I am currently working on this, I've contacted backinblack about it. I have an HID kit I ordered from ebay that I'm trying to put in, so I need the solution to this problem too haha. I've been studying wiring diagrams for our cars, and near as I can tell the BCM controls the DRL automatically. (I haven't checked yet to see if the BCM supplies less than 12 volts to the running lamps , and they seem to be the same brightness as when the headlamps come on. I will check this soon though.) my plan involves wiring a relay into the headlamp circuit using the power feed as an input to a relay, which will provide the headlamp ballasts with 12v directly from the battery. I also plan to wire a switch into the output side of the relay in order to manually open that circuit (to disable the DRL altogether) it is my thought that since there will be a coil from the relay drawing power from the positive side of the headlamp wiring, the BCM will see a complete circuit (even when the DRL's are turned off) and will not register any faults. I will be testing this and will let you know how it turns out. if it works, I can let you know how to do yours.
