See also:

Fault tracing and actions
If the message Radar blocked See manual is displayed, this means that the radar signals from the sensor have been obstructed and that a vehicle ahead cannot be detected. This, in turn, means that ...

Checking settings
The current Collision Warning settings can be checked by pressing MY CAR on the center console control panel and going to Settings Car settings Driver support systems Collision Warning. ...

Reverse ®)
The vehicle must be stationary when position R is selected. ...