How to turn off the GM Passlock anti-theft system on a Hummer H3? Hummer Forums - Enthusiast Forum for Hummer Owners Hummer Lineup Hummer H3 How to turn off the GM Passlock anti-theft system on a Hummer H3? Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine