remote starter?

I have a car.....it is not a Toyota......but after a few years of ownership I decided to have a remote starter installed. It gets very cold here in the upper midwest. The remote starter works great. A friend of mine, who owns a Toyota.....Tundra I believe, every once in awhile sees me remote start my car and he says his truck can`t have a remote starter installed in his truck. He says this because his truck has door locks that open when the truck starts. I keep telling him that the companies that make remote starters have ways to disable the lock thing. He insists that this is not so. Who is full of bull? I believe he is. BTW my car doesn`t have power door locks. TIA for any info. Dan.