[KevinH1990]

I made some progress today. I'm using an old computer power supply to test some ideas. The supply provides 12 volt, 5 volt and 3 volt power. The seat mechanism is hooked up to 12 volt and the memory function to 5 volt. I attached the red/black wire from the 3-wire plug to the 5 volt source and the brown wire to ground. As you can see in this Youtube video: https://youtu.be/LFAfb2JiGi4 the system is able to store and recall settings. (I unplugged the power source, and when I plugged it in again, the system was able to recall the settings.)

Rather than run a wire to the relay carrier to obtain 5 volt power, I'm considering the purchase of a device like this Amazon.com: KEEDOX® DC/DC Converter 12V Step Down to 5V 3A Power Supply Module: Electronics

This will convert the 12 volt power already at the seat to 5 volt power.

I still need to decide whether adding the mirror control is feasible, so any thoughts on that part of the job are welcome.