2004 Chevrolet Blazer Owner's Manual - Page 75

All doors lock/None of the doors unlock: Press the lock side of the power door lock switch once, and then the unlock side three times. No doors lock/None of the doors unlock: Press the lock side of the power door lock switch twice. This turns off the automatic lock feature. This is the factory setting. For more information, see your dealer. The following instructions detail how to program your door locks. Choose one of the programming options before entering the programming mode. To enter the program mode, do the following: 1. Begin with the ignition in OFF. Then pull the turn signal/multifunction lever all the way toward you and hold it while you perform the next step. 2. Turn your key to RUN and OFF twice. Then, with the key in OFF, release the turn signal/multifunction lever. Once you do this, you will hear the lock switch lock and unlock. 3. You are now ready to program the automatic door locks. Select one of the previous four programming options and follow the instructions. You will have 30 seconds to begin programming. If you exceed the 30 second limit, the locks will automatically lock and unlock to indicate you have left the program mode. If this occurs, repeat the procedure beginning with Step 1. You can exit the program mode any time by turning the ignition to RUN. The locks will automatically lock and unlock to indicate you are leaving the program mode. If the lock/unlock switches are not pressed while in the programming mode, the auto lock/unlock setting will not be modified. 2-9