My 2010 Laramie has been doing this same issue lately. Remote start and the heated steering wheel works fine, but the front seat heaters will not turn on. I can manually push the seat heater button and it will light up for a few seconds and then go off.
I don't remember if I noticed that if I don't use remote start, and if they will work after manually starting the pickup. I will have to check that out tomorrow morning. I do know that after I've driven the pickup later on like when I go to lunch, the seat heater will come on and stay on until I turn it off. It just ****** me off to have ice cold leather seats to sit on during my 20 minute commute to work. Where do I find the settings for the seat heaters at in the EVIC or in the radio?
Also, as another note, I've noticed that even though my easy access seat memory is enabled in the EVIC, it hasn't been working either. I have alfaobd so should I look at some settings in there?