Beagle- Same thing happened to my truck last winter. All the 4wd lights came on, but I had no 4wd. Anti-lock brakes wouldn't work. Wouldn't shift into overdrive. Had the same thing winter before last and Toyota said it was a wiring harness and fixed it under warranty. This winter though they said a rodent had chewed the wiring. Cost me almost $600 to fix it. I think that was the problem the first time, they just didn't catch the fact that it had been chewed on. Have also had them ruin the ignition wire on my 4 wheeler and my brother had one in his motor home that caused a lot of damage. Toyota said that they have been told they like to chew the wiring because they use vegetable oil in the coating. Don't know if that is true, but for some reason they do like to knaw on them.