COMBINATION OF TRAILER BRAKING AND LIGHTING FUNCTIONS

A towed vehicle controller integrates trailer braking, lighting, and battery charging functions into a single unit communicatively coupled to a towing vehicle data bus. The controller includes a processor, a trailer brake controller component, a trailer lighting component with multiple light drivers, and a trailer battery charge component. The processor receives inputs via the vehicle communication bus and other interfaces, executes brake control algorithms, coordinates activation of trailer lamps, and manages trailer battery charging, including foregoing charging based on braking state or vehicle conditions. Integration of these functions reduces wiring and component count, facilitates OEM or aftermarket installation, and enables coordinated control, diagnostics, and display of trailer status through the towing vehicle's existing electronic systems.