I wanted a auto dimming mirror but I didnt like the ones from the Explorers. So I found one in a 02 Grand Cherokee and brought it home:
There are 5 wires on this one. The wiring diagram is here:
There are only 2 wires we are concerned with:
Black w/ Light Green Stripe = 12v Switched
Black = Ground
The other wire you can hook up is the Black with Violet Stripe if you want. That can go to your back up lights. It wont auto dim when you put it in reverse.
The other 2 wires Black w/ White(Auto Dim +) and Black w/Yellow(Auto Dim -) go for the auto dimming side mirrors on the Grand Cherokee.
Test it out on your bench. I used a battery charger on 10 amps with a 10 amp fused wire coming off the positive clip. Black w/ Green to Pos, Black to Neg. Turn the mirror on by pressing Auto. You should have a green light. Shine a flashlight into the mirror. You should see the mirror dim a little, just enough to take off the glare. I tested it with the lights in the garage on and off. If it tests good, time for the install!
Pull off your mirror. Mine just lifted off, which scared the crap out of me because I wasnt expecting that. Unclip the harness from the new mirror and proceed to wire it in.
Since I have the OHC installed I just tied into the grey/yellow wire(12v switched) and black(ground) on the OHC harness with tap connectors. These are the wires on my truck, yours might be different, so please wire accordingly.
Turn on your ignition and push the auto button. You should have a green light. Do the flashlight test again. You should have the same results as you did when you tested it on your bench.
Now I realized with the OHC the arm on the mirror is shorter that the original one, so it looks a little crowded. It works for me for now, but this might be a point of concern for the OHC folks. Later on I will move the mounting button down enough to let it clear.