WHat is the purpose of the integrated Relay Unit?

Also, does anyone have schematics for the combination switch that turns on/off the headlights?


Thanks.

 

wiring manuals:
https://www.scionlife.com/forums/viewtopic.php?t=138455

diagrams.. should serve useful

relay units are nothing more than a means to control power going to something by another means

perhaps using a small electrical signal to power a relay that will control a larger electrical signal.. or power source.. or something..