Well, this is a very brief description of DRL as we know on 2000-2004'*. The ambient light sensor determines daytime/nightime condition, if daytime, the DRL relay is picked up via the Dash Integration Module DIM. The DRL relay places the high beams in series by switching power & ground, each high beam dropping half voltage. When ambient light sensor determines nightime condition DRL relay drops out, high beams turn off. Twilight Sentinel takes over to turn on the lowbeams & rest of exterior lighting. In normal high beam operation, the high beams are paralleled through the high beam relay and have full potential across them. Hope this helped a little. To the best of my knowledge, there are no programmable functions here regarding the DRL, Twilight Sentinel or low beam operation.
2003 SSEi, Light Bronzemist Metallic - All Stock For Now
IBEW Local 261 Groton, CT
My other vehicle is a nuclear submarine.