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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1012 (Exterior Lighting System) >> Diagnostic Tests >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test U: The Reversing Lamps Are 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.

Voltage is supplied from the battery junction box (BJB) fuse 35 (20A) to the coil side of the reversing lamps relay through circuit CBB35 (YE/GY). The reversing lamps relay switch side is supplied voltage by the BJB fuse 7 (10A) through circuit SBB07 (WH/RD). The reversing lamps relay coil ground is controlled by the digital transmission (TR) sensor (non-hybrid with automatic transaxle), the reversing lamp switch (non-hybrid with manual transaxle), or the PCM (Hybrid) through circuit CLS28 (BU/WH). When the transaxle is in REVERSE (R), the digital TR sensor completes the ground path through circuit GD120 (BK/GN) to energize the reversing lamps relay. When the reversing lamps relay is energized, voltage is routed to the reversing lamps through circuit CBB07 (GN/BU). The reversing lamps share a common ground through circuit GD182 (BK/GY).

This pinpoint test is intended to diagnose the following:

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