Troubleshooting Turn Signal and Brake Lights On ZCI 119250KIT Not Working On 2017 Mercedes-Benz C300
Question:
I installed this on my Mercedes C300. It has a two wire system tail on its own wire, brake/turn on a separate wire. I can get the tail light to work properly, but not turn/brake. This car has LED tail lights with very small wire. It uses two wires for the tail light Pin 1 and2, so I ran both though the sensor and it works fine. The brake/turn line is on Pin 4, and it does not work. Is it possible that the LEDs dont draw enough current to activate this unit? Or am I doing the training wrong? I did 5 seconds each: Lights, brake, right, left. with a couple of seconds in between. Do I need to do each longer? Or with a longer break in between?
asked by: John S
Expert Reply:
There are a few possible causes to why the brake and turn signal functions of the ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT are not working on your 2017 Mercedes Benz C300.
First make sure that the driver and passenger side connectors are installed to the correct wire and that the arrow on the connector is pointing towards the light. Using the included circuit tester while the turn signals are on will allow you to confirm the correct wire.
Next if it is still not working double check that the ground wire on the module is securely connected to bare corrosion free metal.
If the issue is still not resolved then pull the fuse from the power wire to the battery and re-do the learning for the module. To do this you will need to reinsert the fuse, and then turn each function of the harness on for at least 5 seconds (Brake lights, turn signals, head lights to activate tail lights).
This harness works with incandescent or LED lights so your vehicle having LED lights will not be an issue.
If the above troubleshooting steps do not fix the issue, just let me know and we can go into more in-depth troubleshooting.
I included a video of the # 119250KIT being installed in a similar Mercedes-Benz for you to take a look at.
Product Page this Question was Asked From
ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- Universal Fit
- 4 Flat
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Trailer Wiring
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Q&A: Trailer Hitch Recommendation for 2018 VW Tiguan SEL
- Q&A: Will Curt Trailer Hitch C13381 Fit 2018 Volkswagen Tiguan AWD?
- Shop: Towing Kit w/ Ball Mount and Trailer Wiring for Stealth Hitches Hidden Rack Receiver - 2" Ball
- Shop: Stealth Hitches Hidden Rack Receiver - Custom Fit - 2"
- Video: Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118747 Review
- Shop: Trailer Hitch
- Q&A: Trailer Wiring Installation for 2021 Volkswagen Tiguan
- Video: Curt T-Connector Vehicle Wiring Harness Installation - 2021 Volkswagen Tiguan
- Video: Choosing the Right Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Search Results: trailer hitch
- Video: Tow Ready 4-Pole Mounting Bracket Installation
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Video: Choosing the Right Brake Controller
- Q&A: Recommended Hitch for a 2024 Toyota Grand Highlander
- Shop: 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
- Article: My Trailer Hitch Doesn't Fit
- Shop: Brake Controller
- Search Results: 90160
- Search Results: brake controller
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Shop: Gooseneck Hitch
- Video: Stealth Hitches Manufacturer Breakdown
on Custom Fit Vehicle Wiring
