Curt Brake Controller Wiring on GX470 Showing Disconnected, Short, & Blank Screen

Published 05/28/2024

Products Featured in This Question

Curt TriFlex NEXT Trailer Brake Controller - 1 to 4 Axles - Proportional

(928)

$135.95

Hopkins Plug-In Simple Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Flat Connectors

(108)

$38.51

Question:

I recently installed this on my GX470 rust free with recommended wiring harness and get a short signal. Checked all the wires and all seems ok. The blue one gives 12 V with the brake pedal pressed and I get 0 ohms from the cab to the connector. Since the short signal goes and I couldnt find anything else I hooked up the trailer and after calibration the brakes seem to work correctly and the error goes away. Disconnect the trailer and the error comes back. So when I start the vehicle it says not connected, then short, then blank screen. Any thoughts on that?

asked by: Dave

Expert Reply:

Hi Dave,

Sorry to hear of the trouble you're having with the Curt TriFlex NEXT Trailer Brake Controller # C24VV, as those are quite a few issues. It's pretty odd to have all of that at one time, but it's pointing to bad wiring to the 7-way on your 2007 Lexus GX470. I think it's very likely a ground issue or damaged brake wire going to the 7-way. That is going to be very difficult to trace but there is wiring going to the 7-way you can take a look at, or go to the dealer and have them examine it if you're having trouble. You can try unplugging your factory 7-way and looking at its connectors and wires as well, and if there is any damage you can replace it with part # HM43374 for an easy fix.

expert reply by: Kyle S