The only sensors that come on the camry are Blind Spot Monitor and Rear Cross-Traffic Alert
Press the "BSM" button on the dashboard, to the left of the steering wheel. You'll see the Blind Spot Monitor [1] indicator light up in the outside mirrors and hear a tone as part of an initial system check. When a vehicle in the next lane enters your blind spot on either side, the indicator will light up in that side view mirror. If you signal a lane change in that direction while the vehicle is still there, the indicator will flash to get your attention.
Rear Cross-Traffic Alert [2] can help you when backing out from a parking space. When your vehicle is in reverse and your speed is less than 5 MPH, the system is designed to detect vehicles approaching between 5 and 18 MPH from the right or left rear of the vehicle. If the system senses cross traffic, it warns you by flashing the side mirror indicators and sounding a warning tone.
There are no backup sensors for stationary objects on Toyota vehicles that I am aware of. I know Ford and Honda have that as an option on their vehicles.