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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 >> Parking, Rear and License Plate Lamps >> Pinpoint Tests >> Pinpoint Test O: The Parking, Rear Or License Plate Lamps Are On Continuously >> 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.

The smart junction box (SJB) sends a voltage reference signal to the headlamp switch through circuit 1401 (BK/LG). When the headlamp switch is placed in the PARKING LAMPS ON position, the SJB provides voltage to the parking, license plate and side marker lamps.

DTC Description Fault Trigger Conditions
B1470 - Lamp Headlamp Input Circuit Failure A continuous and on-demand DTC that sets when the SJB detects a short to ground from the headlamp switch input circuit (parking lamps).
B2035 - LF Side Repeater Lamp Output CKT Failure A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the side marker lamps voltage supply circuit.
B2491 - RF Park Lamp Output Circuit Short to Battery A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the RH front parking lamp voltage supply circuit.
B2493 - LF Park Lamp Output Circuit Short to Battery A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH front parking lamp voltage supply circuit.
B2523 - License Lamp Circuit Failure A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the license plate lamp and both tail lamp voltage supply circuits.

This pinpoint test is intended to diagnose the following: 

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