Cruise control turns off when headlights turned on

Discussion in 'General Motoring' started by Sara, Apr 4, 2007.

  1. Sara

    Sara Guest

    My husband just added a trailer hitch to our 2007 Odyssey and did some
    wiring to plug in the trailer lights when needed. Now the cruise
    control cannot be set unless the headlights are turned off! I can see
    that the cruise control is powered up. I turn off the headlights,
    then cruise control works normally, turn on headlights, and speed
    setting is cancelled. Guess I need to buy a manual with schematics,
    but does anyone know if these things are related?
    Sara, Apr 4, 2007
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  2. Sara

    Seth Guest

    Somewhere in the trailer harness he's getting "feedback" from the trailer
    lights through the ground line for the brakes. With the headlights on, that
    closing of the ground line is looking to the car like your foot is on the
    brakes thus cancelling the cruise control.

    I would first suspect he used an improper aftermarket trailer harness that
    lacks the proper isolation.
    Seth, Apr 4, 2007
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  3. Sara

    motsco_ Guest


    I think Seth described it perfectly. He should have installed a module
    that 'adapts' the Honda connector to work with whatever style of trailer
    you use.

    Look through these threads and follow any links provided. You can also
    sign in and _SEARCH_. No need to ask, the answers are already there.

    motsco_, Apr 4, 2007
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