Troubleshooting DO NOT use scotch-lock or t-tap connectors. twist and tape , solder, or crimp all connections.The Bypass and Radio must be a good clean metal around. To rule out a bad ground, try a new ground by simply jumping a ground wire from the existing around connections to clean metal grounding point in the vehicle .(This is the most common issue in Nissan and Subaru Vehicles.)Temporarily disconnect any other wires turn on lead. Temporarily disconnect any other wires at this connection to determine if this is the issue. If this is the problem, diode isolation may be needed.WARNING! It is dangerous (and illegal in most states) for the driver to watch the video monitor while driving the vehicle.The driver may be distracted from looking ahead and an accident could occur.Install the Bypass only in Retail Display. RV, or Marine applications where there is no parking brake to interface to.Do not install the Bypass where the driving may be able to view the monitor where driving.Installation InstructionsConnect BLACK wire on Bypass to BLACK wire [Ground(-)] on Alpine Radio (Also Connect to the Vehicle?s Ground wire) Connect BLUE wire on Bypass to BLUE/WHITE STRIPE wire ( remote turn on (+)) on Alpine Radio (This connection can also be shared with Amplifiers if Present) Connect YELLOW wire on Bypass to YELLOW/BLUE wire [Parking Brake(-)] on Alpine Radio only-do not connect to vehicles actual parking brake wiring/circuit Connect GREEN wire on Bypass to YELLOW/BLACK wire [Foot Brake(+)] on Alpine Radio only-do not connect to vehicles actual foot brake wiring/circuit , no connection if not present on Alpine harness