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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 >> Autolamps >> Pinpoint Tests >> Pinpoint Test G: The Autolamps 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.

When the headlamp switch is placed in the AUTOLAMPS ON position, the voltage signal is routed to ground. When the Smart Junction Box (SJB) detects the headlamp switch in the AUTOLAMPS ON position, the SJB  monitors the light sensor input. The light sensor determines the amount of light based on the input received from the ambient lighting conditions. When the ambient level has reached a point (determined by the internal programming of the SJB  ), the SJB  provides voltage to the headlamps, parking and license plate lamps.

This pinpoint test is intended to diagnose the following: 

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