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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1214 (Exterior Lighting System) >> Diagnosis And Testing >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test R: Both Fog Lamps Are Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) sends a voltage signal to the headlamp switch 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 (integrated into the SJB  ). When the fog lamp relay is energized, voltage is routed to the fog lamps.

This pinpoint test is intended to diagnose the following: 

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