How to Install the Prodigy P3 Brake Controller on 2018 BMW X3 with Factory Wiring
Question:
Do you know if this brake controller will support 2018 BMW X3 M40i? My understand is that BMW x3 2018 has pre-wire 4 pin connector ready. Please advise
asked by: Randy P
Expert Reply:
Yes, you can install the Tekonsha Prodigy P3, # 90195, on your 2018 BMW X3 M40i if it is pre-wired with the 4-pin brake controller connector under the dash. In order to do this we will have to completely cut off the factory plug and butt connect the brake controller wires to the factory wires because a plug-in harness does not exist at this time.
Please note, we strongly recommend using a circuit tester like part # PTW2993 to test the functions of each wire before you make any cuts or connections. Vehicle manufacturers have been known to change wire colors during production.
From my research, it looks like the factory wires are as follows:
Brown - Ground
Red - Stoplight Switch
Black - 12 Volt Power
Red/Blue - To Trailer Connector
Most aftermarket brake controllers, including the P3, are going to use the same color code which is as follows:
White - Ground
Red - Stoplight Switch
Black - 12 Volt Power
Blue - To Trailer Connector
I attached a diagram to help. Again, I strongly recommend testing these wires with a circuit tester before you make any final connections. Vehicle manufacturers have been known to change up wire colors during production.
This installation can be performed pretty easily by most auto shops, but if you decide that cutting and splicing wires isn't what you had in mind, then your next best brake controller option in my opinion is the Curt Echo Brake Controller, # C51180 which simply plugs right into your 7-way trailer connector and is operated via the app from your smartphone. I've personally used this brake controller and I really like the "grab-and-go" design. My only gripe about this brake controller is the fact that it can be easily stolen if you leave it unattended while it is plugged in.
I attached a review article and video on this brake controller for you to check out.
Products Referenced in This Question
Curt Echo Wireless Brake Controller - 7-Way Plug Mount w/ Bluetooth App - 1 to 2 Axle - Proportional
- Trailer Brake Controller
- Proportional Controller
- Hidden
- Up to 2 Axles
- Smartphone Display
- CURT
more information >
Product Page this Question was Asked From
Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- LCD Display
- Up to 360 Degrees
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Brake Controller
- Shop: Trailer Hitch
- Shop: Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Shop: Stealth Hitches Hidden Trailer Hitch Receiver w/ Towing Kit - Custom Fit - 2"
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Trailer Wiring
- Shop: Hook Probe Circuit Tester
- Q&A: Wiring Configuration for Tekonsha Prodigy P3 Trailer Brake Controller 90195
- Search Results: 90195
- Article: Brake Controller Installation: Starting from Scratch
- Search Results: brake controller
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Video: Tekonsha Prodigy P3 Trailer Brake Controller Review
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Search Results: redarc mount
- Search Results: 7 pin trailer wiring harness
- Search Results: redarc
- Search Results: trailer brake controller
- Video: Choosing the Right Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: How to Choose the Right Trailer Hitch Class
- Video: Choosing the Right Brake Controller
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: What Hitch Do You Recommend for a 2024 Toyota RAV4?
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Article: My Trailer Hitch Doesn't Fit
- Shop: Roof Rack