2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 144

L (Vehicle Locator/Panic Alarm): Press and release to locate the vehicle. The turn signal lamps flash and the horn sounds three times. Programming Transmitters to the Vehicle Only RKE transmitters programmed to this vehicle will work. If a transmitter is lost or stolen, a replacement can be purchased and programmed through your dealer. When the replacement transmitter is programmed to this vehicle, all remaining transmitters must also be reprogrammed. Any lost or stolen transmitters will no longer work once the new transmitter is programmed. Each vehicle can have up to eight transmitters programmed to it. See "Relearn Remote Key" under DIC Operation and Displays (With DIC Buttons) on page 4‑50 or DIC Operation and Displays (Without DIC Buttons) on page 4‑59 for instructions on how to match RKE transmitters to your vehicle. Press and hold L for more than two seconds to activate the panic alarm. The turn signal lamps flash and the horn sounds repeatedly for 30 seconds. The alarm turns off when the ignition is moved to ON/RUN or L is pressed again. The ignition must be in LOCK/OFF for the panic alarm to work. The vehicle comes with two transmitters. Each transmitter will have a number on it, "1" or "2". These numbers correspond to the driver of the vehicle. For example, the memory seat position for driver 1 will be recalled when using the transmitter labeled "1", if enabled through the DIC. See Memory Seat, Mirrors, and Pedals on page 2‑8 and DIC Vehicle Customization (With DIC Buttons) on page 4‑76 for more information. Battery Replacement Replace the battery if the REPLACE BATTERY IN REMOTE KEY message displays in the DIC. See "REPLACE BATTERY IN REMOTE KEY" under DIC Warnings and Messages on page 4‑66 for additional information. Notice: When replacing the battery, do not touch any of the circuitry on the transmitter. Static from your body could damage the transmitter. 3-6