I sent an email to Hummer regarding the absence of childproof locks on the H3.
I received the following reply:
"Thank you for contacting HUMMER and for your interest in the HUMMER H3! In section 3 of the Owners Manual there is information that explains the automatic door lock system. The default lock program locks all the doors when the vehicle is taken out of Park and then unlocks the doors once the vehicle is placed back into Park, this is with the automatic tranmission. The manual locks the doors when speeds are greater than 15 mph and then will only unlock when the key is removed from the ignition. The automatic locking system can be programmed according to your needs.
To obtain more information regarding the H3, please visit
www.hummer.com or contact your preferred dealership.
We hope that this information answers your question. If you need additional information or have further questions, please let us know via email or by calling HUMMER at 1-800-732-5493, between 9:00 AM - 9:00 PM Eastern Time, Monday - Friday. Again, thank you for contacting HUMMER!
Sincerely,
Jack Chance
HUMMER
Customer Relationship Manager