No Voltage on Brake or Turn Signals for Harness on 2018 Nissan Pathfinder

Question:

2018 Nissan Pathfinder without factory trailer tow. I installed this trailer wiring kit about a year and a half ago and everything was working fine. The trailer brake and turn lights on both the left and right side are now not working. The running lights are working. I disconnected the harness where the flat 4 harness plugs into the the vehicle harness. Using a VOM, I get 12V on the running light circuit, but no voltage on either brake light circuit. I have removed and tested all 5 of the relays and they are all functioning. There is a 30A trailer fuse in the underhood fuse box and it is good. Any suggestions?

asked by: Robert H

Expert Reply:

It is very likely that the reason you aren't getting any power, and the turn signals and brake lights are not working on your 2018 Nissan Pathfinder with the T-One Vehicle Wiring Harness # 118670 is due to a faulty relay. You mentioned the fuse was good but there should be a pair of blue relays that are for the turn signals/brakes in the same box on the driver's side by the headlight. I added a photo showing this box with the relays.

What should fix the issue is by replacing the relays, and to do that you will need the Relay Kit for Nissan Aftermarket Tow Package # C57000.

expert reply by: Kyle S