What's the BMW fault code a3b4?

The BMW fault code A3B4 translates to Message: Lighting condition incorrectly, Transmitter FRM permanent. This is indicating a fault with the MINI footwell module (FRM3). This part receives signals from multiple sensors on Your BMW and actually handles a lot of the comfort systems, like the power windows, A/C and heating fans, lights, and mirrors. So, in tandem with this error, You may notice that some of these features no longer work; You might also experience headlights and taillights that don't work, either, because of it! The solution when confronted with this code is typically to have the dealership replace it, which is going to be costly. You can try to ask them to reprogRam it instead, which sometimes will work, and only cost the labor for that, instead of a full on replacement.