Not daytime running lights,...Automatic h/l,...there is no off option on a Chevy Malibu. If I remove the auto H/L relay,...I get a check engine light. I can only substitute a resistor equal to the day time value of the ambient light sensor.

Measure the sensor resistor in daylight using a multimeter.

otherwise, you need the current flow to calculate a resistor

That's the trouble wit Yank tanks. They design them simple, so there isn't anything confusing like a switch for the driver to bother with

Day Time Running Lights ?? Check the owner's manual for the code.

The headlight switch should a selection of OFF next to the AUTO.

I hear ya Marty. This is the dumbest thing to ever come out of Detroit. It makes people relient on sensors and eliminates common sense. More and more cars running around in the fog or blinding snowstorms with headlights off. They do not know how to turn them on anymore and off anymore. Sorry, IDK.

I want to shut off my automatic headlights in my Chevy. It uses a light sensing variable resistor to drop 5. volt dc input, down to 2. volt. How can I calculate the fixed resistor needed to do this ??