The control unit responsible for detecting your key fob or smartphone-based digital key has lost its memory or was never properly configured. It is receiving a signal but does not know how to validate it.
The symptoms of B1FBD54 are not catastrophic—the car will still drive—but they are persistently annoying. Depending on the specific component, the driver may experience: mercedesbenz errorb1fbd54 work
Pushing the physical 360° camera button or shifting into Reverse fails to prompt a live external view. The control unit responsible for detecting your key