I've been asked for more "detailed" information on doing this wiring from several members, so here is a little more detail that will hopefully help someone out when wiring their radar detector to the mirror wiring:

1. Don't take your mirror apart, just unplug the connector from the back of the mirror.

2. Their is a little black plastic cover that is easily removed that hides the wires from the headliner to the mirror bracket. The wires you need are under that cover. Remove the cover.

3. Slide the thin plastic tubing back that shrouds the three wires that were previosly covered by the black plastic cover.

4. Now you should have access to the wires. One is black (ground), one is black with red tracer, one is black with orange tracer. You need black and black with red tracer for this job.

5. I didn't cut the wires, just skinned the insulation off of the black and black with red tracer so I had a section about 3/16" with no insulation on it.

6. Look at the RJ11 connector diagram I posted. I can't tell you what colors your phone connector will have, and they will be reversed from end to end. Cut the cable the length you need.
The center two conductors are the ones needed for power & ground. Strip the ends of these conductors.

7. Looking at the drawing I posted, determine which color in the phone connector is ground, and which one is power. Carefully wrap the stripped end of the phone wire around the skinned places in the mirror wiring.

8. Be careful that they don't touch, plug in your Passport, and turn on the ignition. It should power the passport. IF not, switch the two wires. It won't hurt the Passport if they are backwards for testing.

9. When you are satisfied that it is wired correctly, solder the connection. I used a small pencil soldering iron. Wrap a small piece of electrical tape over each connection.

10. Pull the plastic tubing back down over the wires, plug mirror connector back in, replace plastic cover (pull sections apart for tight fit). You're done.