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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1691 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test B: One Low Beam Headlamp Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

The lighting control module (LCM) is supplied voltage from the central junction box (CJB) through circuits 1055 (WH/LG) and 1056 (DB/LG) for the LH and RH low beams or ballasts. When a request for the low beams is received by the LCM, the LCM provides voltage through circuits 160 (DB/WH) and 161 (DG/OG) to the LH and RH headlamps. Ground for the low beams or ballasts is provided through circuit 57 (BK). When the voltage is received from the LCM, the ballast provides the high voltage necessary for the high intensity discharge (HID) bulbs to illuminate.

This pinpoint test is intended to diagnose the following:

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