Troubleshooting Trailer Turn Signals Not Functioning on a Nissan Frontier

Question

Question:

just purchased a new trailer. Brake lights and turn lights will not work. I have a Nissan Frontier and was told a need a special adaptor because my brake and turn bulbs are different in the truck

asked by: Alex

0

Expert Reply:

Most likely you have a some missing or blown relays on your Nissan Frontier as this is a fairly common issue.

The relays are available in the Curt Relay Kit # C57000. The blue relays control the turn signals, and it sounds like that's what you're missing. I've linked you to a photo showing where the relays are usually located, and also to a video showing the same thing.

expert reply by: Jameson C

0

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Answer 1

Trailer running lights not working with certain Nissan vehicles is a common problem with an easy fix. There is a relay for the trailer running light circuit that is located in the fuse box (in the cab). If that relay is missing or no longer…

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Answer 2

The relay location on Nissan vehicles can be interesting. A lot of times on the Frontier it's behind the kick panel on the passenger side like where you checked but the other common location is under the dash to the left of the steering…

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Answer 3

You will first want to check the fuses on your tow vehicle. Some vehicles could have fuses for operating the turn signals and brake lights of a towing package. You will want to check if they are installed and working properly. The next thing is to…

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Answer 4

There is more than likely a separate fuse and or relay that controls the right side trailer brake/turn signals and the left side trailer brake/turn signals. This fuse should be located in the power distribution center under the hood of the vehicle…

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Answer 5

What you are experiencing is actually not terribly uncommon on Nissan vehicles like your 2018 Frontier. There is a dedicated relay for the trailer running light circuit that should be located in the fuse box inside the cab. I simply recommend…

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Answer 6

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 7

On certain Nissan vehicles like yours a 4th blue relay is sometimes needed to activate the trailer running lights circuit. This appears to be the case with your 2018 Nissan Frontier. The blue relay that you need is included in the Curt Relay Kit…

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Answer 8

No, the minimum air pressure is 5 psi and the maximum is 100 psi. The 40 figure comes into play based off of the instructions which state that generally the system can support 40 pounds per 1 psi of air pressure. I have linked the installation…

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Answer 9

Sounds like you have been troubleshooting the wiring and have found that the problem is somewhere on the 2005 Nissan Frontier side. You said the right turn pin is not showing current when you check it out. The next place to check would be on the wire…

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Answer 10

This sounds like a ground problem on the right side. The turn signal not working makes sense because with the brake lights, there is a constant signal coming through which is enough to make the lights illuminate on both sides like they should. But…

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Answer 11

Thank you for describing the trailer lighting issue you're having and the testing/troubleshooting steps you've taken to diagnose the cause. If I understand correctly you have a 4-pole harness such as #HM43575 which does indeed plug in to the…

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Answer 12

The 4-way on your trailer is what's known as a wishbone connector like part #A35W42B. Two of the wires are the running light circuit which is a little easier to install since you can run one down each side of the trailer. This way you don't…

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