The problem has been solved. It turned out that the brake light bulb P21/5W was burned out, and that's how the Crossfire was signaling the fault. I didn't know this car was so intelligent...
Another example from a few days ago - the low windshield washer fluid warning light came on in the dashboard. I was pleasantly surprised that something like that was even signaled.
I've never encountered such "intelligence" in cars before.