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AUTOMATIC FOLDING MIRRORS TO IGNITION FOR S13.
This is a guide for exactly how i installed my auto folding mirrors, im sure it can be done differently but this is the process i took and the materials/tools i used.
(i was able to find a single wire that was running directly from the battery with the inline fuse already hooked up, so i tapped off from this, i am assuming that i didnt have this so the article will include how to wire directly from the battery). i have given each wire colours for the sake of the article.
The final product:
NOTE: you will not be able to attach BOTH the automatic relay with the manual switch, its either one OR the other. Before you begin, use the manual switch to make sure your mirrors are folded in. Im sure their is some crazy circuit which would allow both to be used.
If you want to avoid 95% of whats written below, i can sell you a premade relay with the wires, pm for details. Would be hell of alot easier to install.
Materials:
# Single DPDT relay
# ~6m 'hook up' general electrical wire (1m black, 2m white, 3m red)
# Heat shrink tube
# Solder
# 3x Ring terminal connectors
# 15A blade fuse
# Inline blade fuse holder
Tools:
# Fuse tester (light tester)
# Soldering iron
# Wire cutters
# Wire stripper
# Screw Driver (for interior removal)
# Spanner (for battery ring terminal connection)
Step One: Centre and Drivers Interior Removal.
Remove the whole centre console, including stereo surround, and all the interior plastics above the the drivers footwell (steering column cover etc..)
Step Two: Wiring of constant 12V feed.
Disconnect battery. Attach ring connector to the end of the red wire and connect to the positive terminal of the battery, run the wire with the loom back into the cabin through the firewall, up into behind the deck and then down where your manual mirror switch is.
Within any portion of the red wire appearing within the cabin, connect the inline fuse holder in series by chopping the wire and simply joining the fuse holder either end, before you solder cut enough heat shrink to cover the entire join, feed the heat shrink over the wire and solder the join, then pull the heat shrink over the join and heat/shrink it!
Once there is sufficient wire to reach, cut the excess as it will be required to split the constant 12V source into two points; cut two lengths and attach them to the end of the ignition wire ( 'Y' split).
Now two constant 12V feeds are hooked up ready to be attached to the relay.
Step Three: Wiring of 12V Ignition feed.
Lower the steering column so the back of the key barrel is clearly visible, you should see various wires soldered. Using the fuse tester find which soldered wire receives power when you turn the key to the ignition, solder the end of the white wire to this point.
Run the white wire down the steering column, through to behind the deck and upto where your manual mirror switch is (up with red wire).
12V ignition feed is now hooked up ready to be attached to the relay.
Step Four: Wiring of Ground wires.
Attach ring terminal connectors to the end of two black wires, ground each wire in a different spot to a bolt through the chassis (good grounding point near manual mirror switch), for one of the grounding points i used one of the bolts used to secure the main gear boot. run the black wires back up with the red and white wires.
Split the end of one of the ground wires by attaching 2 more wires (Y split).
First Ground with two inputs and the single Second Ground are now hooked up and ready to be attached to the relay.
Step Five: Wiring of mirror input/output.
The plug that goes into your manual mirror control switch will consist of a green wire and blue wire at either ends of the plug, as visible by the cut wires within the image below. The GREEN wire is for MIRRORS OUT and the BLUE wire is for MIRRORS IN.
Cut the two wires a few cm from the plug (just incase you decide to hook it back up in the future), strip back the lose wire (not the few cm of wire from the plug) and with any left over wire (sure you gotta have some) attach to the ends to extend the wire out more from the manual switch (extent atleast say 15cm - so you can easily get to the wires).
One MIRRORS OUT and one MIRROR IN connections are now hooked up ready to be attached to the relay.
Step Six: Relay Connection.
A total of 8 wires should now be present; (no particular order)
1) Constant 12V (red)
2) Constant 12V (red)
3) First Ground (black)
4) First Ground (black)
5) Ignition 12V (white)
6) Second Ground (black)
7) MIRRORS OUT (green)

The DPDT relay will also have 8 connections, , omfg, what a coincidence!
cut ~1-2cm of heat shrink and feed it up each wire. The terminals that the wires are required to be connected to are very small, to connect the wires i wrapped solder around the tip of the wire and then melted the solder next to each terminal. Once the wires are correctly joined (vertically), pull the heat shrink down to cover the solder and heat.
Six connections on the relay should be numbered 1, 2, 3, 4, 5, 6. Two unnumbered. Refer to diagram:
Written terminal schematic, for each terminal connect:
Terminal (1): First Ground
Terminal (2): Constant 12V
Terminal (3): Constant 12V
Terminal (4): First Ground
Terminal (5): MIRRORS OUT
Terminal (6): MIRRORS IN
For the remaining two terminals; to one terminal connect the Second Ground (black) wire, and to the other connect the 12V ignition feed (blue). all 8 terminals are now connected.
Final product should look something like this:
Once your confident that everything you have done is correct, reconnect the battery and insert the 15A fuse within the 12V constant red wire, now turn the keys to ignition, the mirrors should now fold out!
Enjoy.