I will definitely look for that module when I get back home, that might be my issue. Do you know if that is a dealer-only part or if there is any aftermarket availability? Will do some Googling and see what turns up.
Hope you can find those diagrams, luckily I know someone smart enough to read them if I can't figure them out.
At least the truck is running as-is and I don't use it much so there's no big crisis, thanks for your help.