These pictures are from the installation of my Pioneer "DFS" Alarm system that is a feature of the new Pioneer head unit that I put in.  Basically, the way this system operates is that when you turn off the car the motorized head unit moves down and you pull it out.  This activates the LED (now I have 2!) and the Alarm system and 30 seconds after you close the doors the alarm sets. (You can program how long the wait time is).  Then the next time you open the car door, you must either 1) Put the key in the ignition and turn it to "On" or else 2) re-attach the stereo faceplate within the predefined time (you can adjust this wait period).  If you don't, then the worst possible high pitched noise you can imagine starts pumping out of your speakers, enough to drive anyone in the car insane and alert people nearby.  There is a second wire coming from the stereo that also can be sent to a relay which in turn can flash the car's lights or honk the horn as well.  Granted this isn't a full bells and whistles alarm system, but until I get a good one installed this is better than nothing and is basically free because it came as a feature on my stereo head unit.  Here are the pictures of the installation, which turned out to be a little more in-depth than I had originally anticipated.

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Here's the schematic and the wire and assorted electrical work goodies that I purchased.  The schematic calls for the wire from the stereo to be connected to the far side of the dome light.  I thought this would be easy, simply run down the two wires from the dome light and figure out which one it is.

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Here's the white wire coming from the back of the stereo unit (actually white/yellow stripe), I patched in the black wire I purchased at the store using the electrical crimp coupling.  Now all I needed to do was connect it to the proper car wire.

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To get behind the dash I started taking it apart, yes I know, more car disassembly!  This kick plate is held on by 1 philips head screw and 1-10mm bolt. Note that the computer diagnostic plug is also clipped into this piece, but can be easily unclipped as shown here.

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Underneath the plastic kick plate is a metal kick plate, this attaches with 2 - 10mm screws shown here. I removed this as well which opened up a LOT of space under the dash, I could put a SUB in here... :-)

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For good measure I took the door sill off, it simply snaps into place with clips.  I examined the wiring harness here but could not find the color wire I was looking for. (At this point I was looking for a Red with Green Stripe as that wire at the dome lighted tested out as the one I needed to use.)

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At last I found the wires I needed, they are inside the black wire tubing that ran alongside the steel structure tubing.  I spliced in the stereo wire and the installation was complete.  What caused so much trouble was that this wire was actually Red with a White stripe at this point, somewhere between the dome light and under the dash the wire changed colors! :-)

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Here is another shot of where I patched into the existing wires.  Notice the steel tubing structure that is behind our dashes.  This is bolted to the side of the car, crawl underneath and have a look yourself!

 Well that's it, maybe not as exciting as some other things, but at least it shows you how to get under your dash where there is an incredible amount of room!  I also learned that I could stop that incessant door chime with the key in the ignition by disconnecting a white plastic plug that was near the steering column and just under the lip of the dash (it has two wires running into it, white/black and red/orange)  I reconnected mine when done.