars this age and easy to miss with the connector still latched. Related codes: B1101, B1102, and B1318.
Related codes: B1101, B1102, B1318
Keep reading:
Code scope: Hyundai, Kia. 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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