No Signal or Function on Trailer Harness on a 2007 Acura MDX
Question:
I have a 2007 Acura MDX with the #118424 wiring harness. This weekend I hitched to a friends trailer, evidently there was a short in the trailer wiring and the lights stopped working. I now do not have any power for lights in my traler wiring harness, can you tell me what fuse feeds the plug?
asked by: Jerry M
Expert Reply:
As far as I can tell, one of two things has happened. Either the tow wiring fuse has blown or the Modulite box on the harness has burned up. A short on the trailer could cause either of these and both would lead to no signals at the connector. I will walk you through a process to diagnose which is the root of the problem.
Using a circuit tester, like part # PTW2993, go to the back of the vehicle where the harness is attached. Un-plug the trailer harness and check the pins on the vehicle connector. Match the colors on the harness pins to the pins on the vehicle connector. Red is brake light, green is passenger side turn, yellow is driver side turn, black is power, and brown is taillights. If these pins are not working, then the fuse for the tow harness circuit is blown. You will need to consult your vehicle owner manual to figure out where this fuse is. There may be a fuse block behind a panel or cover in the driver side foot box and there are probably 1 or 2 more fuse blocks inside the engine bay. Sometimes the back sides of fuse block covers have a diagram of which fuse does what.
If you have power at vehicle connector, but not at the 4-Pole trailer connector, then chances are the trailer caused a short than burned up the Modulite converter instead of letting the signal feed back into your vehicle circuits and do damage there. The way to test is to check to see if signal is coming into the Modulite from the vehicle side and if it is going out of the box on the trailer side. I have included a link to a video showing how to test a Modulite.
Product Page this Question was Asked From
Continue Researching
- Shop: Trailer Wiring
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: Trailer Wiring Harness Installation - 2016 Acura MDX
- Shop: Trailer Hitch
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: Trailer Hitch Installation - 2012 Ford Escape
- Video: Curt T-Connector Vehicle Wiring Harness Installation - 2012 Ford Escape
- Shop: Vehicle Tow Bar Wiring
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: Trailer Wiring Harness Installation - 2008 Acura MDX
- Shop: T-One Vehicle Wiring Harness with 7-Way Trailer Connector
- Video: Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C56192 Review
- Q&A: What Size Thread Tap Would be Needed to Clean Weldnuts for Installing Curt Hitch 13354
- Q&A: Is the Dealer Acura Relay Required to Install Trailer Wiring Harness on a 2014 Acura MDX
- Q&A: Why Does 2016 Acura MDX Call for 20 Amp Fuse But For Curt Trailer Wiring 10 Amp Fuse is Recommended
- Q&A: Is Additional Relay Needed When Installing Curt T-Connector Trailer Harness on 2014 Acura MDX
- Q&A: Fitment and Compatibility of Curt Wiring Harness on 2016 Acura MDX
- Q&A: 2007 Acura Mdx Trailer Light Relay Location
- Video: Choosing the Right Trailer Wiring
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: How to Choose the Right Trailer Hitch Class
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Search Results: hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Search Results: 90160
- Shop: Brake Controller
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams