CALIFORNIA LAW ON LOG 300
As of the start of 2016, the California Occupation Health & Safety Standards Board has not approved of the changes to the recordkeeping guidelines. This process can take up to six months, essentially pushing the compliance date to January 1, 2017.
In summary, auto dealers in California are currently exempt from Log 300 requirements. See https://www.dir.ca.gov/dosh/DoshReg/FinalEmpRec.html. Cal/OSHA has inspected dealers for regulatory violations and has not requested to see the Log 300 as they are exempt per state regulations.