Okay! I figured it out on my own - here's some things you may wish to check for in the Power and Winter mode buttons, and a little information on the wiring:
To get at the wiring and buttons, do the following: With the vehicle off, apply your parking brake and/or block the wheels. Put the gear selector in 'L' or '1'. With a phillips-head screwdriver remove the three screws in the base of the main shifter knob. Push the selector button in and pull the knob up along the length of the selector's shaft and the grip will come free. You'll probably have lost the button at this point so dig around and find it. There's a spring about 1.5" that should have stayed inside the grip - make sure you still have that, too. Unscrew the 4WD mode selector's knob - just spin it to the left. You now need to free up the between-seat console. Four screws hold this in place; 2 on the sides near the front and 2 on its sides at the rear. Once it is loose move it out of the way a bit to remove the screw at the rearward-facing base of the shifter console. Two more screws on each side towards the front of the shifter console hold this in place. Move the main gear selector into whichever gear you need so that you can start to wiggle the console off and forward. You won't get very far, but should now have enough room to reach your hand to the frontward-facing side of the console and disconnect the two wiring harneses. They both have little tabs on the firewall-side that can be compressed with a finger to free up the harnesses. Squish the rubber boot on the 4WD selector. It stays on, so you should be able to wiggle it through the hole and completely remove the shifter console. You now have access to the wiring, buttons and lights underneath.
Wiring information and some troubleshooting: The harness for the buttons has 5 wires; 3 are for the switches and 2 for the LED's that illuminate them. Both buttons are push-button types that complete the circuit momentarilty to signal the transmission unit to turn on whichever mode you're looking for.
Switch harness: Blue wire /w green stripe = power button (switched) Blue /w black = winter button (switched) Black = Common to both switches Green w/ red = 12V (+) for LED's that illuminate buttons Red w/ green = (-) for LED's
By momentarily shorting either of the two switch wires to the black wire in the 5-wire harness, you should be able to rule out whether your buttons are faulty or not. In my case, the Winter button was broken off and was completing the circuit and not allowing the Power mode to engage.
You don't need to reinstall the console to test, just replace the gear selector grip. Make sure the engine is running and gear selector is in 'D' when you momentarily short the above switch combos. If the mode you selected is working, you should have 12 volts to the one of the corresponding wire combinations in the indicator light harness.
Indicator light harness: Blue wire = 12V (+) for 'winter drive' light Green wire = 12V (+) for 'power drive' light Yellow wires = (-) for both lights
To reinstall the consoles and wiring: Simply reverse the order of the removal steps. Note for re-installation of the main gear selector grip: Make sure the angled side of the plastic 'arrow' is facing left and, with the spring and button on grip installed and pushed in, slide the grip back down the shaft and reinstall screws. Check to make sure that the button and selector operate properly before going anywhere.
That's all I got - add anything you think might be relevent. This is pretty basic, so I hope I didn't insult anyone by posting it, but I thought I would share it anyways. Using the info I gathered, I'll be installing some basic push-button switches in place of the OEM buttons, if I can't find a replacement from a junkyard.
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