No, the rear sensing system won't signal if you are in any gear except reverse. The wiring for the module is connected so that it turns on when you put the car in reverse. (This assumes the sensors haven't failed. If they are dirty, they can sometimes signal when an object isn't there.) Some newer cars have blind spot monitors that indicate an object approaching from behind and to the side; these don't indicate an object directly behind the car.

I hope this helps.

Cindy Wells