I have a 2012 MDX, actually my wife's car. One Driving Light works and one doesn't. The DRL warning light is on. The bulb has been replaced, but still doesn't work. When the Lights are On, both are lit. But when she drive in the Auto position only one light is on. Obviously, it's not a fuse. So, is there an easy way to trouble shoot this? Or do I just have to start checking the continuity of the wires, which sounds hideous.