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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 >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test T: Both Reversing Lamps Are Inoperative >> Normal Operation - Manual Transmission

Normal Operation - Manual Transmission

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 powertrain control module (PCM) sends a voltage reference signal to the reversing lamp switch through circuit 1789 (VT/WH). When the transmission is placed in REVERSE (R), the reversing lamp switch closes and routes the signal back to the PCM through circuit 359 (GY/RD). The PCM then sends a message to the smart junction box (SJB), through the instrument cluster (IC) gateway function, over the communication network. The SJB then provides voltage to the reversing lamps. The SJB is provided voltage from the bussed electrical center (BEC) through circuit 1679 (WH/YE) to power the reversing lamps.

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