Troubleshooting Curt TriFlex Brake Controller Not Showing Activation

Question:

I had the Curt C51140 brake controller with 51522 harness installed on my 2017 Audi Q7. I pickup my trailer Saturday so have not tried hooking up to trailer. When I start the car the decimal point does not come on. Also if I apply the brakes it does not come on. If I slide the manual control lever the decimal point does illuminate. Is this correct or should the decimal point illuminate when the car is started.

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Expert Reply:

On your Curt TriFlex Trailer Brake Controller # C51140, the decimal point as you put it is standby mode with no trailer connected. The blank screen is also standby mode and that screen is what is seen when simply starting the vehicle, but that screen should illuminate when you press the manual override or show the decimal point when you hit the brake pedal only while moving since it is a proportional controller. If it does not operate under those criteria, then you will need to have the installation checked as it would not be receiving power or ground correctly.

I've attached a photo of the manual that shows this.

Click to Enlarge
expert reply by:
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Jason S

Question:

Just took the car for a ride and still doing the same. Decimal point when I slide override over and when driving applied brakes and still no decimal point. I know nothing is a guarantee but I used the adapter to go between the controller and the plug for the brake controller in the car. Shouldn’t that give me good connections and would the decimal light up when I slide the manual override if I had bad connections.

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Expert Reply:

I appreciate you following up. Since you have the wiring harness, it sounds like there is a wiring issue and you will need to check your owners manual. I have looked for fuses and haven't found anything specific for your brake controller but there is a trailer mode they say needs to be selected that may have an impact on the power to your controller. You can test your brake controller itself with a bench test using the attached help article.

Click to Enlarge
expert reply by:
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Jason S

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