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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Exterior Lighting System) >> Diagnostic Tests >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test R: The Fog Lamps Are Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The lighting control module (LCM) sends a voltage reference signal to the headlamp switch through circuit 477 (LB/BK). When the fog lamp switch is engaged, the signal is routed to ground. When a request for the fog lamps is detected (and the exterior lamps are on), the LCM provides voltage to the fog lamp relay coil through circuit 1347 (DB/WH). Ground for the fog lamp relay coil is provided through circuit 57 (BK). Voltage for the fog lamp relay is provided by the battery junction box (BJB) through circuit 1669 (OG/LG). When the fog lamp relay is energized, voltage is routed to the fog lamps through circuit 478 (TN/OG).

This pinpoint test is intended to diagnose the following:

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