Does the car have daytime running lights?
What lights come on, high beams, low beams, both?
You state the car does not have auto headlights, what about auto off?
The headlight relay is in a plastic box, engine compartment. If the car does not have auto headlights or auto off, the relay should only be powered when the light control switch inside the car turned them on.
When the lights come on, remove the relay and determine if they go off. It's in a plastic box, left side engine compartment marked HEAD.
Keep in mind the system works by grounding wires from the relay and light bulbs.