The relay is powered up and activated thanks to a small electrical current. When it is activated, it lets a current that is much bigger than the original one flow through other two outlets. It is used to control the headlights, the rear fog light, the electric fan, etc.
Replaced OEM headlights with LED lamps + canbus (to avoid flickering) - first the front left (driver) headlamp went out but plugging the actual lamp into the right side it worked - re-made connections, worked for a while, now both headlamps and running lights at front are out; replaced fuses - didn't help. Not sure that there isn't a bad headlamp relay.
Update: a conversation with the Xprite headlight manufacturer led to a recommendation to replace the lights and wiring - in process. I'll post an update here.
Tested with a power prob when putting power to the relay fuel pump turns on seems to have something with eds relay and ground coil not sure what fixes to try had help to get this far all relays in fuse box under the hood and fuses were good
Pressing the ac button the light comes on but compressor cools air for barely five second then shuts itself off light will come on and off intermittently at no pattern and will not cool air from then on has new compressor cleaned relay contacts fuse contacts new control unit module in dash i need help