Turning On Headlights Disables Cruise Control

[fdunford]

Any ideas how/why their connected?

[bulrid8]

Check for burned out tail,brake or turn signal bulbs. Your cruise is connected through the brake light circuit.

[fdunford]

All lights work, but I did find that when I turn on the headlights the brake lights activate w/o pressing on the pedal. That explains why the cruise is shutting off.

Now I need to figure out why the brake lights are coming on w/o an input. Any ideas?

[CnlK]

Sure seems like you have continuity between the two circuits, will your headlights illuminate when you hit the brake? A bad ground can also cause some strange things.

[mundy5]

sounds like the brake sensor in your pedal is failing or some circuitry in there is shorted out causing the car to think that your brake pedal is depressed; hence your brake lights turn on. surprised it doesn't do it even during the day. check the brake sensor on your pedal.