The 6-pin JDM STi HID and the 4-pin EDM STi leveling switches ARE different and work off of different controls schemes for the leveling motors. Both systems adjust the headlights (both low and high beams) up or down to 4 discrete positions for a total travel of what I hear is 6 degrees (2 degrees per step, which is a lot).

4-pin: 83011FE000 Europe
6-pin: 83011FE010 JDM

The JDM leveling control scheme works off of a control signal from any of 4 leads on the motor, each representing a position 0,1,2,3. For example when lead 2 shows 12V, the headlight is adjusted to position 2, etc. So, the switch has 6 pins; the 4 control leads, a 12V feed, and an “illumination” ground.

The EDM leveling control scheme works off of a varying voltage on 1 lead to determine whether to adjust to position 0,1,2,3.

The control lead(s) from the switch are low-current “control” leads. The power and ground to actually operate the leveling motor is supplied to separate leads at the headlight. This is important, because, especially for the JDM leveling system, it allows us to use a small-gauge multi-wire cord, which is easier to get through the firewall.

I didn’t have a Plug-N-Play anything, just the lights and the switch. So, I went to my favorite full-on electronics store (which are a dying breed). My Radio Shack didn’t have what I was looking for, but this place did: blade-type quick disconnects with 0.110” stud size. The female connectors are insulated, and fit perfectly on the switch terminals.

Wire taps were used to take the 12V from the Violet (V) wire and the “illumination” ground from the Orange/White (OrW) wire on the cruise control switch. Then the tricky part is keeping the correct orientation of switch and pin numbers. In the picture, the switch is “right-side-up”, but the numbering starts from the bottom.

The last part was posted late last night before the router went down. Here's the rest...

To top things off, Subaru used a switch with 8 pin locations, but 2 of the “pins” are plastic and unused. To be consistent with Subarus wiring, all 8 locations are accounted for. The connections as shown in the picture are:
Pin 1 Dummy – N/C
Pin 2 12V Red (from Violet)
Pin 3 switch position 2 Yellow
Pin 4 switch position 3 Green

Pin 5 Dummy - N/C
Pin 6 switch position 1 Blue
Pin 7 switch position 0 small Red
Pin 8 “illumination” Ground Red with black stripe (from OrW)

As seen in the pictures, the 4 small control leads are a 4-wire phone-type cord. I used 26 gauge stranded. It’s adequate, but I would’ve been more comfortable with a larger wire size. The phone cord is the only thing from the switch that goes through the firewall to the headlights.

To wire the cord to the headlights, I found that the colors didn’t match the wiring diagram I came across, so I went by pin location
Pin 1 switch position 0 small Red
Pin 2 switch position 1 Blue
Pin 3 switch position 2 Yellow

Pin 4 switch position 3 Green
Pin 5 12V Power lead
Pin 6 Ground (the black wire here matched the wiring diagram)

For power and ground at the headlight leveler, I piggy-backed on the HID ballasts, since I was wiring them at the same time and they were mounted close by.

http://www.scoobymods.com/forums/showthread.php?s=&threadid=2404

For the left headlight, I doubled up on the wires per terminal connection for the 4 control leads and ran cord from this to the right side headlight.