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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 480 (Exterior Lighting System) >> Diagnosis And Testing >> Daytime Running Lamps (DRL) >> Pinpoint Tests >> Pinpoint Test AF: The Daytime Running Lamps (DRL) Are On With The Ignition Switch Off >> Normal Operation

Normal Operation

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.

The DRL relay 1 coil and input voltage is supplied by the central junction box (CJB) through circuit 295 (LB/PK) when the ignition switch is in the RUN position. When the DRL relay 1 is not energized (the parking brake is released), the DRL relay 1 routes voltage to the DRL relay 2 through circuit 175 (BK/YE). The DRL relay 2 then routes the voltage to the DRL relay 3 coil through circuit 1032 (WH/BK). The DRL relay 3 coil is grounded through circuit 57 (BK).

The DRL resistor receives voltage from the battery junction box (BJB) through circuit 554 (YE/BK). The voltage passes through the resistor to the DRL relay 3 through circuit 471 (OG/LG). When the DRL relay 3 is energized, the voltage is routed to the headlamps.

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