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Make sure the rear bumper is clean. Mine screamed at me this morning due to snow & ice buildup. Also, if you don't get the beep when you put the car in reverse make sure it's turned on in the infotainment system.
 

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thanks for the reply. I did read other posts about issues with the sensors being dirty or covered with snow/ice. So I just tried wioing the sensors although they didn't look dirty.
It seem the icon in the dash comes on randomly, but no initial beep and nothing when backing up to obstacles.
The no initial beep indicates the circuit through the sensors isn't complete. Put the car on a lift and take a close look at the inside of the rear bumper. You're looking for a broken wire that runs from sensor to sensor. The problem is most likely damage to either a sensor, a sensor mount, or the wiring as all these are exposed to the elements on the inside of the bumper cover.
 

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Mine works and I've never seen a dash indicator, so I'm guessing that the indicator is only if there's a problem.

By "lower" do you mean quieter or lower pitch?
 

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The beep into reverse on my 2012 isn't very loud. The volume on the sensors is louder. Put your car into reverse while sitting close to something and see if they work.
 
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