I finally found the problem with the '06, but you're not going to believe what it was.... The turn signal bulbs themselves. It seems it doesn't like the Sylvania Long Life bulbs. The lens was cracked on the turn signal and when we replaced that, we replaced the bulbs. The new ones were 1157LL's. After that is when we started having problems. A few weeks went by before my son finally came and asked for help. I spent a couple weekends trying this and that all with no luck. Finally I swapped the bulbs from the passenger side to the drivers side, and visa-versa, and the problem moved! Pulled an compared both bulbs and the only difference was the new ones were 1157LL. Went to the local parts store and picked up straight 1157's, problem solved!

I know, I couldn't believe it either.