What to Check for When Troubleshooting Trailer Tow Harness on a 2013 Honda Pilot

Question:

I checked all the fuse and everything and replace new trailer light system but my right side of lights dont work Im not sure what is going on. I have a after market towing harness installed.

asked by: Z

Expert Reply:

Troubleshooting wiring can be frustrating because even the smallest thing can cause issues. Here's what you'll need to check:

- All connections for problem circuit
- All grounds for problem circuit
- Vehicle side connector
- Trailer side connector
- Fuses and relays
- Wiring going into and coming out of module box (black box included with T-One # 118265)
- No bends, breaks, or exposed wiring

Knowing which end of the towing setup the issue is on (vehicle or trailer) helps to isolate where you need to be checking for issues. Aside from that it's basically just checking all of the related components and seeing where there is an issue. Worst case scenario the black module box is bad and you need to replace the tow wiring on your vehicle. You will know the module is the issue if you see power going into it but not coming out.

I'm linking a helpful article on troubleshooting 4-Way wiring for you to check out.