2003 GMC Yukon Owner's Manual - Page 101

Resynchronization Resynchronization may be necessary due to the security method used by this system. The transmitter does not send the same signal twice to the receiver. The receiver will not respond to a signal that has been sent previously. This prevents anyone from recording and playing back the signal from the transmitter. To resynchronize your transmitter, stand close to your vehicle and press and hold the LOCK and UNLOCK buttons on the transmitter at the same time for 15 seconds. The door locks should cycle to confirm synchronization. If the locks do not cycle, see your dealer for service. CAUTION: (Continued) the handle will not open it. You increase the chance of being thrown out of the vehicle in a crash if the doors are not locked. So, wear safety belts properly and lock the doors whenever you drive. Young children who get into unlocked vehicles may be unable to get out. A child can be overcome by extreme heat and can suffer permanent injuries or even death from heat stroke. Always lock your vehicle whenever you leave it. Outsiders can easily enter through an unlocked door when you slow down or stop your vehicle. Locking your doors can help prevent this from happening. • Doors and Locks Door Locks • {CAUTION: Unlocked doors can be dangerous. • Passengers - especially children - can easily open the doors and fall out of a moving vehicle. When a door is locked, CAUTION: (Continued) There are several ways to lock and unlock your vehicle. You can use the keyless entry system (if equipped). You can also use your key. 2-7