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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 - Automatic Transmission

Normal Operation - Automatic 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.

When the PCM detects the transmission is in REVERSE (R), a message is sent to the 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 BEC through circuit 1679 (WH/YE) to power the reversing lamps.

The PCM sets DTCs if any faults with the digital transmission range (TR) sensor inputs are detected.

This pinpoint test is intended to diagnose the following:

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