Normal Operation
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The headlamp switch sends power through circuit 13 (RD/BK)/15 (RD/YE) to the daytime running lamps relay, then to BJB fuses 42 (10A) (RH headlamp) and 43 (10A) (LH headlamp) through circuit 13 (RD/BK). After passing through the fuses, voltage is then carried through circuits 161 (DG/OG) (RH headlamp) and 160 (DB/WH) (LH headlamp) to the low beam headlamps. Circuit 1205 (BK) is the ground circuit for the headlamps.