Normal Operation - With DRL
WARNING: This page is about a different car, the 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
When the headlamp switch is placed in the headlamps ON position, voltage is routed to the multifunction switch through circuit 15 (RD/YE). The multifunction switch then routes the voltage to circuit 13 (RD/BK) which then changes to circuit 1033 (RD/YE) before reaching the DRL relay 3. The DRL relay 3 then routes the voltage to the CJB through circuit 13 (RD/BK). The CJB then routes the voltage to the low beam headlamps.