2003 Hummer H2 Owner's Manual - Page 95

(Lock): Pressing this button once will lock all of the doors. Pressing the button again within three seconds may cause the horn to chirp to confirm that the doors have locked. You can choose different feedback options for each press of the lock button, such as having the vehicle's perimeter lamps flash and/or have the horn chirp. See "Driver Information Center (DIC)" in the Index for more information. (Panic): When the button with the horn symbol on the key transmitter is pressed, the horn will sound and the headlamps and taillamps will flash for up to 30 seconds. This can be turned off by pressing the horn button again, or by waiting for 30 seconds, or by starting the vehicle. Matching Transmitter(s) to Your Vehicle Each remote keyless entry transmitter is coded to prevent another transmitter from unlocking your vehicle. If a transmitter is lost or stolen, a replacement can be purchased through your dealer. Remember to bring any remaining transmitters with you when you go to your dealer. When the dealer matches the replacement transmitter to your vehicle, any remaining transmitters must also be matched. Once your dealer has coded the new transmitter, the lost transmitter will not unlock your vehicle. Each vehicle can have a maximum of four transmitters matched to it. 2-13