odd noise from rear deck

[soninlawscar]

2012 m37s, when you shift from park to reverse a noise like a air pump or bad speaker comes from rear deck.

[soninlawscar]

when the car is put in reverse, a noise from rear deck like a air pump, then stops after a min.

[emm3seven]

Do you have the rear sunshade? Is it mechanical noise from the shade mechanism (which would be triggered when car is put in reverse)? That rear shade is a very very common failure.

[Ilya]

Please only post once.

I'm locking this thread as you posted two other threads for what sounds like the same issue (I deleted one and left this one - rear-sun-screen-t627683.html).