A lighting system for exterior lights of an automobile comprises a first lighting unit primarily for outputting a first automotive light signal and a failure detection system for detecting a failure of the first lighting unit. A method for making the modifier of the lithium ion battery. A lag can be created in the etch, such that the etch rate is slower near the sidewall. The snap connection has a spring snap-connected to the holding part, wherein the spring has a coupling member and the mirror base is fixedly connected to the coupling member in a mounted position of the mirror base.