Systems, vehicles, and methods for controlling trailer brake output circuits with a reduced upper limit of trailer brake output signals

A vehicle for controlling a trailer brake output circuit, the vehicle comprising:

• an input device configured to output a signal in response to receiving an input from a user;
• the trailer brake output circuit configured to output a trailer brake output signal;
• and
• an electronic control unit configured to:
• receive the signal from the input device, the signal being associated with the input from the user;
• limit the trailer brake output signal to a first value when the trailer brake output circuit outputs the trailer brake output signal in response to the signal received from the input device;
• and
• limit the trailer brake output signal to a second value when the trailer brake output circuit outputs the trailer brake output signal independent of the signal received from the input device, the second value being smaller than the first value.

A method of controlling a trailer brake output circuit of a vehicle, the method comprising:

• receiving, by an electronic control unit of the vehicle, a signal from an input device of the vehicle, the signal being associated with an input to the input device by a user;
• limiting, by the electronic control unit of the vehicle, a trailer brake output signal to a first value when the trailer brake output circuit outputs the trailer brake output signal in response to the signal received from the input device;
• and
• limiting, by the electronic control unit of the vehicle, the trailer brake output signal to a second value when the trailer brake output circuit outputs the trailer brake output signal independent of the signal received from the input device, the second value being smaller than the first value.