2008 GMC Yukon Owner's Manual - Page 104

Q (Lock): Press Qto lock all the doors. If enabled through the Driver Information Center (DIC), the turn signal lamps will flash once to indicate locking has occurred. If enabled through the DIC, the horn will chirp when the lock button is pressed again within three seconds of the previous press of the lock button. See DIC Vehicle Customization (With DIC Buttons) on page 3-72 for additional information. Pressing Q will arm the content theft-deterrent system. See Content Theft-Deterrent on page 2-22. " (Unlock): Press " to unlock the driver's door. If " is pressed again within three seconds, all remaining doors will unlock. If it is dark enough outside, the interior lamps will come on and stay on for 20 seconds or until the ignition is turned on. If enabled through the DIC, the turn signal lamps will flash twice to indicate unlocking has occurred. See DIC Vehicle Customization (With DIC Buttons) on page 3-72. If enabled through the DIC, the exterior lights will turn on briefly if it is dark enough outside. See "Approach Lighting" under DIC Vehicle Customization (With DIC Buttons) on page 3-72. Pressing " on the RKE transmitter will disarm the content theft-deterrent system. See Content Theft-Deterrent on page 2-22. hold m (Liftglass): For vehicles with a liftglass, press and m to open the liftglass. & (Power Liftgate): For vehicles with a power liftgate, press and hold & to open and close the liftgate. The taillamps will flash and a chime will sound to indicate when the liftgate is opening and closing. L (Vehicle Locator/Panic Alarm): Press and release Lto locate your vehicle. The turn signal lamps will flash and the horn will sound three times. Press and hold Lfor more than two seconds to activate the panic alarm. The turn signal lamps will flash and the horn will sound repeatedly for 30 seconds. The alarm will turn off when the ignition is moved to ON/RUN or Lis pressed again. The ignition must be in LOCK/OFF for the panic alarm to work. 2-6