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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1012 (Exterior Lighting System) >> Diagnostic Tests >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test Q: Both Fog Lamps Are Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The smart junction box (SJB) sends a reference signal to the headlamp switch through circuit CLF29 (BN) to monitor the fog lamp request. When the fog lamp switch is engaged, the voltage signal is routed to ground.

When the SJB detects the fog lamps on request, the SJB provides ground to the fog lamp relay coil (integral to the SJB). When the fog lamp relay is energized, voltage is routed through circuit CLF12 (BN/YE) to the fog lamps.

This pinpoint test is intended to diagnose the following:

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