Troubleshooting Curt Wire Harness C53MJ On 2026 Acura MDX - No Turn Signals
Updated 03/06/2026 | Published 11/19/2025
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Question:
So, I have a 2026 Acura MDX tech package and installed the C53MJ trailer light part. I followed the directions and installed the 2 fuses as directed. I still do not have turn signals. Any thoughts. I tested my ground is good.
asked by: Don D
Expert Reply:
Hello Don, thanks for reaching out. Problems with these plug and play harnesses like the Curt # C53MJ are not common, but there are a few things we can check. First make sure the fuses are fully inserted and seated. Also make sure the plug that goes to the factory harness is plugged in all the way. If all of that checks out, the next step will be to test the converter module using a wire probe like part # PTW2993. Check the input wires going from the factory harness to the module and see if all signals are normal. They check the output wires on the 4-flat side and compare your findings. If the turn signal wire tests normal going into the module, but the output isn't there, this means the module is bad and needs to be replaced.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Powered Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Hidden
- CURT
more information >
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on Custom Fit Vehicle Wiring
Jesse M.
12/8/2025
Hey Don, how did things go after you checked the fuses and tested the converter module on your MDX wiring harness? Knowing what you found with the probe test could help others troubleshoot similar signal issues.