This is the thread, however I don't think it will help you as this was for a car without OEM DRLs.
This is what I had in mind. Simple and cheap, but it would depend upon the power supplied by the OEM DRLs.
That +Battery should be supplied via a switched power source that is on with the ignition.
If the OEM DRL power supply is too high, it would activate the solenoid and it wouldn't work. However, I think the power would be low enough for it to work. An easy way to find out would be to tap the low beam positive power supply in the connector, and hook it up to the relay solenoid(don't forget to ground the other end of the solenoid), turn ignition on to power the OEM DRL circuit, and see if it throws the solenoid. If not, great! Then switch on headlights and make sure that the solenoid
is activated, breaking the circuit.
Since I don't have OEM DRLs, you'd have to do the legwork here
