" Today we are going to install part number 90185 from Tekonsha. We are installing a Prodigy brake controller on a 2004 GMC Envoy. The first step here on the Envoy is locating the tow package. Which is located underneath the dashboard behind this plastic facing here. There are also 2 screws you must remove. One to the left and one of them to the right that hold that into place. So we are going to go ahead and remove those and pull this down. Then we will locate the wires that will be right up in here somewhere. The panel just pulls away but also be sure not to pull to hard because there is the diagnostic and Aux port over here that we do not want to pull any wires out of.
With the paneling pulled back you can look over here and there are 4 little wires an orange, dark blue, light blue, and a black. Which are taped to this main harness here. We want to go ahead and cut the tape thats holding those to the main harness and pull them out. Those are our 4 wires we are going to use to install the brake controller. With the wiring we are going to the black on the envoy here is going to go with the white on our Prodigy harness. The dark blue wire will go to the other dark blue wire. Orange will go to the black and this smaller light blue gauge wire will go to the red. We will go ahead and make those connections now. The Prodigy actually comes with the connectors necessary to make these connections. We have 2 for the smaller gauge wires and blue ones and yellow ones are for the heavier gauge wires.
Now that the connections are made here make sure they are nice and tight and are not going to come apart. We want to go ahead and tape those up. Now that we tape up the connects on our harness we have to find a descent routing method to go up and over the threshold. What we are going to do is route it in this opening here right above the gas pedal. You want to make sure that nothing is put in any area that will be pinched when we put the threshold piece back up. We want to leave a descent amount of length coming through here because we are going to go ahead and mount the brake controller in this area. To the right of the steering wheel. So we can kind of gauge how much wire we are going to need there. Any excess we can go ahead and zip tie up to some of the existing harnesses up here. Once we have figured out how much wire we are going to need for the mounting of the brake controller and we have already zip tied the excess wire. Now we can put the threshold piece back up. We will go ahead and find a good location for the mounting bracket here on the brake controller. We typically install brake controllers to the right of the steering wheel so it is easy to get to it. Just in case of an emergency braking situation. Again you want the mounting bracket to be in a straight line with the braking of the vehicle. You do not want it to be rotated left or right at all because it will minimize the effect of the Prodigy. 1/8 inch pilot holes. Then use the screws provided with the kit to go ahead and mount the bracket. Always want to go ahead and check behind the console where your going to be drilling to make sure there are no electrical components there.
Now that we have the brake controller fully mounted into place. All we have to do is plug the end of the harness here into the back of the controller. If you have any excess wire hanging down you can go ahead and fasten it up and out of the way. You can see with the brake controller plugged in we have a reading of 2 dots here. That tells you that you do not have a connection to a trailer. Even if you hit the slide bar it reads NC which means no connection. So you know everything is working just fine. When you go to the trailer you will get one dot which means your connected. You can also use the slide bar once more and it will number up to tell you what setting you have it on. That concludes our installation of the Prodigy part number 90185 from Tekonsha. Installed on a 2004 GMC Envoy.
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installation instructions and specs for complete information. "