See also:

Troubleshooting
...

Inspecting your tires and wheel valve stems
Periodically inspect the tire treads for uneven or excessive wear and remove objects such as stones, nails or glass that may be wedged in the tread grooves. Check the tire and valve stems for hole ...

Operation
The radar sensor detects vehicles ahead that are moving in the same direction as your vehicle. If the radar detects that your vehicle is rapidly closing in on another vehicle, a red warning ...