If he changed a setting in the BCM he would have had to use the tool. There may be a slim chance it could be something that the dealer could change but from what I have seen when I took my truck in there were not a lot of options. They are very limited on what they can turn on in our trucks because it has to go by the available options list. The tool eliminates that and we can pretty much turn on anything that that BCM has. The mirror codes are the only ones that don't seem to want to activate when we use the tool. It is fortunate that Deer Guy had already bought the tool so he was able to go in and actually see the fault codes and kind of help him figure out what direction to go and then obviously figure it out on the BCM. I'm interested to see what he found out. All is not lost though unless I'm understanding this incorrectly which I don't want to speak too soon as long as you find the seats out of a truck that did not have the rear heat option you'll be fine. Remember my seats work perfectly because they came out of a truck without rear heat.