California Code, Business and Professions Code - BPC § 9806

(a) An automobile dealer or manufacturer, licensed pursuant to Chapter 4 (commencing with Section 11700) of Division 5 of the Vehicle Code shall not be required to be registered under this chapter where such dealer or manufacturer installs or replaces an electronic set or automobile burglar alarm as a function related to the sale or repair of a motor vehicle.

(b) No person registered pursuant to Chapter 20.3 (commencing with Section 9880) shall be required to register under this chapter where that person's activities are within the scope of his or her registration and consist of installing an electronic set or automobile burglar alarm system for use in private motor vehicles.