"Standard" Wire colors to the controller:
Black, Battery Positive to controller
White, Negative Ground for Controller
Blue, Brake feed from controller to Trailer plug at back of truck
Red, tap into truck Brake light switch signal to tell controller to apply brakes
Remember, the above colors are just a GUIDE. your colors may be different, read the instructions! I have seen many factory harnesses that have a extra wire for dash lights (usually brown). Most controllers do not have "dash lights" so don't hook that wire up.
Toyota wire colors:
Black-Red: Fused Trailer Brake Controller Battery Feed
Green: Headlamp Switch to Vehicle Trail Lamps
Green-White: Vehicle Stop Lamp Switch to Brake Controller (Input)
Brown: Trailer Ground
Red: Trailer Electric Brake Feed From Brake Controller (Output)
Installing a brake control unit isn't very difficult. This task is made even easier if your tow vehicle is a late model and comes with a 7 Way Connector as part of the towing package. Toyota/Lexus Trucks with the Tow Package will have the wire connectors in place.
In this case, installation is as simple as mounting the brake controller
in a convenient, easy to reach place, usually under the dash, just above
your right leg and connecting the wires from the brake control to the wiring
harness and then plugging the harness into the harness located under the
On Toyota trucks, with the tow package, the factory provided a plug
under the dash to connect the brake controller. On the trucks I have done,
it is a plug, located up in the dash, just above left kick panel, up under
the dash. Its easier if you remove the kick pannel and use a light to see.
It may be hard to find because the factory may place the connector in a
blank plastic plug to keep the dust out, so it looked like it is being
used.You must have the factory plug harness to plug in (I
sell these, if you need one, hint, hint)
Then it is just a matter of connecting the harness up to your brake controller, according to the wires functions using butt connectors, and then plug it in. Mount the controller where your want it. I prefer to have it on the right side of the steering wheel, within reach of my right hand. Just screw the bracket right into the plastic dash panel (I know, it hurts!) I do stock factory custom made harnesses that will plug the Prodigy Brake Controller directly into the Toyota:
You MAY need to install the relays for your trailer brakes. You will
have to look in you owners manual to find the size and location, and any
relay you may need to install. Sorry, they are all different.
R and P
Carriages Trailer Sales
431 North Main Street
Seneca, IL 61360