See also:

Reporting safety defects in the U.S.
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTS ...

Function
Function overview 1 - Visual warning signal, collision risk 2 - Radar sensor 3 - Camera ...

Replacing the batteries
CAUTION When handling batteries, avoid touching their contact surfaces as this could result in poor battery function in the remote key. 3 Note the position of the battery's (+) or (–) sides. ...