I have the electrical diagrams on CD from Helm. F15 (25 Amp) controls left low beam, F11 (25 Amp) controls right low beam. Each fuse feeds a circuit in the Body Control Module. This circuit is listed as Micro, which means to me to be some electonics package. There are other fuses in the BCM that feed headlamp assemblys, rear lamp assemblies, markers and other lighting. Good luck finding your problem.