Do your mirrors fold in when the car has been locked???I did find a site with the brochures for each model year and my car has every package offered on it I checked my car fax and it says I have a 2012, manufacture date was July 2011. I checked both brochures. Under standard equipment it says heated mirrors standard and in the manual it shows you how they are supposed to retract.
Here is a link to the brochures for 7 years starting with 04 (missing 05, and 10)
https://personalizeyourvolvo.com/PDF_Brochures/C70/