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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 928 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test B: The Low Beams Are Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The smart junction box (SJB) receives voltage from the battery junction box (BJB) through circuit 785 (BK/LG). The SJB sends a reference signal to the multifunction switch through circuit 1033 (RD/YE). When the multifunction switch is placed in the HEADLAMPS ON position, the voltage signal is routed to ground through circuit 570 (BK/WH). When the SJB detects the multifunction switch in the HEADLAMPS ON position, the SJB sends voltage to the headlamps. When the SJB detects the multifunction switch in the HEADLAMPS ON and LOW BEAM position, the SJB sends voltage through circuits 161 (DG/OG) (RH headlamp) and 160 (DB/WH) (LH headlamp) to the low beam headlamps. Circuit 57 (BK) is the ground circuit for the headlamps.

Possible Causes

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