How To Find Stop Light Switch Wire For Trailer Brake Controller In 2015 Lexus RX 350
Updated 06/29/2021 | Published 06/23/2021
Question:
Where can I find an easily accessible stop light wire? It is equipped with a factory trailer package.
asked by: Chris B
Expert Reply:
The cold side of the stop light switch wire which a trailer brake controller gets connected to will be on the stop light switch itself.
You will want to start at the brake pedal of your 2015 Lexus RX 350 and work up towards the firewall. The switch will be touching the brake pedal arm or have a wire running to the pedal arm.
Once you have found the switch you will need to use a circuit tester like # PTW2993 to test each wire. The correct wire only has power when the brake pedal is pressed. When we installed the Tekonsha Prodigy P3 # 90195 in a similar 2013 Lexus RX 350 we found that the cold side wire was the yellow wire as you can see at the 19:00 minute mark of the included video.
I included a video of the # 90195 for you to take a look at.
Featured Help Information
Miscellaneous Media
Continue Researching
- Q&A: Trailer Wiring for 2014 Lexus RX350 Without Factory Tow Package
- Search Results: duplex wire
- Article: Trailer Wiring Diagrams
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Brake Controller Installation: Starting from Scratch
- Shop: 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires
- Shop: Trailer Wiring
- Shop: Brake Controller
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Redarc Tow-Pro Liberty Brake Controller w/ Custom Harness - Dash Knob - Up to 2 Axles - Proportional
- Shop: Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
- Shop: 12 Gauge 2 Conductor Jacketed (Brake) Wire Per Foot
- Shop: Trailer Hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: How to Choose a Trailer Brake Controller
- Search Results: trailer wiring
- Search Results: trailer hitch
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: Clean Up Your Trailer Wiring
- Video: Curt Mounting Bracket for 4-Pole Flat Trailer Connector Review
- Search Results: trailer brake controller
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Recommended 4-Way Wiring for a 2017 Lexus RX 350 w/out the Tow Package and Where to Put the Ground
- Shop: Redarc Tow-Pro Liberty Brake Controller w/ Universal Wiring Harness - Dash Knob - Proportional
- Video: Feature Breakdown: Universal Installation Kit for Trailer Brake Controller
- Shop: Roof Rack
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Search Results: brake controller
- Video: What to Know About the Curt TriFlex NEXT Trailer Brake Controller
on Trailer Brake Controller
