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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 721 (Exterior Lighting System) >> Diagnostic Tests >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test S: The Fog Lamps Are On Continuously >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The fog lamps receive voltage from the fog lamp relay (when energized) through circuit 478 (TN/OG). The fog lamp switch (integral to the headlamp switch) is supplied voltage through circuit 195 (TN/WH). When the fog lamp switch is engaged, voltage is routed to circuit 188 (WH/BK) which flows to the fog lamp relay coil. The fog lamp relay coil is grounded through the high beam circuit.

When the fog lamp relay is energized, the relay routes voltage from the central junction box (CJB) fuse 17 (15A) to circuit 478 (TN/OG) which supplies voltage to the fog lamps.

Possible Causes

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