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Switch 12 Volt Power and Electric Brake Wire on Wire Harness for Nissan Xterra, Frontier, Pathfinder

Question:

I have a 2011 Xterra and it already was set up with a 4 pole wiring harness. I added the 7 pin wiring harness and a brake controller 90885-3050-P. After installing everything, when I hook up my trailer, I get the code that tells me the trailer is not connected to the controller. I rechecked all the connections and grounds, no help. I saw that another customer that bought this wiring harness had to change the black and blue pins around. Is that is what is wrong with mine too? I did call and was told to try and see if I have power at the 7 way plug blue wire when the brake is stepped on. I did not get any voltage on the blue wire, but my brake controller also said unconnected. The only terminals that showed 12 volts with brake on were the yellow and brown. I did shows 3 volts on another wire, but not sure which one that was. All of my lights work properly, but I have no brakes per the reading on the controller Tekonsha. Please help as this is getting frustrating.

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Expert Reply:

We have heard of the issue you are experiencing and it is related to the black 12 volt power wire and the blue electric brake wires on the vehicle. It is not very common, but it has come up before. The problem is that the factory tow package connector on a few of the Nissan Xterras, Frontiers and Pathfinders from 2005 to 2012 had the 12 volt power and the electric brake wire switched. This is the connector that the black connector from your Tow Ready Wiring Harness, # 118267, connects to. There is really no rhyme or reason and Nissan cannot say which specific vehicles are affected. It appears to be a random factory mix-up.

There are two things you can do to resolve this. You can cut the wires a few inches back from the black connector on the Tow Ready harness, switch them and butt connect them back together (see photo). If you cut them close to the black connector then the wire gauge difference will not be as much of a concern because the 12 volt power will only travel on the smaller gauge blue wire for a short distance.

The other option is to re-pin the connector. This method is not very easy and could potentially damage the connector if not done properly. I made a short video for you showing how to release the pins from the connector to switch them up.

click to enlarge
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John H

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