TIPM = Totally Integrated Power Module. and 06 was the first year to use it (congrats!).
It's a module that takes care of all your lighting functions. You have no fuses for lights, just the TIPM which senses an overload and kills power to that circuit until a dealer resets it for you. After a couple of resets, the TIPM burns itself out and you have to replace it.
One of our TDR members builds a very nice unit that goes in-line before your 7 pin connector and uses a battery input instead of the TIPM for actually powering the trailer lights. It has good old fashioned fuses that work just like they did before such idiotic things as TIPM's existed. However, you'll need to get your TIPM reset before anything.
FWIW, there was a s/w update that allowed your TIPM to supply more current before shutting down. You need to find a dealer that understands what a TIPM is (not easy) and how to reset and update it. Many dealers wrongly just replace it when it doesn't work when they should be resetting your old one.