Troubleshooting Brake and Turn Functions Not Working on 2004 Nissan Armada

Question:

I have a nissan armada pathfinder 04, bought from uhaul, the hitch the adapter 7 to 4 pins harness and the relay needed brown and blue that go in the under hood smaller fuse box, drove from FL to NC, last year, a trailer w/o issues, just recently hooked my trailer and I dont have Lt turn nor Lt brakes lights on the trailer, I disconnected the adapter harness from the truck and no power, checked the fuses, all good, bought the 04 Nissan relay set from you guys replaced the one on the under hood, no changes. as one of your post recommendations with the similar issues, looked on the dash, under the steering wheel, your pictures showing two little blue relay, but my truck have only one, Please help Thanks

asked by: Herbie

Expert Reply:

For your 2004 Nissan Pathfinder Armada, you will first need to check your trailer wiring at the vehicle side connection for function. If it doesn't work there, we can focus on the vehicle first and see if the trailer is okay later.

If your trailer connection on your vehicle shows the same issue we start there. It sounds like you have already replaced the relays under the hood from kit # N40975. I've attached the video for your model year and it only requires the two relays as you stated. If the relay has been replaced, then the only thing you can do is trace the wires from the 7-way back to check for function using a circuit tester like # PTW2993. It sounds like you have a wire short and will need to probe the wire insulation every few feet to determine where the short is. Then you will need to replace the wire with # 16-1-1.

If you have power at your trailer connection for these functions on the vehicle side, then we have isolated the issue to your trailer. Most of the time when one function doesn't work, it is a ground issue. Start by making sure your ground connections are bare metal to metal with no rust or corrosion. Once you have determined the ground connections are good, then you will use your circuit tester to search for a short on the wire to your left turn signal and brake. Normally this is a yellow wire, but not always. If the colors don't match, you can determine the correct wire from checking your wiring connector and matching function location. I've attached an article to assist.

expert reply by: Jason S