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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1483 (Exterior Lighting System) >> Diagnosis And Testing >> Headlamps >> Pinpoint Tests >> Pinpoint Test A: Both High Beams Are Inoperative >> Normal Operation

Normal Operation

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

When the headlamp switch is placed in the HEADLAMPS ON position, the Smart Junction Box (SJB) monitors the high beam request circuit from the multifunction switch. When the multifunction switch is placed in the HIGH BEAM position, the signal is switched to ground, indicating a request for the high beams. The SJB then energizes the high beam relay (integrated into the SJB) which supplies voltage to the headlamps.

The SJB communicates to the Instrument Panel Cluster (IPC) (over the communication network) to illuminate the high beam indicator.

This pinpoint test is intended to diagnose the following: 

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