So I drove my 05 LS for the 1st time when the roads were bad. Had an ice storm on Friday in Chicago. I was very paranoid, as I've had a truck for 7 years, 1st exp. in a car again. The LS handled the slick roads very well. Noticed the advace trac came on quite a bit, but no issues with stopping or skidding. Question: The side mirrors are supposed to be heated I thought when you turn on the rear defroster. I noticed very little change in the ice on the mirrors. Never had this feature, does it usually take a long time to melt ice? Or is there a way to check and see if this feature is working? Gotta champagne taste on a beer budget, so I still have stock tires w/ 22k miles on them, but no real problems. Any advise is welcomed. HAGD.