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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1012 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test B: One Low Beam Headlamp Is 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.

When the smart junction box (SJB) detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB provides voltage through circuits CLF04 (BN/BU) and CLF05 (BU/GN) to the LH and RH low beam headlamps, respectively. Ground is supplied through circuit GD120 (BK/GN).

DTC B2A2E (Right Front Lamp Low Beam Circuit Open) - is an on-demand DTC that sets when the SJB detects an open in the RH low beam output circuit.

DTC B2A2F (Right Front Lamp Low Beam Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground in the RH low beam output circuit.

DTC B2A30 (Left Front Lamp Low Beam Circuit Open) - is an on-demand DTC that sets when the SJB detects an open in the LH low beam output circuit.

DTC B2A31 (Left Front Lamp Low Beam Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground in the LH low beam output circuit.

This pinpoint test is intended to diagnose the following:

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