Reversing Lamps
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
On vehicles equipped with a TorqShift transmission, the powertrain control module (PCM) controls the function of the reversing lamp relay to provide voltage to the reversing lamps.
On vehicles not equipped with a TorqShift transmission, the digital transmission range (TR) sensor controls the function of providing voltage to the reversing lamps.