I am attempting something that is above electronics level but i am willing to learn. I also hope to receive positive feedback as i know most automotive topics gets shut down quickly and frowned upon
My vehicle has power mirrors, but i have to switch the button on the dash to have them collapse or extend. I want to make this process automated with my central locking.
I attach a picture of the wiring diagram, here i marked the red star is where the ignition switched 12V+ comes into the circuit, then at the black start is where the GND exits. where the green star is where the manual switch is, it acts like a DPDT switch basically, switching the GND and 12V+ around to make the mirror motors collaps or extend.
I have the following in mind:
DPDT relay exactly where i have the green line drawn, this, when the relay is powered by IGN 12V+ it will keep the circuit basically the same and while driving the vehicle and pressing the manual button will still collapse the mirrors, if IGN 12V+ is turned off the relay must switch to normally open off state and will wait for an input from the arduino. the arduino must sit and wait for a pulse from the central locking motor to then collapse the mirrors and extend the mirrors when unlocked.
Am i on the right path? Will the arduino be powered 24/7 causing too much power draw leading to a flat battery? is there any experts that is willing to help me in the right direction?