Normal Operation - Vehicles Equipped With 4R75E Transmission
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.
When the transmission is placed in REVERSE (R), the digital transmission range (TR) sensor routes voltage to the parking aid module (PAM) and the reversing lamps through circuit 140 (BK/PK).