It rained hard again, and "Service 4 Wheel Drive" popped up, so I took it to the dealership. Naturally, they told me it was the switch on the dash and not the actuator on the 4wd system. So, I have one of those at the house, told them I could replace that myself. I'll take pics of me replacing it, and if it comes back on, I swear to Buddha, feces will be slung. So, $75 for their time hooking it up to the latest and greatest code reader.