To change the battery in the key fob transmitter, you should do it when the device fails to open the locks when you are 10 feet away since the range is approximately 30 feet. The first step is to open the door of the driver using the key. A small screwdriver is used to carefully separate the transmitter and the key half and then the halves of the case. Install a new transmitter battery with the orientation of the battery before changing being taken note of. Once the battery is changed, then attach the case halves again and then put the transmitter into the key half and then do the process of synchronizing. In order to have the transmitter programmed, one needs to open the door using the key, press the unlock button of the key fob, stick the key to the ignition lock and switch it to the ON position. Switch off the ignition and remove the key, press on the unlock button on the key fob within 30 seconds. The locking system must react; otherwise, take off the key fob battery and install it once more and begin anew.