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    Brake controller install issues

    Well I finally got a new(used reflash) BCM installed. Seemed to fix my issues. I also installed another new brake controller from etrailer and that seems to be work correctly. Thanks to everyone’s help.
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    Brake controller install issues

    First of all, these schematics are incredible! How does one acquire these? After seeing this I would say that’s more than likely the culprit. I’m going to print these off. Leaning towards ordering a new BCM from Highway 71 auto part as there in close in MN… Thank you very much
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    Brake controller install issues

    I doubt the switch is bad but anything is possible, and yes I have 3.9 volts on the blue/white blunt cut wire all the time whether it’s plugged into the brake switch or not…. Only way to get it to go away is to pull the BCM fuse as previously mentioned. I can confirm after driving it just now...
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    Brake controller install issues

    I appreciate your help, if anyone else has ran into this issue of the stoplight wire (blue w/ white stripe) for trailer brake wiring, having a voltage on it when brake pedal was not pushed in, please reach out.
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    Brake controller install issues

    Yeah, that’s what I did, the wires were short because the previous owner cut them short when removing there controller before trading vehicle in. I spliced them in and the blue/white has a voltage when it shouldn’t. I’m leaning towards replacing the BCM or bringing it to a GM dealer to diagnose
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    Brake controller install issues

    Factory I haven’t added anything on this vehicle.
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    Brake controller install issues

    The previous picture I posted was just showing the BCM fuse I pulled to get the 3.9 volts to go away. I have nothing wired into it. The fuse I’m pointing at is the one I pulled to get the voltage to go away.
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    Brake controller install issues

    Here’s how I wired it. These wires were hanging out and had been cut by previous owner and I mounted the my controller in the same holes they had on mounted in
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    Brake controller install issues

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    Brake controller install issues

    Not that I’m seeing
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    Brake controller install issues

    1 other issue is that the reverse lights will sometimes never shut off. I installed the 10 amp fuse for VEH BCK/UP #15 slot and they will sometimes never shut off. My cure for this years ago was to just pull the fuse and I’ve driven it like that for years and not had any issues like a drained...
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    Brake controller install issues

    I should also mention that I hooked up a scan tool and didn’t have any error codes present.
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    Brake controller install issues

    Etrailer is also sending me a different controller but I’d like to get this voltage to go away before trying a new one.
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    Brake controller install issues

    Correct, although I did not check the blue/white before hooking up the controller, but the 3.9 v is present all the time even with the controller unhooked. The only way I can get it to go away is by pulling the BCM fuse. I am pretty sure I hooked the controller up correctly as it’s only 4 wires...
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    Brake controller install issues

    Pic
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    Brake controller install issues

    Update, when I pull the fuse for the BCM behind the panel on drivers side. The 3.9 volts on the blue w/ white stripe goes away… problem with the Body control module possibly?
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    Brake controller install issues

    Hello everyone from SD, been using this site for a few years for advice on my 2007 Yukon XL Denali. I’ve had this vehicle for several years and I’ve decided I wanted a break controller. I went with the prodigy P3 part number 90195 from Etrailer. I have a red with black strip, blue, white and...

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