And if that doesn't work? I've programmed these fobs a few times and never had a problem until now. The sequence initiates but I hold the lock and unlock down for over a minute on 2 different fobs and I get no response.
To Program a new remote you must get in your vehicle, close all doors hold your unlock button down.while holding the button down turn your key on and off two times.at that time your locks will all cycle.Then with your keyless remote hold your lock and unlock buttons till the locks cycle .
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I would start by replacing the battery in the key fob remote that goes on your keychain. You can take it to most auto part stores and they will test/replace the battery in the device. It's a fairly cheap fix. If the device still isn't working after a new battery, then you will need to replace the fob. Some auto part stores like, AutoZone, will carry some of them but some you need to go to your local GMC dealer.
Seating in the drivers seat , make sure all doors are closed.Insert key into ignition, don't turn on yet. Wait for the dome light to go out, then press and hold the door unlock button , make sure it is UNLOCK, while turning the key ON OFF ON OFF Twice , do not engage the started, just on to the point of being on. Release the unlock button,and your doors should lock, then unlock indicating programming mode.At this point hold down both the lock and unlock button on the key fob. After 30 seconds your locks should lock and unlock, indicating the fob is programmed. This must be repeated for all remotes, whether or not it be new or old. After all remotes are programmed, turn the key off and on again to exit programming mode.
Have your dealership test the remotes for you, they will also use a "Tech-2" to re-program it and should not charge you to do so. "I know mine does not" The "puddle" lamps come on when you un-lock the doors with the remote."If they are enabled in the options on your dash information center or "DIC". "See owners manual for info on that". As far as the DRL's make sure your bulbs are good because they are known to blow out. But the remote should not have anything to do with those.Hope that helps a little?