Locking The Vehicle Without Arming The CTD System
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Locking the vehicle may be accomplished without arming the content theft deterrent (CTD) system by locking the vehicle by using the manual door locks.