I got three little things finished today.
1: Replaced one of the two cigarette lighter sockets in my smokers kit with a blusea systems USB charger:
https://imgur.com/G6XQyQm
I also made it another step toward getting my subwoofer controller to sit in the ashtray, but that step is also the point where I realized it wont be possible to do the way I want. oh well.
2: finalized my 3rd brake light flasher installed. I really should have recorded what I did, but I only did one thing of note. so here is what I bought:
http://a.co/d/c5xQQLh
I followed the install instructions exactly in terms of wiring. I mounted it to the metal bracket supporting the LED assembly in the spoiler, which allowed me to mount it in the default orientation. Theres a plastic tab hanging off the light assembly towards the drivers side, in which I mounted a momentary-on 7mm push button switch I got at microcenter:
NTE Electronics Pushbutton Off-(On) SPDT - Micro Center, no modification required to add the switch. Made it much easier to program.
Truthfully, you could do this install without removing the spoiler. Toyota recommends that you replace 2 clips any time you remove the spoiler, but if you're careful when removing it, or dont remove it in the first place, theyre fine as is.
3: Finally fixed my AUX input with the Scion T1819 headunit. it takes a single 2.7k resistor to complete. If you install(ed) one of these units in a 4r, the adapter cable you need offers a really easy way to add the resistor.
On the body harness side, theres a 20pin connector, and you can use the resistor to bridge the wires that populate pin 19 (AUX detection) and pin 18 (ground/shield). The aux ground wire, since it's also used as a shield, is exposed underneath a protective rubber sleeve. I cut off the end of the sleeve, then put a dab of solder there before taping it. the other end, I removed about a mm of the jacket on the wire from pin 19 (Red and black on my harness) wrapped the end of the resistor wire around it tightly, dab of solder and more tape.
Only other thing I might do today is order tires. I might end up waiting to see if I can get a better price on falken wildpeaks.