2003 Chevrolet Blazer Owner's Manual - Page 76

If your vehicle has an automatic transmission it will be programmed to have all the doors lock automatically when the shift lever is moved out of PARK (P). All the doors will unlock when the shift lever is moved back into PARK (P). On a manual transmission, all doors will lock when the vehicle speed is greater than 15 mph (24 km/h). The doors will unlock when the key is removed from the ignition. The following instructions detail how to program your door locks. Choose oneof 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 signaVmultifunction 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 Iock/unIock switches are not pressed while in the programming mode, the auto IocWunlock setting will not be modified. 2-9