Pinpoint Test BA: The Trailer Lamps Are Always On - All
WARNING: This page is about a different car, the 2002 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
It is necessary for the vehicle exterior lighting to be operating correctly. Repair any concerns with the vehicle rear exterior lighting before the diagnosis of the trailer tow module (TTM) and wiring is attempted.