Diagram of my Coupe's relays and wiring (including foglights):
"Hi" and "Lo" diamonds are the stock harness signals
The SPDT relay switches the low beams to extra low by raising their
ground to 12 v and disabling the normal feed. This puts them in series.
Very handy in to reduce glare when fogs are needed. The NO relay
is necessary to avoid an exXxplosion if the "flash to pass" feature is
used while in extra low mode.