03 The Smart Shift control box must be placed in a dry location, which is one reason we chose the center console. The box requires a switched power source and ground. Hookups for a dimmer switch and a gear selector display are optional. See the brown wire? This is a brake input wire, which connects to the vehicle's brake light switch. It's a safety feature that ensures shifts into Park or reverse can only be accomplished when the brake pedal is depressed.