I own a 2001 Silverado and my daytime running lights do not work. My headlights are always on whenever I turn the ignition key on. I have to push the override button 4 times to shut the headlights off during the daylight hours. I have checked under the relay for DRL and found pin 30 to have 12 volts of power but when I do the ground reference check on pin 85 with the probe light touching the inside socket and the alligator clip of the test light on a power source(directly on positive battery post) I get nothing. Can you please give me directions to go from here? I watched your video and that was for an older truck chevrolet truck than mine. I dont have the under the dash diode assembly module. Please help me to troubleshoot this issue. Thanks so much, Rick S.