SECURITY LIGHT NOT FLASHING WHEN VEHICLE IS LOCKED 07 GMC YUKON DENALI

Try this: Relearn Remote Key This display allows you to match remote keyless entry transmitters to your vehicle. To match a remote keyless entry transmitter to your vehicle, do the following: 1. Press the vehicle information button until PRESS V TO RELEARN REMOTE KEY displays. 2. Press the set/reset button until REMOTE KEY LEARNING ACTIVE is displayed. 3. Press and hold the lock and unlock buttons on the first transmitter at the same time for approximately 15 seconds. A chime will sound indicating that the transmitter is matched. 4. To match additional transmitters at this time, repeat Step 3. Each vehicle can have a maximum of eight transmitters matched to it. 5. To exit the programming mode, you must cycle the key to LOCK. Page - 250 in owners manual.