InstallationDisclaimer: I have to state that I take no responsibility for this thread, or you, messing up your car when, or by, following these instructions. This worked for me, but different build date cars may be different and it is up to you to verify that these instructions and steps will work for you and yours. (Other legal disclaimers pending

)
OK, so first thing to do is remove the driver-side door panel. There are other, more detailed, posts on how to do this (such as:
Kappa Specific Sound Deadening Kits). But, basically, you unclip the small panel behind the chrome door latch, and undo the screw there, then undo the screw at the rear edge of the door panel. Then unclip the triangular panel under the main door pull handle and undo the two 7mm-head screws there. Then un-pop the panel with a panel puller, or your fingers, along the bottom edge of the door and slightly up the curve at the rear. Once, the panel is loose, lift the inner panel up off the top lip and lock post. Hold in place with one hand while you unclip the three electrical connectors and slide up and pop off the latch cable from the inside door handle. Carefully set the inner panel aside. (Actually, this is all easier to do than it sounds!)
OK, next step. There are functions (and wires) in the 530t module that I didn't want/need to use (remote window control and aftermarket alarm hookup). If you too don't need these, you can either cut these wires off; loop and tie them out of the way; or, do as I did and just use a dental pick to pull the wires and their pins out of the connector. This shows the three wires I mean (gray, orange and pink/white).

This is a diagram I prepared to show how the module wiring connects to the door harness, as shown from the rear (wiring side) of the connector that goes into the window switches. You should confirm that your wiring looks like this before proceeding - if any wire colors are different, note the changes. The dotted lines and lower-case italics denote the car harness wires and colors. The solid lines and upper-case colors denote the 530t module wiring. Note that some wires in the harness have to be cut, whereas others (ground and 12V) are joined. Also note that there are three ground wires in the module that are
all joined to the ground wire in the harness (No, I don't understand why this wasn't done internally in the 530t!):

Next, find a place to mount the module on the door. This is actually harder than I thought, due to the wires, wire anchors and various moldings etc inside the inner panel. I found the ideal position (for me, anyway) was to place it where the bottom right corner of the module was one inch to the left and one inch up from the panel clip hole shown - see the yellow lines/arrows in the following photo. You can drill holes and use screws to mount it if you like, but I just used sticky-back velcro. Please note my door interior will probably not look like yours... I have "SoundDeadenerShowdown" sound insulation installed (the gray mass-loaded vinyl and beige foam), puddle lights (the dangling brown and red wire pair) and Alpine SPR-17S speakers in place of the stock ones.

I chose to cut/splice the wiring at the yellow circle above, above the wire anchor. Strip off a 3"-4" section of the binding tape and cut the wires at different positions so there won't be a big bulge when spliced and taped back up. The following shows the wires cut and stripped - the gray wire is the only one not touched. Note that I just stripped a small section of insulation off the ground and +12V wires where I could solder to. If you are not comfortable with soldering, you could use clamp-on and butt connectors instead. Looking pretty scary here:

Here are all the wires soldered together and heat-shrinked. I used liquid tape painted liberally around the ground and 12V wire joins. Just as verification, the thinner (switch) wires from the 530t module are attached to the connector-end of the cut wires, while the thick (power) wires from the module are connected to the 'speaker' side of the cut harness wires:

Finally, all taped together and ready for the door panel to go back on. But before you actually do that, see the next post!

NEXT POST:
Optional Modification