California Code, Vehicle Code - VEH § 23225

(a)(1) It is unlawful for the registered owner of any motor vehicle to keep in a motor vehicle, when the vehicle is upon any highway or on lands, as described in subdivision (c) of Section 23220, any bottle, can, or other receptacle containing any alcoholic beverage that has been opened, or a seal broken, or the contents of which have been partially removed, unless the container is kept in the trunk of the vehicle.

(2) If the vehicle is not equipped with a trunk and is not an off-highway motor vehicle subject to identification, as defined in Section 38012, the bottle, can, or other receptacle described in paragraph (1) shall be kept in some other area of the vehicle that is not normally occupied by the driver or passengers. For the purposes of this paragraph, a utility compartment or glove compartment shall be deemed to be within the area occupied by the driver and passengers.

(3) If the vehicle is not equipped with a trunk and is an off-highway motor vehicle subject to identification, as defined in subdivision (a) of Section 38012, the bottle, can, or other receptacle described in paragraph (1) shall be kept in a locked container. As used in this paragraph, “locked container” means a secure container that is fully enclosed and locked by a padlock, key lock, combination lock, or similar locking device.