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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Exterior Lighting System) >> Diagnostic Tests >> Daytime Running Lamps (DRL) >> Pinpoint Tests >> Pinpoint Test W: The Daytime Running Lamps (DRL) Are Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is in the RUN position, the parking brake is not applied and the headlamps are not requested on from the headlamp switch, the Smart Junction Box (SJB) provides a pulse-width modulated (PWM) voltage to the low beam headlamps. This illuminates the headlamps at a reduced intensity.

This pinpoint test is intended to diagnose the following:

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