Normal Operation - Automatic Transaxle
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
When the transaxle is placed in REVERSE, the powertrain control module (PCM) sends a message over the communication network to the instrument cluster indicating the transaxle is in reverse gear. The instrument cluster then sends a message over the communication network to the smart junction box (SJB) indicating the transaxle is in reverse gear. The SJB then provides ground to an internal solenoid which routes voltage to circuit 140 (BK/PK) to the reversing lamps. Ground is provided to the reversing lamps through circuit 57 (BK).